{"id":1538,"date":"2022-11-10T21:12:59","date_gmt":"2022-11-10T13:12:59","guid":{"rendered":"https:\/\/qaqaq.top\/?p=1538"},"modified":"2022-11-27T12:40:58","modified_gmt":"2022-11-27T04:40:58","slug":"dml%e4%b9%8b%e6%b7%bb%e5%8a%a0%e6%95%b0%e6%8d%ae%e3%80%81dml%e4%b9%8b%e6%9b%b4%e6%96%b0%e5%88%a0%e9%99%a4%e6%93%8d%e4%bd%9c_mysql8%e6%96%b0%e7%89%b9%e6%80%a7%e4%b9%8b%e8%ae%a1%e7%ae%97%e5%88%97","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=1538","title":{"rendered":"DML\u4e4b\u6dfb\u52a0\u6570\u636e\u3001DML\u4e4b\u66f4\u65b0\u5220\u9664\u64cd\u4f5c_MySQL8\u65b0\u7279\u6027\u4e4b\u8ba1\u7b97\u5217\u3001DDL\u548cDML\u7684\u7efc\u5408\u6848\u4f8b"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code># \u7b2c11\u7ae0_\u6570\u636e\u5904\u7406\u4e4b\u589e\u5220\u6539\r\n\r\n# 0. \u50a8\u5907\u5de5\u4f5c\r\nUSE atguigudb;\r\n\r\nCREATE TABLE IF NOT EXISTS emp1(\r\n    id INT,\r\n    `name` VARCHAR(15),\r\n    hire_date DATE,\r\n    salary DOUBLE(10,2)\r\n);\r\n\r\nDESC emp1;\r\n\r\nSELECT *\r\nFROM emp1;\r\n\r\n# 1. \u6dfb\u52a0\u6570\u636e\r\n\r\n#\u65b9\u5f0f1\uff1a\u4e00\u6761\u4e00\u6761\u7684\u6dfb\u52a0\u6570\u636e\r\n\r\n# \u2460 \u6ca1\u6709\u6307\u660e\u6dfb\u52a0\u7684\u5b57\u6bb5\r\n#\u6b63\u786e\u7684\r\nINSERT INTO emp1\r\nVALUES (1,'Tom','2000-12-21',3400); #\u6ce8\u610f\uff1a\u4e00\u5b9a\u8981\u6309\u7167\u58f0\u660e\u7684\u5b57\u6bb5\u7684\u5148\u540e\u987a\u5e8f\u6dfb\u52a0\r\n#\u9519\u8bef\u7684\r\nINSERT INTO emp1\r\nVALUES (2,3400,'2000-12-21','Jerry');\r\n\r\n# \u2461 \u6307\u660e\u8981\u6dfb\u52a0\u7684\u5b57\u6bb5\uff08\u63a8\u8350\uff09\r\nINSERT INTO emp1(id,hire_date,salary,`name`)\r\nVALUES(2,'1999-09-09',4000,'Jerry');\r\n# \u8bf4\u660e\uff1a\u6ca1\u6709\u8fdb\u884c\u8d4b\u503c\u7684hire_date \u7684\u503c\u4e3a null\r\nINSERT INTO emp1(id,salary,`name`)\r\nVALUES(3,4500,'shk');\r\n\r\n# \u2462 \u540c\u65f6\u63d2\u5165\u591a\u6761\u8bb0\u5f55\r\nINSERT INTO emp1(id,name,salary)\r\nVALUES(4,'Jim',5000),\r\n       (5,'\u5f20\u4fca\u6770',5500);\r\n\r\n#\u65b9\u5f0f2\uff1a\u5c06\u67e5\u8be2\u7ed3\u679c\u63d2\u5165\u5230\u8868\u4e2d\r\n\r\nSELECT * FROM emp1;\r\n\r\nINSERT INTO emp1(id,name,salary,hire_date)\r\n#\u67e5\u8be2\u8bed\u53e5\r\nSELECT employee_id,last_name,salary,hire_date   # \u67e5\u8be2\u7684\u5b57\u6bb5\u4e00\u5b9a\u8981\u4e0e\u6dfb\u52a0\u5230\u7684\u8868\u7684\u5b57\u6bb5\u4e00\u4e00\u5bf9\u5e94\r\nFROM employees\r\nWHERE department_id