{"id":1637,"date":"2022-11-22T19:01:33","date_gmt":"2022-11-22T11:01:33","guid":{"rendered":"https:\/\/qaqaq.top\/?p=1637"},"modified":"2022-11-27T12:40:57","modified_gmt":"2022-11-27T04:40:57","slug":"1637","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=1637","title":{"rendered":"\u8303\u5f0f\u6982\u8ff0\u4e0e\u7b2c\u4e00\u8303\u5f0f\u3001\u7b2c\u4e8c\u8303\u5f0f\u4e0e\u7b2c\u4e09\u8303\u5f0f\u3001\u53cd\u8303\u5f0f\u5316\u7684\u5e94\u7528\u3001\u5df4\u65af\u8303\u5f0f\u3001\u7b2c\u56db\u8303\u5f0f\u3001\u7b2c\u4e94\u8303\u5f0f\u548c\u57df\u952e\u8303\u5f0f\u3001\u8303\u5f0f\u7684\u5b9e\u6218\u6848\u4f8b\u3001ER\u5efa\u6a21\u4e0e\u8f6c\u6362\u6570\u636e\u8868\u7684\u8fc7\u7a0b\u3001\u6570\u636e\u5e93\u7684\u8bbe\u8ba1\u539f\u5219\u548c\u65e5\u5e38SQL\u7f16\u5199\u89c4\u8303\u3001PowerDesigner\u521b\u5efa\u6982\u5ff5\u3001\u7269\u7406\u6570\u636e\u6a21\u578b"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code># \u7b2c11\u7ae0_\u6570\u636e\u5e93\u7684\u8bbe\u8ba1\u89c4\u8303\r\n\r\n#07-\u6570\u636e\u8868\u7684\u8bbe\u8ba1\u89c4\u8303\r\n\r\n# 2. \u8303 \u5f0f\r\n\r\n# 2.1 \u8303\u5f0f\u7b80\u4ecb\r\n# \u5728\u5173\u7cfb\u578b\u6570\u636e\u5e93\u4e2d\uff0c\u5173\u4e8e\u6570\u636e\u8868\u8bbe\u8ba1\u7684\u57fa\u672c\u539f\u5219\u3001\u89c4\u5219\u5c31\u79f0\u4e3a\u8303\u5f0f\u3002\r\n# \u53ef\u4ee5\u7406\u89e3\u4e3a\uff0c\u4e00\u5f20\u6570\u636e\u8868\u7684\u8bbe\u8ba1\u7ed3\u6784\u9700\u8981\u6ee1\u8db3\u7684\u67d0\u79cd\u8bbe\u8ba1\u6807\u51c6\u7684 \u7ea7\u522b \u3002\r\n# \u8981\u60f3\u8bbe\u8ba1\u4e00\u4e2a\u7ed3\u6784\u5408\u7406\u7684\u5173\u7cfb\u578b\u6570\u636e\u5e93\uff0c\u5fc5\u987b\u6ee1\u8db3\u4e00\u5b9a\u7684\u8303\u5f0f\u3002\r\n\r\n# 2.2 \u8303\u5f0f\u90fd\u5305\u62ec\u54ea\u4e9b\r\n# \u76ee\u524d\u5173\u7cfb\u578b\u6570\u636e\u5e93\u6709\u516d\u79cd\u5e38\u89c1\u8303\u5f0f\uff0c\u6309\u7167\u8303\u5f0f\u7ea7\u522b\uff0c\u4ece\u4f4e\u5230\u9ad8\u5206\u522b\u662f\uff1a\r\n# \u7b2c\u4e00\u8303\u5f0f\uff081NF\uff09\u3001\u7b2c\u4e8c\u8303\u5f0f\uff082NF\uff09\u3001\u7b2c\u4e09\u8303\u5f0f\uff083NF\uff09\u3001\u5df4\u65af-\u79d1\u5fb7\u8303\u5f0f\uff08BCNF\uff09\u3001\r\n# \u7b2c\u56db\u8303\u5f0f(4NF\uff09\u548c\u7b2c\u4e94\u8303\u5f0f\uff085NF\uff0c\u53c8\u79f0\u5b8c\u7f8e\u8303\u5f0f\uff09\u3002\r\n\r\n# 2.4 \u7b2c\u4e00\u8303\u5f0f(1st NF)\r\n\r\n# 2.5 \u7b2c\u4e8c\u8303\u5f0f(2nd NF)\r\n#\u975e\u4e3b\u5c5e\u6027\u90fd\u5b8c\u5168\u4f9d\u8d56\u4e0e\u4e3b\u952e\r\n\r\n# 1NF \u544a\u8bc9\u6211\u4eec\u5b57\u6bb5\u5c5e\u6027\u9700\u8981\u662f\u539f\u5b50\u6027\u7684\uff0c\u800c 2NF \u544a\u8bc9\u6211\u4eec\u4e00\u5f20\u8868\u5c31\u662f\u4e00\u4e2a\u72ec\u7acb\u7684\u5bf9\u8c61\uff0c\u4e00\u5f20\u8868\u53ea\u8868\u8fbe\u4e00\u4e2a\u610f\u601d\u3002\r\n\r\n# 2.6 \u7b2c\u4e09\u8303\u5f0f(3rd NF)\r\n#\u975e\u4e3b\u5c5e\u6027\u90fd\u4e0d\u4f20\u9012\u4f9d\u8d56\u4e0e\u4e3b\u952e\r\n\r\n# \u7b26\u54083NF\u540e\u7684\u6570\u636e\u6a21\u578b\u901a\u4fd7\u5730\u8bb2\uff0c2NF\u548c3NF\u901a\u5e38\u4ee5\u8fd9\u53e5\u8bdd\u6982\u62ec\uff1a\u201c\u6bcf\u4e2a\u975e\u952e\u5c5e\u6027\u4f9d\u8d56\u4e8e\u952e\uff0c\u4f9d\u8d56\u4e8e\u6574\u4e2a\u952e\uff0c\u5e76\u4e14\u9664\u4e86\u952e\u522b\u65e0\u4ed6\u7269\u201d\u3002\r\n\r\n# 3. \u53cd\u8303\u5f0f\u5316\r\n\r\n# 3.1 \u6982\u8ff0\r\n\r\n# \u89c4\u8303\u5316 vs \u6027\u80fd\r\n# 1. \u4e3a\u6ee1\u8db3\u67d0\u79cd\u5546\u4e1a\u76ee\u6807 , \u6570\u636e\u5e93\u6027\u80fd\u6bd4\u89c4\u8303\u5316\u6570\u636e\u5e93\u66f4\u91cd\u8981\r\n# 2. \u5728\u6570\u636e\u89c4\u8303\u5316\u7684\u540c\u65f6 , \u8981\u7efc\u5408\u8003\u8651\u6570\u636e\u5e93\u7684\u6027\u80fd\r\n# 3. \u901a\u8fc7\u5728\u7ed9\u5b9a\u7684\u8868\u4e2d\u6dfb\u52a0\u989d\u5916\u7684\u5b57\u6bb5\uff0c\u4ee5\u5927\u91cf\u51cf\u5c11\u9700\u8981\u4ece\u4e2d\u641c\u7d22\u4fe1\u606f\u6240\u9700\u7684\u65f6\u95f4\r\n# 4. \u901a\u8fc7\u5728\u7ed9\u5b9a\u7684\u8868\u4e2d\u63d2\u5165\u8ba1\u7b97\u5217\uff0c\u4ee5\u65b9\u4fbf\u67e5\u8be2\r\n\r\n# 3.2 \u5e94\u7528\u4e3e\u4f8b\r\n\r\n#\u53cd\u8303\u5f0f\u5316\u7684\u4e3e\u4f8b\uff1a\r\n\r\nCREATE DATABASE atguigudb3;\r\n\r\nUSE atguigudb3;\r\n\r\n#\u5b66\u751f\u8868\r\nCREATE TABLE student(\r\n    stu_id INT PRIMARY KEY AUTO_INCREMENT,\r\n    stu_name VARCHAR(25),\r\n    create_time DATETIME\r\n);\r\n\r\n#\u8bfe\u7a0b\u8bc4\u8bba\u8868\r\nCREATE TABLE class_comment(\r\n    comment_id INT PRIMARY KEY AUTO_INCREMENT,\r\n    class_id INT,\r\n    comment_text VARCHAR(35),\r\n    comment_time DATETIME,\r\n    stu_id INT\r\n);\r\n\r\n#\u521b\u5efa\u5411\u5b66\u751f\u8868\u4e2d\u6dfb\u52a0\u6570\u636e\u7684\u5b58\u50a8\u8fc7\u7a0b\r\nDELIMITER \/\/\r\n\r\nCREATE PROCEDURE batch_insert_student(IN START INT(10), IN max_num INT(10))\r\nBEGIN\r\n    DECLARE i INT DEFAULT 0;\r\n    DECLARE date_start DATETIME DEFAULT ('2017-01-01 00:00:00');\r\n    DECLARE date_temp DATETIME;\r\n    SET date_temp = date_start;\r\n    SET autocommit=0;\r\n    REPEAT\r\n        SET i=i+1;\r\n        SET date_temp = DATE_ADD(date_temp, INTERVAL RAND()*60 SECOND);\r\n        INSERT INTO student(stu_id, stu_name, create_time)\r\n        VALUES((START+i), CONCAT('stu_',i), date_temp);\r\n        UNTIL i = max_num\r\n    END REPEAT;\r\n    COMMIT;\r\nEND \/\/\r\n\r\nDELIMITER ;\r\n\r\n#\u8c03\u7528\u5b58\u50a8\u8fc7\u7a0b\uff0c\u5b66\u751fid\u4ece10001\u5f00\u59cb\uff0c\u6dfb\u52a01000000\u6570\u636e\r\nCALL batch_insert_student(10000,1000000);\r\n\r\n####\u521b\u5efa\u5411\u8bfe\u7a0b\u8bc4\u8bba\u8868\u4e2d\u6dfb\u52a0\u6570\u636e\u7684\u5b58\u50a8\u8fc7\u7a0b\r\nDELIMITER \/\/\r\n\r\nCREATE PROCEDURE batch_insert_class_comments(IN START INT(10), IN max_num INT(10))\r\nBEGIN\r\n    DECLARE i INT DEFAULT 0;\r\n    DECLARE date_start DATETIME DEFAULT ('2018-01-01 00:00:00');\r\n    DECLARE date_temp DATETIME;\r\n    DECLARE comment_text VARCHAR(25);\r\n    DECLARE stu_id INT;\r\n    SET date_temp = date_start;\r\n    SET autocommit=0;\r\n    REPEAT\r\n        SET i=i+1;\r\n        SET date_temp = DATE_ADD(date_temp, INTERVAL RAND()*60 SECOND);\r\n        SET comment_text = SUBSTR(MD5(RAND()),1, 20);\r\n        SET stu_id = FLOOR(RAND()*1000000);\r\n        INSERT INTO class_comment(comment_id, class_id, comment_text, comment_time, stu_id)\r\n        VALUES((START+i), 10001, comment_text, date_temp, stu_id);\r\n        UNTIL i = max_num\r\n    END REPEAT;\r\n    COMMIT;\r\nEND \/\/\r\n\r\nDELIMITER ;\r\n\r\n#\u6dfb\u52a0\u6570\u636e\u7684\u5b58\u50a8\u8fc7\u7a0b\u7684\u8c03\u7528\uff0c\u4e00\u51711000000\u6761\u8bb0\u5f55\r\nCALL batch_insert_class_comments(10000,1000000);\r\n\r\n#\r\nSELECT COUNT(*) FROM student;\r\n\r\nSELECT COUNT(*) FROM class_comment;\r\n\r\n#\u9700\u6c42\r\nSELECT p.comment_text, p.comment_time, stu.stu_name\r\nFROM class_comment AS p LEFT JOIN student AS stu\r\nON p.stu_id = stu.stu_id\r\nWHERE p.class_id = 10001\r\nORDER BY p.comment_id DESC\r\nLIMIT 10000;                    #106 ms\r\n\r\n#\u8fdb\u884c\u53cd\u8303\u5f0f\u5316\u7684\u8bbe\u8ba1\r\n#\u8868\u7684\u590d\u5236\r\nCREATE TABLE class_comment1\r\nAS\r\nSELECT * FROM class_comment;\r\n\r\n#\u6dfb\u52a0\u4e3b\u952e\uff0c\u4fdd\u8bc1class_comment1 \u4e0eclass_comment\u7684\u7ed3\u6784\u76f8\u540c\r\nALTER TABLE class_comment1\r\nADD PRIMARY KEY (comment_id);\r\n\r\nSHOW INDEX FROM class_comment1;\r\n\r\n#\u5411\u8bfe\u7a0b\u8bc4\u8bba\u8868\u4e2d\u589e\u52a0stu_name\u5b57\u6bb5\r\nALTER TABLE class_comment1\r\nADD stu_name VARCHAR(25);\r\n\r\n#\u7ed9\u65b0\u6dfb\u52a0\u7684\u5b57\u6bb5\u8d4b\u503c\r\nUPDATE class_comment1 c\r\nSET stu_name = (\r\nSELECT stu_name\r\nFROM student s\r\nWHERE c.stu_id = s.stu_id\r\n);\r\n\r\n#\u67e5\u8be2\u540c\u6837\u7684\u9700\u6c42\r\nSELECT comment_text, comment_time, stu_name\r\nFROM class_comment1\r\nWHERE class_id = 10001\r\nORDER BY comment_id DESC\r\nLIMIT 10000;                    #52 ms\r\n\r\n# 3.3 \u53cd\u8303\u5f0f\u7684\u65b0\u95ee\u9898\r\n\r\n# \u5b58\u50a8\u7a7a\u95f4\u53d8\u5927\u4e86\r\n\r\n# \u4e00\u4e2a\u8868\u4e2d\u5b57\u6bb5\u505a\u4e86\u4fee\u6539\uff0c\u53e6\u4e00\u4e2a\u8868\u4e2d\u5197\u4f59\u7684\u5b57\u6bb5\u4e5f\u9700\u8981\u505a\u540c\u6b65\u4fee\u6539\uff0c\u5426\u5219\u6570\u636e\u4e0d\u4e00\u81f4\r\n\r\n# \u82e5\u91c7\u7528\u5b58\u50a8\u8fc7\u7a0b\u6765\u652f\u6301\u6570\u636e\u7684\u66f4\u65b0\u3001\u5220\u9664\u7b49\u989d\u5916\u64cd\u4f5c\uff0c\u5982\u679c\u66f4\u65b0\u9891\u7e41\uff0c\u4f1a\u975e\u5e38\u6d88\u8017\u7cfb\u7edf\u8d44\u6e90\r\n\r\n# \u5728\u6570\u636e\u91cf\u5c0f\u7684\u60c5\u51b5\u4e0b\uff0c\u53cd\u8303\u5f0f\u4e0d\u80fd\u4f53\u73b0\u6027\u80fd\u7684\u4f18\u52bf\uff0c\u53ef\u80fd\u8fd8\u4f1a\u8ba9\u6570\u636e\u5e93\u7684\u8bbe\u8ba1\u66f4\u52a0\u590d\u6742\r\n\r\n# 3.4 \u53cd\u8303\u5f0f\u7684\u9002\u7528\u573a\u666f\r\n\r\n# \u5f53\u5197\u4f59\u4fe1\u606f\u6709\u4ef7\u503c\u6216\u8005\u80fd\u5927\u5e45\u5ea6\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\u7684\u65f6\u5019\uff0c\u6211\u4eec\u624d\u4f1a\u91c7\u53d6\u53cd\u8303\u5f0f\u7684\u4f18\u5316\u3002\r\n\r\n# 1. \u589e\u52a0\u5197\u4f59\u5b57\u6bb5\u7684\u5efa\u8bae\r\n# 1\uff09\u8fd9\u4e2a\u5197\u4f59\u5b57\u6bb5\u4e0d\u9700\u8981\u7ecf\u5e38\u8fdb\u884c\u4fee\u6539\r\n# 2\uff09\u8fd9\u4e2a\u5197\u4f59\u5b57\u6bb5\u67e5\u8be2\u7684\u65f6\u5019\u4e0d\u53ef\u6216\u7f3a\r\n\r\n# 