IN (60,70);\r\n\r\nDESC emp1;\r\nDESC employees;\r\n\r\n#\u8bf4\u660e\uff1aemp1\u8868\u4e2d\u8981\u6dfb\u52a0\u6570\u636e\u7684\u5b57\u6bb5\u7684\u957f\u5ea6\u4e0d\u80fd\u4f4e\u4e8eemployees\u8868\u4e2d\u67e5\u8be2\u7684\u5b57\u6bb5\u7684\u957f\u5ea6\u3002\r\n# \u5982\u679cemp1\u8868\u4e2d\u8981\u6dfb\u52a0\u6570\u636e\u7684\u5b57\u6bb5\u7684\u957f\u5ea6\u4f4e\u4e8eemployees\u8868\u4e2d\u67e5\u8be2\u7684\u5b57\u6bb5\u7684\u957f\u5ea6\u7684\u8bdd\uff0c\u5c31\u6709\u6dfb\u52a0\u4e0d\u6210\u529f\u7684\u98ce\u9669\u3002\r\n\r\n# 2. \u66f4\u65b0\u6570\u636e\uff08\u6216\u4fee\u6539\u6570\u636e\uff09\r\n# UPDATE...SET...WHERE...\r\n# \u53ef\u4ee5\u5b9e\u73b0\u6279\u91cf\u4fee\u6539\u6570\u636e\u7684\u3002\r\nUPDATE emp1\r\nSET hire_date = CURDATE()\r\nWHERE id = 5;\r\n\r\nSELECT * FROM emp1;\r\n\r\n#\u540c\u65f6\u4fee\u6539\u4e00\u6761\u6570\u636e\u7684\u591a\u4e2a\u5b57\u6bb5\r\nUPDATE emp1\r\nSET hire_date = CURDATE(),salary = 6000\r\nWHERE id = 4;\r\n\r\n#\u9898\u76ee\uff1a\u5c06\u8868\u4e2d\u59d3\u540d\u4e2d\u5305\u542b\u5b57\u7b26a\u7684\u63d0\u85aa20%\r\nUPDATE emp1\r\nSET salary = salary * 1.2\r\nWHERE NAME LIKE '%a%';\r\n\r\n#\u4fee\u6539\u6570\u636e\u65f6\uff0c\u662f\u53ef\u80fd\u5b58\u5728\u4e0d\u6210\u529f\u7684\u60c5\u51b5\u7684\u3002\uff08\u53ef\u80fd\u662f\u7531\u4e8e\u7ea6\u675f\u7684\u5f71\u54cd\u9020\u6210\u7684\uff09\r\nUPDATE employees\r\nSET department_id = 10000\r\nWHERE employee_id = 102;\r\n\r\n# 3. \u5220\u9664\u6570\u636e DELETE FROM....WHERE....\r\n\r\nDELETE FROM emp1\r\nWHERE id = 1;\r\n#\u5728\u5220\u9664\u6570\u636e\u65f6\uff0c\u4e5f\u6709\u53ef\u80fd\u56e0\u4e3a\u7ea6\u675f\u7684\u5f71\u54cd\uff0c\u5bfc\u81f4\u5220\u9664\u5931\u8d25\r\nDELETE FROM departments\r\nWHERE department_id = 50;\r\n\r\n#\u5c0f\u7ed3\uff1aDML\u64cd\u4f5c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u6267\u884c\u5b8c\u4ee5\u540e\u90fd\u4f1a\u81ea\u52a8\u63d0\u4ea4\u6570\u636e\u3002\r\n# \u5982\u679c\u5e0c\u671b\u6267\u884c\u5b8c\u4ee5\u540e\u4e0d\u81ea\u52a8\u63d0\u4ea4\u6570\u636e\uff0c\u5219\u9700\u8981\u4f7f\u7528 SEL AUTOCOMMIT = FALSE.