2. \u5386\u53f2\u5feb\u7167\u3001\u5386\u53f2\u6570\u636e\u7684\u9700\u8981\r\n# \u5728\u73b0\u5b9e\u751f\u6d3b\u4e2d\uff0c\u6211\u4eec\u7ecf\u5e38\u9700\u8981\u4e00\u4e9b\u5197\u4f59\u4fe1\u606f\uff0c\u6bd4\u5982\u8ba2\u5355\u4e2d\u7684\u6536\u8d27\u4eba\u4fe1\u606f\uff0c\u5305\u62ec\u59d3\u540d\u3001\u7535\u8bdd\u548c\u5730\u5740\u7b49\u3002\r\n# \u6bcf\u6b21\u53d1\u751f\u7684\u8ba2\u5355\u6536\u8d27\u4fe1\u606f\u90fd\u5c5e\u4e8e\u5386\u53f2\u5feb\u7167\uff0c\u9700\u8981\u8fdb\u884c\u4fdd\u5b58\uff0c\u4f46\u7528\u6237\u53ef\u4ee5\u968f\u65f6\u4fee\u6539\u81ea\u5df1\u7684\u4fe1\u606f\uff0c\r\n# \u8fd9\u65f6\u4fdd\u5b58\u8fd9\u4e9b\u5197\u4f59\u4fe1\u606f\u662f\u975e\u5e38\u6709\u5fc5\u8981\u7684\u3002\r\n\r\n# \u53cd\u8303\u5f0f\u4f18\u5316\u4e5f\u5e38\u7528\u5728\u6570\u636e\u4ed3\u5e93\u7684\u8bbe\u8ba1\u4e2d\uff0c\u56e0\u4e3a\u6570\u636e\u4ed3\u5e93\u901a\u5e38\u5b58\u50a8\u5386\u53f2\u6570\u636e\uff0c\u5bf9\u589e\u5220\u6539\u7684\u5b9e\u65f6\u6027\u8981\u6c42\u4e0d\u5f3a\uff0c\r\n# \u5bf9\u5386\u53f2\u6570\u636e\u7684\u5206\u6790\u9700\u6c42\u5f3a\u3002\u8fd9\u65f6\u9002\u5f53\u5141\u8bb8\u6570\u636e\u7684\u5197\u4f59\u5ea6\uff0c\u66f4\u65b9\u4fbf\u8fdb\u884c\u6570\u636e\u5206\u6790\u3002\r\n\r\n# 4. BCNF(\u5df4\u65af\u8303\u5f0f)\r\n\r\n# 5. \u7b2c\u56db\u8303\u5f0f\r\n\r\n# 6. \u7b2c\u4e94\u8303\u5f0f\u3001\u57df\u952e\u8303\u5f0f\r\n\r\n# 7. \u5b9e\u6218\u6848\u4f8b\r\n\r\n# 8. ER\u6a21\u578b\r\n\r\n# 8.1 ER\u6a21\u578b\u5305\u62ec\u54ea\u4e9b\u8981\u7d20\uff1f\r\n\r\n# ER \u6a21\u578b\u4e2d\u6709\u4e09\u4e2a\u8981\u7d20\uff0c\u5206\u522b\u662f\u5b9e\u4f53\u3001\u5c5e\u6027\u548c\u5173\u7cfb\u3002\r\n\r\n# \u5b9e\u4f53 \uff0c\u53ef\u4ee5\u770b\u505a\u662f\u6570\u636e\u5bf9\u8c61\uff0c\u5f80\u5f80\u5bf9\u5e94\u4e8e\u73b0\u5b9e\u751f\u6d3b\u4e2d\u7684\u771f\u5b9e\u5b58\u5728\u7684\u4e2a\u4f53\u3002\u5728 ER \u6a21\u578b\u4e2d\uff0c\u7528 \u77e9\u5f62 \u6765\u8868\u793a\u3002\r\n# \u5b9e\u4f53\u5206\u4e3a\u4e24\u7c7b\uff0c\u5206\u522b\u662f \u5f3a\u5b9e\u4f53 \u548c \u5f31\u5b9e\u4f53 \u3002\u5f3a\u5b9e\u4f53\u662f\u6307\u4e0d\u4f9d\u8d56\u4e8e\u5176\u4ed6\u5b9e\u4f53\u7684\u5b9e\u4f53\uff1b\r\n# \u5f31\u5b9e\u4f53\u662f\u6307\u5bf9\u53e6\u4e00\u4e2a\u5b9e\u4f53\u6709\u5f88\u5f3a\u7684\u4f9d\u8d56\u5173\u7cfb\u7684\u5b9e\u4f53\u3002\r\n\r\n# \u5c5e\u6027 \uff0c\u5219\u662f\u6307\u5b9e\u4f53\u7684\u7279\u6027\u3002\u6bd4\u5982\u8d85\u5e02\u7684\u5730\u5740\u3001\u8054\u7cfb\u7535\u8bdd\u3001\u5458\u5de5\u6570\u7b49\u3002\u5728 ER \u6a21\u578b\u4e2d\u7528 \u692d\u5706\u5f62 \u6765\u8868\u793a\u3002\r\n\r\n# \u5173\u7cfb \uff0c\u5219\u662f\u6307\u5b9e\u4f53\u4e4b\u95f4\u7684\u8054\u7cfb\u3002\u6bd4\u5982\u8d85\u5e02\u628a\u5546\u54c1\u5356\u7ed9\u987e\u5ba2\uff0c\u5c31\u662f\u4e00\u79cd\u8d85\u5e02\u4e0e\u987e\u5ba2\u4e4b\u95f4\u7684\u8054\u7cfb\u3002\r\n# \u5728 ER \u6a21\u578b\u4e2d\u7528 \u83f1\u5f62 \u6765\u8868\u793a\u3002\r\n\r\n# \u6ce8\u610f\uff1a\u5b9e\u4f53\u548c\u5c5e\u6027\u4e0d\u5bb9\u6613\u533a\u5206\u3002\u8fd9\u91cc\u63d0\u4f9b\u4e00\u4e2a\u539f\u5219\uff1a\u6211\u4eec\u8981\u4ece\u7cfb\u7edf\u6574\u4f53\u7684\u89d2\u5ea6\u51fa\u53d1\u53bb\u770b\uff0c\u53ef\u4ee5\u72ec\u7acb\u5b58\u5728\u7684\u662f\u5b9e\u4f53\uff0c\r\n# \u4e0d\u53ef\u518d\u5206\u7684\u662f\u5c5e\u6027\u3002\u4e5f\u5c31\u662f\u8bf4\uff0c\u5c5e\u6027\u4e0d\u80fd\u5305\u542b\u5176\u4ed6\u5c5e\u6027\u3002\r\n\r\n# 8.2 \u5173\u7cfb\u7684\u7c7b\u578b\r\n\r\n# \u5728 ER \u6a21\u578b\u7684 3 \u4e2a\u8981\u7d20\u4e2d\uff0c\u5173\u7cfb\u53c8\u53ef\u4ee5\u5206\u4e3a 3 \u79cd\u7c7b\u578b\uff0c\u5206\u522b\u662f \u4e00\u5bf9\u4e00\u3001\u4e00\u5bf9\u591a\u3001\u591a\u5bf9\u591a\u3002\r\n\r\n# \u4e00\u5bf9\u4e00 \uff1a\u6307\u5b9e\u4f53\u4e4b\u95f4\u7684\u5173\u7cfb\u662f\u4e00\u4e00\u5bf9\u5e94\u7684\uff0c\u6bd4\u5982\u4e2a\u4eba\u4e0e\u8eab\u4efd\u8bc1\u4fe1\u606f\u4e4b\u95f4\u7684\u5173\u7cfb\u5c31\u662f\u4e00\u5bf9\u4e00\u7684\u5173\u7cfb\u3002\r\n# \u4e00\u4e2a\u4eba\u53ea\u80fd\u6709\u4e00\u4e2a\u8eab\u4efd\u8bc1\u4fe1\u606f\uff0c\u4e00\u4e2a\u8eab\u4efd\u8bc1\u4fe1\u606f\u4e5f\u53ea\u5c5e\u4e8e\u4e00\u4e2a\u4eba\u3002\r\n\r\n# \u4e00\u5bf9\u591a \uff1a\u6307\u4e00\u8fb9\u7684\u5b9e\u4f53\u901a\u8fc7\u5173\u7cfb\uff0c\u53ef\u4ee5\u5bf9\u5e94\u591a\u4e2a\u53e6\u5916\u4e00\u8fb9\u7684\u5b9e\u4f53\u3002\r\n# \u76f8\u53cd\uff0c\u53e6\u5916\u4e00\u8fb9\u7684\u5b9e\u4f53\u901a\u8fc7\u8fd9\u4e2a\u5173\u7cfb\uff0c\u5219\u53ea\u80fd\u5bf9\u5e94\u552f\u4e00\u7684\u4e00\u8fb9\u7684\u5b9e\u4f53\u3002\r\n# \u6bd4\u5982\u8bf4\uff0c\u6211\u4eec\u65b0\u5efa\u4e00\u4e2a\u73ed\u7ea7\u8868\uff0c\u800c\u6bcf\u4e2a\u73ed\u7ea7\u90fd\u6709\u591a\u4e2a\u5b66\u751f\uff0c\r\n# \u6bcf\u4e2a\u5b66\u751f\u5219\u5bf9\u5e94\u4e00\u4e2a\u73ed\u7ea7\uff0c\u73ed\u7ea7\u5bf9\u5b66\u751f\u5c31\u662f\u4e00\u5bf9\u591a\u7684\u5173\u7cfb\u3002\r\n\r\n# \u591a\u5bf9\u591a \uff1a\u6307\u5173\u7cfb\u4e24\u8fb9\u7684\u5b9e\u4f53\u90fd\u53ef\u4ee5\u901a\u8fc7\u5173\u7cfb\u5bf9\u5e94\u591a\u4e2a\u5bf9\u65b9\u7684\u5b9e\u4f53\u3002\u6bd4\u5982\u5728\u8fdb\u8d27\u6a21\u5757\u4e2d\uff0c\r\n# \u4f9b\u8d27\u5546\u4e0e\u8d85\u5e02\u4e4b\u95f4\u7684\u5173\u7cfb\u5c31\u662f\u591a\u5bf9\u591a\u7684\u5173\u7cfb\uff0c\u4e00\u4e2a\u4f9b\u8d27\u5546\u53ef\u4ee5\u7ed9\u591a\u4e2a\u8d85\u5e02\u4f9b\u8d27\uff0c\u4e00\r\n# \u4e2a\u8d85\u5e02\u4e5f\u53ef\u4ee5\u4ece\u591a\u4e2a\u4f9b\u8d27\u5546\u90a3\u91cc\u91c7\u8d2d\u5546\u54c1\u3002\u518d\u6bd4\u5982\u4e00\u4e2a\u9009\u8bfe\u8868\uff0c\u6709\u8bb8\u591a\u79d1\u76ee\uff0c\r\n# \u6bcf\u4e2a\u79d1\u76ee\u6709\u5f88\u591a\u5b66\u751f\u9009\uff0c\u800c\u6bcf\u4e2a\u5b66\u751f\u53c8\u53ef\u4ee5\u9009\u62e9\u591a\u4e2a\u79d1\u76ee\uff0c\u8fd9\u5c31\u662f\u591a\u5bf9\u591a\u7684\u5173\u7cfb\u3002\r\n\r\n# 8.3 \u5efa\u6a21\u5206\u6790\r\n\r\n# 8.4 ER \u6a21\u578b\u7684\u7ec6\u5316\r\n\r\n# 8.5 ER \u6a21\u578b\u56fe\u8f6c\u6362\u6210\u6570\u636e\u8868\r\n\r\n# \u901a\u8fc7\u7ed8\u5236 ER \u6a21\u578b\uff0c\u6211\u4eec\u5df2\u7ecf\u7406\u6e05\u4e86\u4e1a\u52a1\u903b\u8f91\uff0c\u73b0\u5728\uff0c\u6211\u4eec\u5c31\u8981\u8fdb\u884c\u975e\u5e38\u91cd\u8981\u7684\u4e00\u6b65\u4e86\uff1a\r\n# \u628a\u7ed8\u5236\u597d\u7684 ER\u6a21\u578b\uff0c\u8f6c\u6362\u6210\u5177\u4f53\u7684\u6570\u636e\u8868\uff0c\u4e0b\u9762\u4ecb\u7ecd\u4e0b\u8f6c\u6362\u7684\u539f\u5219\uff1a\r\n\r\n# \uff081\uff09\u4e00\u4e2a \u5b9e\u4f53 \u901a\u5e38\u8f6c\u6362\u6210\u4e00\u4e2a \u6570\u636e\u8868 \uff1b\r\n\r\n# \uff082\uff09\u4e00\u4e2a \u591a\u5bf9\u591a\u7684\u5173\u7cfb \uff0c\u901a\u5e38\u4e5f\u8f6c\u6362\u6210\u4e00\u4e2a \u6570\u636e\u8868 \uff1b\r\n\r\n# \uff083\uff09\u4e00\u4e2a 1 \u5bf9 1 \uff0c\u6216\u8005 1 \u5bf9\u591a \u7684\u5173\u7cfb\uff0c\u5f80\u5f80\u901a\u8fc7\u8868\u7684 \u5916\u952e \u6765\u8868\u8fbe\uff0c\u800c\u4e0d\u662f\u8bbe\u8ba1\u4e00\u4e2a\u65b0\u7684\u6570\u636e\u8868\uff1b\r\n\r\n# \uff084\uff09 \u5c5e\u6027 \u8f6c\u6362\u6210\u8868\u7684 \u5b57\u6bb5 \u3002\r\n\r\n# 9. \u6570\u636e\u8868\u7684\u8bbe\u8ba1\u539f\u5219\r\n\r\n# \u7efc\u5408\u4ee5\u4e0a\u5185\u5bb9\uff0c\u603b\u7ed3\u51fa\u6570\u636e\u8868\u8bbe\u8ba1\u7684\u4e00\u822c\u539f\u5219\uff1a\"\u4e09\u5c11\u4e00\u591a\"\r\n\r\n# 1. \u6570\u636e\u8868\u7684\u4e2a\u6570\u8d8a\u5c11\u8d8a\u597d\r\n\r\n# 2. \u6570\u636e\u8868\u4e2d\u7684\u5b57\u6bb5\u4e2a\u6570\u8d8a\u5c11\u8d8a\u597d\r\n\r\n# 3. \u6570\u636e\u8868\u4e2d\u8054\u5408\u4e3b\u952e\u7684\u5b57\u6bb5\u4e2a\u6570\u8d8a\u5c11\u8d8a\u597d\r\n\r\n# 4. \u4f7f\u7528\u4e3b\u952e\u548c\u5916\u952e\u8d8a\u591a\u8d8a\u597d\r\n\r\n# \u6ce8\u610f\uff1a\u8fd9\u4e2a\u539f\u5219\u5e76\u4e0d\u662f\u7edd\u5bf9\u7684\uff0c\u6709\u65f6\u5019\u6211\u4eec\u9700\u8981\u727a\u7272\u6570\u636e\u7684\u5197\u4f59\u5ea6\u6765\u6362\u53d6\u6570\u636e\u5904\u7406\u7684\u6548\u7387\u3002\r\n\r\n# 10. \u6570\u636e\u5e93\u5bf9\u8c61\u7f16\u5199\u5efa\u8bae\r\n\r\n# 10.1 \u5173\u4e8e\u5e93\r\n\r\n# 1. \u3010\u5f3a\u5236\u3011\u5e93\u7684\u540d\u79f0\u5fc5\u987b\u63a7\u5236\u572832\u4e2a\u5b57\u7b26\u4ee5\u5185\uff0c\u53ea\u80fd\u4f7f\u7528\u82f1\u6587\u5b57\u6bcd\u3001\u6570\u5b57\u548c\u4e0b\u5212\u7ebf\uff0c\u5efa\u8bae\u4ee5\u82f1\u6587\u5b57\u6bcd\u5f00\u5934\u3002\r\n\r\n# 2. \u3010\u5f3a\u5236\u3011\u5e93\u540d\u4e2d\u82f1\u6587 \u4e00\u5f8b\u5c0f\u5199 \uff0c\u4e0d\u540c\u5355\u8bcd\u91c7\u7528 \u4e0b\u5212\u7ebf \u5206\u5272\u3002\u987b\u89c1\u540d\u77e5\u610f\u3002\r\n\r\n# 3. \u3010\u5f3a\u5236\u3011\u5e93\u7684\u540d\u79f0\u683c\u5f0f\uff1a\u4e1a\u52a1\u7cfb\u7edf\u540d\u79f0_\u5b50\u7cfb\u7edf\u540d\u3002\r\n\r\n# 4. \u3010\u5f3a\u5236\u3011\u5e93\u540d\u7981\u6b62\u4f7f\u7528\u5173\u952e\u5b57\uff08\u5982type,order\u7b49\uff09\u3002\r\n\r\n# 5. \u3010\u5f3a\u5236\u3011\u521b\u5efa\u6570\u636e\u5e93\u65f6\u5fc5\u987b \u663e\u5f0f\u6307\u5b9a\u5b57\u7b26\u96c6 \uff0c\u5e76\u4e14\u5b57\u7b26\u96c6\u53ea\u80fd\u662futf8\u6216\u8005utf8mb4\u3002\r\n# \u521b\u5efa\u6570\u636e\u5e93SQL\u4e3e\u4f8b\uff1aCREATE DATABASE crm_fund DEFAULT CHARACTER SET 'utf8' ;\r\n\r\n# 6. \u3010\u5efa\u8bae\u3011\u5bf9\u4e8e\u7a0b\u5e8f\u8fde\u63a5\u6570\u636e\u5e93\u8d26\u53f7\uff0c\u9075\u5faa \u6743\u9650\u6700\u5c0f\u539f\u5219\r\n# \u4f7f\u7528\u6570\u636e\u5e93\u8d26\u53f7\u53ea\u80fd\u5728\u4e00\u4e2aDB\u4e0b\u4f7f\u7528\uff0c\u4e0d\u51c6\u8de8\u5e93\u3002\u7a0b\u5e8f\u4f7f\u7528\u7684\u8d26\u53f7 \u539f\u5219\u4e0a\u4e0d\u51c6\u6709drop\u6743\u9650 \u3002\r\n\r\n# 7. \u3010\u5efa\u8bae\u3011\u4e34\u65f6\u5e93\u4ee5 tmp_ \u4e3a\u524d\u7f00\uff0c\u5e76\u4ee5\u65e5\u671f\u4e3a\u540e\u7f00\uff1b\r\n# \u5907\u4efd\u5e93\u4ee5 bak_ \u4e3a\u524d\u7f00\uff0c\u5e76\u4ee5\u65e5\u671f\u4e3a\u540e\u7f00\u3002\r\n\r\n# 10.2 \u5173\u4e8e\u8868\u3001\u5217\r\n\r\n# 1. \u3010\u5f3a\u5236\u3011\u8868\u548c\u5217\u7684\u540d\u79f0\u5fc5\u987b\u63a7\u5236\u572832\u4e2a\u5b57\u7b26\u4ee5\u5185\uff0c\u8868\u540d\u53ea\u80fd\u4f7f\u7528\u82f1\u6587\u5b57\u6bcd\u3001\u6570\u5b57\u548c\u4e0b\u5212\u7ebf\uff0c\r\n# \u5efa\u8bae\u4ee5 \u82f1\u6587\u5b57\u6bcd\u5f00\u5934 \u3002\r\n\r\n# 2. \u3010\u5f3a\u5236\u3011 \u8868\u540d\u3001\u5217\u540d\u4e00\u5f8b\u5c0f\u5199 \uff0c\u4e0d\u540c\u5355\u8bcd\u91c7\u7528\u4e0b\u5212\u7ebf\u5206\u5272\u3002\u987b\u89c1\u540d\u77e5\u610f\u3002\r\n\r\n# 