\r\n\r\n# 4. MySQL8\u7684\u65b0\u7279\u6027\uff1a\u8ba1\u7b97\u5217\r\nUSE atguigudb;\r\n\r\nCREATE TABLE test1(\r\n    a INT,\r\n    b INT,\r\n    c INT GENERATED ALWAYS AS (a + b) VIRTUAL   #\u5b57\u6bb5c\u5373\u4e3a\u8ba1\u7b97\u5217\r\n);\r\n\r\nINSERT INTO test1(a,b)\r\nVALUES(10,20);\r\n\r\nSELECT * FROM test1;\r\n\r\nUPDATE test1\r\nSET a = 100;\r\n\r\n# 5. \u7efc\u5408\u6848\u4f8b\r\n# 1\u3001\u521b\u5efa\u6570\u636e\u5e93test01_library\r\nCREATE DATABASE IF NOT EXISTS test01_library CHARACTER SET 'utf8';\r\n\r\nUSE test01_library;\r\n\r\n# 2\u3001\u521b\u5efa\u8868 books\uff0c\u8868\u7ed3\u6784\u5982\u4e0b\uff1a\r\n# \u5b57\u6bb5\u540d      \u5b57\u6bb5\u8bf4\u660e       \u6570\u636e\u7c7b\u578b\r\n# id          \u4e66\u7f16\u53f7        INT\r\n# name        \u4e66\u540d          VARCHAR(50)\r\n# authors     \u4f5c\u8005          VARCHAR(100)\r\n# price       \u4ef7\u683c          FLOAT\r\n# pubdate     \u51fa\u7248\u65e5\u671f      YEAR\r\n# note        \u8bf4\u660e          VARCHAR(100)\r\n# num         \u5e93\u5b58          INT\r\nCREATE TABLE IF NOT EXISTS books (\r\n    id INT,\r\n    `name` VARCHAR(50),\r\n    `authors` VARCHAR(100),\r\n    price FLOAT,\r\n    pubdate YEAR,\r\n    note VARCHAR(100),\r\n    num INT\r\n);\r\n\r\nDESC books;\r\n\r\nSELECT * FROM books;\r\n\r\n# 3\u3001\u5411books\u8868\u4e2d\u63d2\u5165\u8bb0\u5f55\r\n# 1\uff09\u4e0d\u6307\u5b9a\u5b57\u6bb5\u540d\u79f0\uff0c\u63d2\u5165\u7b2c\u4e00\u6761\u8bb0\u5f55\r\nINSERT INTO books\r\nVALUES(1,'Tal of AAA','Dickes',23,'1995','novel',11);\r\n\r\n# 2\uff09\u6307\u5b9a\u6240\u6709\u5b57\u6bb5\u540d\u79f0\uff0c\u63d2\u5165\u7b2c\u4e8c\u8bb0\u5f55\r\nINSERT INTO books(ID,name,authors,price,pubdate,note,num)\r\nVALUES(2,'EmmaT','Jane lura',35,'1993','joke',22);\r\n\r\n# 3\uff09\u540c\u65f6\u63d2\u5165\u591a\u6761\u8bb0\u5f55\uff08\u5269\u4e0b\u7684\u6240\u6709\u8bb0\u5f55\uff09\r\nINSERT INTO books(id,name,authors,price,pubdate,note,num)\r\nVALUES\r\n       (3,'Story of Jane','Jane Tim',40,2001,'novel',0),\r\n       (4,'Lovey Day','George Byron',20,2005,'novel',30),\r\n       (5,'Old land','Honore Blade',30,2010,'Law',0),\r\n       (6,'The Battle','Upton Sara',30,1999,'medicine',40),\r\n       (7,'Rose Hood','Richard haggard',28,2008,'cartoon',28);\r\n\r\n# id  name            authors             price   pubdate     note        num\r\n# 1   Tal of AAA      Dickes              23      1995        novel       11\r\n# 2   EmmaT           Jane lura           35      1993        joke        22\r\n# 3   Story of Jane   Jane Tim            40      2001        novel       0\r\n# 4   Lovey Day       George Byron        20      2005        novel       30\r\n# 5   Old land        Honore Blade        30      2010        law         0\r\n# 6   The