3. \u3010\u5f3a\u5236\u3011\u8868\u540d\u8981\u6c42\u6709\u6a21\u5757\u540d\u5f3a\u76f8\u5173\uff0c\u540c\u4e00\u6a21\u5757\u7684\u8868\u540d\u5c3d\u91cf\u4f7f\u7528 \u7edf\u4e00\u524d\u7f00 \u3002\u6bd4\u5982\uff1acrm_fund_item\r\n\r\n# 4. \u3010\u5f3a\u5236\u3011\u521b\u5efa\u8868\u65f6\u5fc5\u987b \u663e\u5f0f\u6307\u5b9a\u5b57\u7b26\u96c6 \u4e3autf8\u6216utf8mb4\u3002\r\n\r\n# 5. \u3010\u5f3a\u5236\u3011\u8868\u540d\u3001\u5217\u540d\u7981\u6b62\u4f7f\u7528\u5173\u952e\u5b57\uff08\u5982type,order\u7b49\uff09\u3002\r\n\r\n# 6. \u3010\u5f3a\u5236\u3011\u521b\u5efa\u8868\u65f6\u5fc5\u987b \u663e\u5f0f\u6307\u5b9a\u8868\u5b58\u50a8\u5f15\u64ce \u7c7b\u578b\u3002\u5982\u65e0\u7279\u6b8a\u9700\u6c42\uff0c\u4e00\u5f8b\u4e3aInnoDB\u3002\r\n\r\n# 7. \u3010\u5f3a\u5236\u3011\u5efa\u8868\u5fc5\u987b\u6709comment\u3002\r\n\r\n# 8. \u3010\u5f3a\u5236\u3011\u5b57\u6bb5\u547d\u540d\u5e94\u5c3d\u53ef\u80fd\u4f7f\u7528\u8868\u8fbe\u5b9e\u9645\u542b\u4e49\u7684\u82f1\u6587\u5355\u8bcd\u6216 \u7f29\u5199 \u3002\r\n# \u5982\uff1a\u516c\u53f8 ID\uff0c\u4e0d\u8981\u4f7f\u7528corporation_id, \u800c\u7528corp_id \u5373\u53ef\u3002\r\n\r\n# 9. \u3010\u5f3a\u5236\u3011\u5e03\u5c14\u503c\u7c7b\u578b\u7684\u5b57\u6bb5\u547d\u540d\u4e3a is_\u63cf\u8ff0 \u3002\r\n# \u5982member\u8868\u4e0a\u8868\u793a\u662f\u5426\u4e3aenabled\u7684\u4f1a\u5458\u7684\u5b57\u6bb5\u547d\u540d\u4e3a is_enabled\u3002\r\n\r\n# 10. \u3010\u5f3a\u5236\u3011\u7981\u6b62\u5728\u6570\u636e\u5e93\u4e2d\u5b58\u50a8\u56fe\u7247\u3001\u6587\u4ef6\u7b49\u5927\u7684\u4e8c\u8fdb\u5236\u6570\u636e\r\n# \u901a\u5e38\u6587\u4ef6\u5f88\u5927\uff0c\u77ed\u65f6\u95f4\u5185\u9020\u6210\u6570\u636e\u91cf\u5feb\u901f\u589e\u957f\uff0c\u6570\u636e\u5e93\u8fdb\u884c\u6570\u636e\u5e93\u8bfb\u53d6\u65f6\uff0c\r\n# \u901a\u5e38\u4f1a\u8fdb\u884c\u5927\u91cf\u7684\u968f\u673aIO\u64cd\u4f5c\uff0c\u6587\u4ef6\u5f88\u5927\u65f6\uff0cIO\u64cd\u4f5c\u5f88\u8017\u65f6\u3002\r\n# \u901a\u5e38\u5b58\u50a8\u4e8e\u6587\u4ef6\u670d\u52a1\u5668\uff0c\u6570\u636e\u5e93\u53ea\u5b58\u50a8\u6587\u4ef6\u5730\u5740\u4fe1\u606f\u3002\r\n\r\n# 11. \u3010\u5efa\u8bae\u3011\u5efa\u8868\u65f6\u5173\u4e8e\u4e3b\u952e\uff1a \u8868\u5fc5\u987b\u6709\u4e3b\u952e (1)\u5f3a\u5236\u8981\u6c42\u4e3b\u952e\u4e3aid\uff0c\u7c7b\u578b\u4e3aint\u6216bigint\uff0c\r\n# \u4e14\u4e3aauto_increment \u5efa\u8bae\u4f7f\u7528unsigned\u65e0\u7b26\u53f7\u578b\u3002 (2)\u6807\u8bc6\u8868\u91cc\u6bcf\u4e00\u884c\u4e3b\u4f53\u7684\u5b57\u6bb5\u4e0d\u8981\u8bbe\u4e3a\u4e3b\u952e\uff0c\r\n# \u5efa\u8bae\u8bbe\u4e3a\u5176\u4ed6\u5b57\u6bb5\u5982user_id\uff0corder_id\u7b49\uff0c\u5e76\u5efa\u7acbunique key\u7d22\u5f15\u3002\r\n# \u56e0\u4e3a\u5982\u679c\u8bbe\u4e3a\u4e3b\u952e\u4e14\u4e3b\u952e\u503c\u4e3a\u968f\u673a\u63d2\u5165\uff0c\u5219\u4f1a\u5bfc\u81f4innodb\u5185\u90e8\u9875\u5206\u88c2\u548c\u5927\u91cf\u968f\u673aI\/O\uff0c\u6027\u80fd\u4e0b\u964d\u3002\r\n\r\n# 12. \u3010\u5efa\u8bae\u3011\u6838\u5fc3\u8868\uff08\u5982\u7528\u6237\u8868\uff09\u5fc5\u987b\u6709\u884c\u6570\u636e\u7684 \u521b\u5efa\u65f6\u95f4\u5b57\u6bb5 \uff08create_time\uff09\u548c\r\n# \u6700\u540e\u66f4\u65b0\u65f6\u95f4\u5b57\u6bb5\uff08update_time\uff09\uff0c\u4fbf\u4e8e\u67e5\u95ee\u9898\u3002\r\n\r\n# 13. \u3010\u5efa\u8bae\u3011\u8868\u4e2d\u6240\u6709\u5b57\u6bb5\u5c3d\u91cf\u90fd\u662f NOT NULL \u5c5e\u6027\uff0c\u4e1a\u52a1\u53ef\u4ee5\u6839\u636e\u9700\u8981\u5b9a\u4e49 DEFAULT\u503c \u3002\r\n# \u56e0\u4e3a\u4f7f\u7528NULL\u503c\u4f1a\u5b58\u5728\u6bcf\u4e00\u884c\u90fd\u4f1a\u5360\u7528\u989d\u5916\u5b58\u50a8\u7a7a\u95f4\u3001\u6570\u636e\u8fc1\u79fb\u5bb9\u6613\u51fa\u9519\u3001\u805a\u5408\u51fd\u6570\u8ba1\u7b97\u7ed3\u679c\u504f\u5dee\u7b49\u95ee\u9898\u3002\r\n\r\n# 14. \u3010\u5efa\u8bae\u3011\u6240\u6709\u5b58\u50a8\u76f8\u540c\u6570\u636e\u7684 \u5217\u540d\u548c\u5217\u7c7b\u578b\u5fc5\u987b\u4e00\u81f4 \uff08\u4e00\u822c\u4f5c\u4e3a\u5173\u8054\u5217\uff0c\r\n# \u5982\u679c\u67e5\u8be2\u65f6\u5173\u8054\u5217\u7c7b\u578b\u4e0d\u4e00\u81f4\u4f1a\u81ea\u52a8\u8fdb\u884c\u6570\u636e\u7c7b\u578b\u9690\u5f0f\u8f6c\u6362\uff0c\u4f1a\u9020\u6210\u5217\u4e0a\u7684\u7d22\u5f15\u5931\u6548\uff0c\u5bfc\u81f4\u67e5\u8be2\u6548\u7387\u964d\u4f4e\uff09\u3002\r\n\r\n# 15. \u3010\u5efa\u8bae\u3011\u4e2d\u95f4\u8868\uff08\u6216\u4e34\u65f6\u8868\uff09\u7528\u4e8e\u4fdd\u7559\u4e2d\u95f4\u7ed3\u679c\u96c6\uff0c\u540d\u79f0\u4ee5 tmp_ \u5f00\u5934\u3002\r\n# \u5907\u4efd\u8868\u7528\u4e8e\u5907\u4efd\u6216\u6293\u53d6\u6e90\u8868\u5feb\u7167\uff0c\u540d\u79f0\u4ee5 bak_ \u5f00\u5934\u3002\u4e2d\u95f4\u8868\u548c\u5907\u4efd\u8868\u5b9a\u671f\u6e05\u7406\u3002\r\n\r\n# 16. \u3010\u793a\u8303\u3011\u4e00\u4e2a\u8f83\u4e3a\u89c4\u8303\u7684\u5efa\u8868\u8bed\u53e5\uff1a\r\nCREATE TABLE user_info (\r\n    `id` int unsigned NOT NULL AUTO_INCREMENT COMMENT '\u81ea\u589e\u4e3b\u952e',\r\n    `user_id` bigint(11) NOT NULL COMMENT '\u7528\u6237id',\r\n    `username` varchar(45) NOT NULL COMMENT '\u771f\u5b9e\u59d3\u540d',\r\n    `email` varchar(30) NOT NULL COMMENT '\u7528\u6237\u90ae\u7bb1',\r\n    `nickname` varchar(45) NOT NULL COMMENT '\u6635\u79f0',\r\n    `birthday` date NOT NULL COMMENT '\u751f\u65e5',\r\n    `sex` tinyint(4) DEFAULT '0' COMMENT '\u6027\u522b',\r\n    `short_introduce` varchar(150) DEFAULT NULL COMMENT '\u4e00\u53e5\u8bdd\u4ecb\u7ecd\u81ea\u5df1\uff0c\u6700\u591a50\u4e2a\u6c49\u5b57',\r\n    `user_resume` varchar(300) NOT NULL COMMENT '\u7528\u6237\u63d0\u4ea4\u7684\u7b80\u5386\u5b58\u653e\u5730\u5740',\r\n    `user_register_ip` int NOT NULL COMMENT '\u7528\u6237\u6ce8\u518c\u65f6\u7684\u6e90ip',\r\n    `create_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '\u521b\u5efa\u65f6\u95f4',\r\n    `update_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE\r\n    CURRENT_TIMESTAMP COMMENT '\u4fee\u6539\u65f6\u95f4',\r\n    `user_review_status` tinyint NOT NULL COMMENT '\u7528\u6237\u8d44\u6599\u5ba1\u6838\u72b6\u6001\uff0c1\u4e3a\u901a\u8fc7\uff0c2\u4e3a\u5ba1\u6838\u4e2d\uff0c3\u4e3a\u672a\r\n    \u901a\u8fc7\uff0c4\u4e3a\u8fd8\u672a\u63d0\u4ea4\u5ba1\u6838',\r\n    PRIMARY KEY (`id`),\r\n    UNIQUE KEY `uniq_user_id` (`user_id`),\r\n    KEY `idx_username`(`username`),\r\n    KEY `idx_create_time_status`(`create_time`,`user_review_status`)\r\n) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='\u7f51\u7ad9\u7528\u6237\u57fa\u672c\u4fe1\u606f'\r\n\r\n# 17. \u3010\u5efa\u8bae\u3011\u521b\u5efa\u8868\u65f6\uff0c\u53ef\u4ee5\u4f7f\u7528\u53ef\u89c6\u5316\u5de5\u5177\u3002\u8fd9\u6837\u53ef\u4ee5\u786e\u4fdd\u8868\u3001\u5b57\u6bb5\u76f8\u5173\u7684\u7ea6\u5b9a\u90fd\u80fd\u8bbe\u7f6e\u4e0a\u3002\r\n# \u5b9e\u9645\u4e0a\uff0c\u6211\u4eec\u901a\u5e38\u5f88\u5c11\u81ea\u5df1\u5199 DDL \u8bed\u53e5\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e00\u4e9b\u53ef\u89c6\u5316\u5de5\u5177\u6765\u521b\u5efa\u548c\u64cd\u4f5c\u6570\u636e\u5e93\u548c\u6570\u636e\u8868\u3002\r\n# \u53ef\u89c6\u5316\u5de5\u5177\u9664\u4e86\u65b9\u4fbf\uff0c\u8fd8\u80fd\u76f4\u63a5\u5e2e\u6211\u4eec\u5c06\u6570\u636e\u5e93\u7684\u7ed3\u6784\u5b9a\u4e49\u8f6c\u5316\u6210 SQL \u8bed\u8a00\uff0c\r\n# \u65b9\u4fbf\u6570\u636e\u5e93\u548c\u6570\u636e\u8868\u7ed3\u6784\u7684\u5bfc\u51fa\u548c\u5bfc\u5165\u3002\r\n\r\n# 10.3 \u5173\u4e8e\u7d22\u5f15\r\n\r\n# 1. \u3010\u5f3a\u5236\u3011InnoDB\u8868\u5fc5\u987b\u4e3b\u952e\u4e3aid int\/bigint auto_increment\uff0c\u4e14\u4e3b\u952e\u503c \u7981\u6b62\u88ab\u66f4\u65b0 \u3002\r\n\r\n# 2. \u3010\u5f3a\u5236\u3011InnoDB\u548cMyISAM\u5b58\u50a8\u5f15\u64ce\u8868\uff0c\u7d22\u5f15\u7c7b\u578b\u5fc5\u987b\u4e3a BTREE \u3002\r\n\r\n# 3. \u3010\u5efa\u8bae\u3011\u4e3b\u952e\u7684\u540d\u79f0\u4ee5 pk_ \u5f00\u5934\uff0c\u552f\u4e00\u952e\u4ee5 uni_ \u6216 uk_ \u5f00\u5934\uff0c\u666e\u901a\u7d22\u5f15\u4ee5 idx_ \u5f00\u5934\uff0c\r\n# \u4e00\u5f8b\u4f7f\u7528\u5c0f\u5199\u683c\u5f0f\uff0c\u4ee5\u5b57\u6bb5\u7684\u540d\u79f0\u6216\u7f29\u5199\u4f5c\u4e3a\u540e\u7f00\u3002\r\n\r\n# 4. \u3010\u5efa\u8bae\u3011\u591a\u5355\u8bcd\u7ec4\u6210\u7684columnname\uff0c\u53d6\u524d\u51e0\u4e2a\u5355\u8bcd\u9996\u5b57\u6bcd\uff0c\u52a0\u672b\u5355\u8bcd\u7ec4\u6210column_name\u3002\r\n# \u5982:sample \u8868 member_id \u4e0a\u7684\u7d22\u5f15\uff1aidx_sample_mid\u3002\r\n\r\n# 5. \u3010\u5efa\u8bae\u3011\u5355\u4e2a\u8868\u4e0a\u7684\u7d22\u5f15\u4e2a\u6570 \u4e0d\u80fd\u8d85\u8fc76\u4e2a \u3002\r\n\r\n# 6. \u3010\u5efa\u8bae\u3011\u5728\u5efa\u7acb\u7d22\u5f15\u65f6\uff0c\u591a\u8003\u8651\u5efa\u7acb \u8054\u5408\u7d22\u5f15 \uff0c\u5e76\u628a\u533a\u5206\u5ea6\u6700\u9ad8\u7684\u5b57\u6bb5\u653e\u5728\u6700\u524d\u9762\u3002\r\n\r\n# 7. \u3010\u5efa\u8bae\u3011\u5728\u591a\u8868 JOIN \u7684SQL\u91cc\uff0c\u4fdd\u8bc1\u88ab\u9a71\u52a8\u8868\u7684\u8fde\u63a5\u5217\u4e0a\u6709\u7d22\u5f15\uff0c\u8fd9\u6837JOIN \u6267\u884c\u6548\u7387\u6700\u9ad8\u3002\r\n\r\n# 8. \u3010\u5efa\u8bae\u3011\u5efa\u8868\u6216\u52a0\u7d22\u5f15\u65f6\uff0c\u4fdd\u8bc1\u8868\u91cc\u4e92\u76f8\u4e0d\u5b58\u5728 \u5197\u4f59\u7d22\u5f15 \u3002\r\n# \u6bd4\u5982\uff1a\u5982\u679c\u8868\u91cc\u5df2\u7ecf\u5b58\u5728key(a,b)\uff0c\u5219key(a)\u4e3a\u5197\u4f59\u7d22\u5f15\uff0c\u9700\u8981\u5220\u9664\u3002\r\n\r\n# 10.4 SQL\u7f16\u5199\r\n\r\n# 1. \u3010\u5f3a\u5236\u3011\u7a0b\u5e8f\u7aefSELECT\u8bed\u53e5\u5fc5\u987b\u6307\u5b9a\u5177\u4f53\u5b57\u6bb5\u540d\u79f0\uff0c\u7981\u6b62\u5199\u6210 *\u3002\r\n\r\n# 2. \u3010\u5efa\u8bae\u3011\u7a0b\u5e8f\u7aefinsert\u8bed\u53e5\u6307\u5b9a\u5177\u4f53\u5b57\u6bb5\u540d\u79f0\uff0c\u4e0d\u8981\u5199\u6210INSERT INTO t1 VALUES(\u2026)\u3002\r\n\r\n# 3. \u3010\u5efa\u8bae\u3011\u9664\u9759\u6001\u8868\u6216\u5c0f\u8868\uff08100\u884c\u4ee5\u5185\uff09\uff0cDML\u8bed\u53e5\u5fc5\u987b\u6709WHERE\u6761\u4ef6\uff0c\u4e14\u4f7f\u7528\u7d22\u5f15\u67e5\u627e\u3002\r\n\r\n# 4. \u3010\u5efa\u8bae\u3011INSERT INTO\u2026VALUES(XX),(XX),(XX).. \u8fd9\u91ccXX\u7684\u503c\u4e0d\u8981\u8d85\u8fc75000\u4e2a\u3002\r\n# \u503c\u8fc7\u591a\u867d\u7136\u4e0a\u7ebf\u5f88\u5feb\uff0c\u4f46\u4f1a\u5f15\u8d77\u4e3b\u4ece\u540c\u6b65\u5ef6\u8fdf\u3002\r\n\r\n# 5. \u3010\u5efa\u8bae\u3011SELECT\u8bed\u53e5\u4e0d\u8981\u4f7f\u7528UNION\uff0c\u63a8\u8350\u4f7f\u7528UNION ALL\uff0c\u5e76\u4e14UNION\u5b50\u53e5\u4e2a\u6570\u9650\u5236\u57285\u4e2a\u4ee5\u5185\u3002\r\n\r\n# 6. \u3010\u5efa\u8bae\u3011\u7ebf\u4e0a\u73af\u5883\uff0c\u591a\u8868 JOIN \u4e0d\u8981\u8d85\u8fc75\u4e2a\u8868\u3002\r\n\r\n# 7. \u3010\u5efa\u8bae\u3011\u51cf\u5c11\u4f7f\u7528ORDER BY\uff0c\u548c\u4e1a\u52a1\u6c9f\u901a\u80fd\u4e0d\u6392\u5e8f\u5c31\u4e0d\u6392\u5e8f\uff0c\u6216\u5c06\u6392\u5e8f\u653e\u5230\u7a0b\u5e8f\u7aef\u53bb\u505a\u3002\r\n# ORDERBY\u3001GROUP BY\u3001DISTINCT \u8fd9\u4e9b\u8bed\u53e5\u8f83\u4e3a\u8017\u8d39CPU\uff0c\u6570\u636e\u5e93\u7684CPU\u8d44\u6e90\u662f\u6781\u5176\u5b9d\u8d35\u7684\u3002\r\n\r\n# 8. \u3010\u5efa\u8bae\u3011\u5305\u542b\u4e86ORDER BY\u3001GROUP BY\u3001DISTINCT \u8fd9\u4e9b\u67e5\u8be2\u7684\u8bed\u53e5\uff0c\r\n# WHERE \u6761\u4ef6\u8fc7\u6ee4\u51fa\u6765\u7684\u7ed3\u679c\u96c6\u8bf7\u4fdd\u6301\u57281000\u884c\u4ee5\u5185\uff0c\u5426\u5219SQL\u4f1a\u5f88\u6162\u3002\r\n\r\n# 9. \u3010\u5efa\u8bae\u3011\u5bf9\u5355\u8868\u7684\u591a\u6b21alter\u64cd\u4f5c\u5fc5\u987b\u5408\u5e76\u4e3a\u4e00\u6b21\r\n# \u5bf9\u4e8e\u8d85\u8fc7100W\u884c\u7684\u5927\u8868\u8fdb\u884calter table\uff0c\u5fc5\u987b\u7ecf\u8fc7DBA\u5ba1\u6838\uff0c\u5e76\u5728\u4e1a\u52a1\u4f4e\u5cf0\u671f\u6267\u884c\uff0c\r\n# \u591a\u4e2aalter\u9700\u6574\u5408\u5728\u4e00\u8d77\u3002 \u56e0\u4e3aalter table\u4f1a\u4ea7\u751f \u8868\u9501 \uff0c\u671f\u95f4\u963b\u585e\u5bf9\u4e8e\u8be5\u8868\u7684\u6240\u6709\u5199\u5165\uff0c\r\n# \u5bf9\u4e8e\u4e1a\u52a1\u53ef\u80fd\u4f1a\u4ea7\u751f\u6781\u5927\u5f71\u54cd\u3002\r\n\r\n# 10. \u3010\u5efa\u8bae\u3011\u6279\u91cf\u64cd\u4f5c\u6570\u636e\u65f6\uff0c\u9700\u8981\u63a7\u5236\u4e8b\u52a1\u5904\u7406\u95f4\u9694\u65f6\u95f4\uff0c\u8fdb\u884c\u5fc5\u8981\u7684sleep\u3002\r\n\r\n# 11. \u3010\u5efa\u8bae\u3011\u4e8b\u52a1\u91cc\u5305\u542bSQL\u4e0d\u8d85\u8fc75\u4e2a\u3002\r\n# \u56e0\u4e3a\u8fc7\u957f\u7684\u4e8b\u52a1\u4f1a\u5bfc\u81f4\u9501\u6570\u636e\u8f83\u4e45\uff0cMySQL\u5185\u90e8\u7f13\u5b58\u3001\u8fde\u63a5\u6d88\u8017\u8fc7\u591a\u7b49\u95ee\u9898\u3002\r\n\r\n# 12. \u3010\u5efa\u8bae\u3011\u4e8b\u52a1\u91cc\u66f4\u65b0\u8bed\u53e5\u5c3d\u91cf\u57fa\u4e8e\u4e3b\u952e\u6216UNIQUE KEY\uff0c\u5982UPDATE\u2026 WHERE id=XX;\r\n# \u5426\u5219\u4f1a\u4ea7\u751f\u95f4\u9699\u9501\uff0c\u5185\u90e8\u6269\u5927\u9501\u5b9a\u8303\u56f4\uff0c\u5bfc\u81f4\u7cfb\u7edf\u6027\u80fd\u4e0b\u964d\uff0c\u4ea7\u751f\u6b7b\u9501\u3002\r\n\r\n\r\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">7. \u5b9e\u6218\u6848\u4f8b<\/h3>\n\n\n\n<p>\u8303\u5f0f\u7684\u5b9e\u6218\u6848\u4f8b<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u5b9e\u6218\u6848\u4f8b-1-1024x569.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"569\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u5b9e\u6218\u6848\u4f8b-1-1024x569.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-1652\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u8003\u86511NF-1-1024x569.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"569\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u8003\u86511NF-1-1024x569.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-1653\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u8003\u86512NF1-1-1024x569.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"569\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u8003\u86512NF1-1-1024x569.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-1654\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u8003\u86512NF2-1-1024x569.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"569\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u8003\u86512NF2-1-1024x569.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-1663\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u8003\u86512NF3-1-1024x569.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"569\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u8003\u86512NF3-1-1024x569.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-1659\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u8003\u86512NF4-1-1024x569.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"569\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u8003\u86512NF4-1-1024x569.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-1655\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u8003\u86512NF5-1-1024x569.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"569\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u8003\u86512NF5-1-1024x569.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-1656\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u8003\u86512NF6-1-1024x569.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"569\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u8003\u86512NF6-1-1024x569.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-1657\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u8003\u86512NF7-1-1024x569.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"569\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u8003\u86512NF7-1-1024x569.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-1658\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u8003\u86513NF1-1-1024x569.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"569\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u8003\u86513NF1-1-1024x569.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-1664\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u8003\u86513NF2-1-1024x569.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"569\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u8003\u86513NF2-1-1024x569.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-1662\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u53cd\u8303\u5f0f\u53161-1-1024x569.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"569\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u53cd\u8303\u5f0f\u53161-1-1024x569.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-1660\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u53cd\u8303\u5f0f\u53162-1-1024x569.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"569\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u53cd\u8303\u5f0f\u53162-1-1024x569.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-1661\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u53cd\u8303\u5f0f\u53163-1-1024x569.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"569\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/\u53cd\u8303\u5f0f\u53163-1-1024x569.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-1665\"  sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/div><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">8. ER\u6a21\u578b<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">8.3 \u5efa\u6a21\u5206\u6790<\/h4>\n\n\n\n<p>ER \u6a21\u578b\u770b\u8d77\u6765\u6bd4\u8f83\u9ebb\u70e6\uff0c\u4f46\u662f\u5bf9\u6211\u4eec\u628a\u63a7\u9879\u76ee\u6574\u4f53\u975e\u5e38\u91cd\u8981\u3002\u5982\u679c\u4f60\u53ea\u662f\u5f00\u53d1\u4e00\u4e2a\u5c0f\u5e94\u7528\uff0c\u6216\u8bb8\u7b80\u5355\u8bbe<br>\u8ba1\u51e0\u4e2a\u8868\u591f\u7528\u4e86\uff0c\u4e00\u65e6\u8981\u8bbe\u8ba1\u6709\u4e00\u5b9a\u89c4\u6a21\u7684\u5e94\u7528\uff0c\u5728\u9879\u76ee\u7684\u521d\u59cb\u9636\u6bb5\uff0c\u5efa\u7acb\u5b8c\u6574\u7684 ER \u6a21\u578b\u5c31\u975e\u5e38\u5173\u952e<br>\u4e86\u3002\u5f00\u53d1\u5e94\u7528\u9879\u76ee\u7684\u5b9e\u8d28\uff0c\u5176\u5b9e\u5c31\u662f \u5efa\u6a21 \u3002<\/p>\n\n\n\n<p><br>\u6211\u4eec\u8bbe\u8ba1\u7684\u6848\u4f8b\u662f \u7535\u5546\u4e1a\u52a1 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src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"735\" height=\"509\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/image-25.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-1668\"  sizes=\"(max-width: 735px) 100vw, 735px\" \/><\/div><\/figure>\n\n\n\n<p>\u5728\u8fd9\u4e2a\u56fe\u4e2d\uff0c\u5730\u5740\u548c\u7528\u6237\u4e4b\u95f4\u7684\u6dfb\u52a0\u5173\u7cfb\uff0c\u662f\u4e00\u5bf9\u591a\u7684\u5173\u7cfb\uff0c\u800c\u5546\u54c1\u548c\u5546\u54c1\u8be6\u60c5\u793a\u4e00\u5bf91\u7684\u5173\u7cfb\uff0c\u5546\u54c1\u548c<br>\u8ba2\u5355\u662f\u591a\u5bf9\u591a\u7684\u5173\u7cfb\u3002 \u8fd9\u4e2a ER 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8\u79cd\u5173\u7cfb\u3002<br>\uff081\uff09\u7528\u6237\u53ef\u4ee5\u5728\u7535\u5546\u5e73\u53f0\u6dfb\u52a0\u591a\u4e2a\u5730\u5740\uff1b<br>\uff082\uff09\u7528\u6237\u53ea\u80fd\u62e5\u6709\u4e00\u4e2a\u8d2d\u7269\u8f66\uff1b<br>\uff083\uff09\u7528\u6237\u53ef\u4ee5\u751f\u6210\u591a\u4e2a\u8ba2\u5355\uff1b<br>\uff084\uff09\u7528\u6237\u53ef\u4ee5\u53d1\u8868\u591a\u6761\u8bc4\u8bba\uff1b<br>\uff085\uff09\u4e00\u4ef6\u5546\u54c1\u53ef\u4ee5\u6709\u591a\u6761\u8bc4\u8bba\uff1b<br>\uff086\uff09\u6bcf\u4e00\u4e2a\u5546\u54c1\u5206\u7c7b\u5305\u542b\u591a\u79cd\u5546\u54c1\uff1b<br>\uff087\uff09\u4e00\u4e2a\u8ba2\u5355\u53ef\u4ee5\u5305\u542b\u591a\u4e2a\u5546\u54c1\uff0c\u4e00\u4e2a\u5546\u54c1\u53ef\u4ee5\u5728\u591a\u4e2a\u8ba2\u5355\u91cc\u3002<br>\uff088\uff09\u8ba2\u5355\u4e2d\u53c8\u5305\u542b\u591a\u4e2a\u8ba2\u5355\u8be6\u60c5\uff0c\u56e0\u4e3a\u4e00\u4e2a\u8ba2\u5355\u4e2d\u53ef\u80fd\u5305\u542b\u4e0d\u540c\u79cd\u7c7b\u7684\u5546\u54c1<\/p>\n\n\n\n<h4 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