Battle      Upton Sara          30      1999        medicine    40\r\n# 7   Rose Hood       Richard haggard     28      2008        cartoon     28\r\n\r\n# 4\u3001\u5c06\u5c0f\u8bf4\u7c7b\u578b(novel)\u7684\u4e66\u7684\u4ef7\u683c\u90fd\u589e\u52a05\u3002\r\nUPDATE books\r\nSET price = price + 5\r\nWHERE note = 'novel';\r\n\r\n# 5\u3001\u5c06\u540d\u79f0\u4e3aEmmaT\u7684\u4e66\u7684\u4ef7\u683c\u6539\u4e3a40\uff0c\u5e76\u5c06\u8bf4\u660e\u6539\u4e3adrama\u3002\r\nUPDATE books\r\nSET price = 40,note = 'drama'\r\nWHERE name = 'EmmaT';\r\n\r\n# 6\u3001\u5220\u9664\u5e93\u5b58\u4e3a0\u7684\u8bb0\u5f55\u3002\r\nDELETE FROM books\r\nWHERE num = 0;\r\n\r\n# 7\u3001\u7edf\u8ba1\u4e66\u540d\u4e2d\u5305\u542ba\u5b57\u6bcd\u7684\u4e66\r\nSELECT name\r\nFROM books\r\nWHERE name LIKE '%a%';\r\n\r\n# 8\u3001\u7edf\u8ba1\u4e66\u540d\u4e2d\u5305\u542ba\u5b57\u6bcd\u7684\u4e66\u7684\u6570\u91cf\u548c\u5e93\u5b58\u603b\u91cf\r\nSELECT COUNT(*),SUM(num)\r\nFROM books\r\nWHERE name LIKE '%a%';\r\n\r\n# 9\u3001\u627e\u51fa\u201cnovel\u201d\u7c7b\u578b\u7684\u4e66\uff0c\u6309\u7167\u4ef7\u683c\u964d\u5e8f\u6392\u5217\r\nSELECT name,note,price\r\nFROM books\r\nWHERE note = 'novel'\r\nORDER BY price DESC;\r\n\r\n# 10\u3001\u67e5\u8be2\u56fe\u4e66\u4fe1\u606f\uff0c\u6309\u7167\u5e93\u5b58\u91cf\u964d\u5e8f\u6392\u5217\uff0c\u5982\u679c\u5e93\u5b58\u91cf\u76f8\u540c\u7684\u6309\u7167note\u5347\u5e8f\u6392\u5217\r\nSELECT *\r\nFROM books\r\nORDER BY num DESC,note ASC;\r\n\r\n# 11\u3001\u6309\u7167note\u5206\u7c7b\u7edf\u8ba1\u4e66\u7684\u6570\u91cf\r\nSELECT note,COUNT(*)\r\nFROM books\r\nGROUP BY note;\r\n\r\n# 12\u3001\u6309\u7167note\u5206\u7c7b\u7edf\u8ba1\u4e66\u7684\u5e93\u5b58\u91cf\uff0c\u663e\u793a\u5e93\u5b58\u91cf\u8d85\u8fc730\u672c\u7684\r\nSELECT note,SUM(num)\r\nFROM books\r\nGROUP BY note\r\nHAVING SUM(num) > 30;\r\n\r\n# 13\u3001\u67e5\u8be2\u6240\u6709\u56fe\u4e66\uff0c\u6bcf\u9875\u663e\u793a5\u672c\uff0c\u663e\u793a\u7b2c\u4e8c\u9875\r\nSELECT *\r\nFROM books\r\nLIMIT 5,5;\r\n\r\n# 14\u3001\u6309\u7167note\u5206\u7c7b\u7edf\u8ba1\u4e66\u7684\u5e93\u5b58\u91cf\uff0c\u663e\u793a\u5e93\u5b58\u91cf\u6700\u591a\u7684\r\nSELECT note,SUM(num) sum_num\r\nFROM books\r\nGROUP BY note\r\nORDER BY sum_num DESC\r\nLIMIT 0,1;\r\n# 15\u3001\u67e5\u8be2\u4e66\u540d\u8fbe\u523010\u4e2a\u5b57\u7b26\u7684\u4e66\uff0c\u4e0d\u5305\u62ec\u91cc\u9762\u7684\u7a7a\u683c\r\nSELECT CHAR_LENGTH(REPLACE(name,' ',''))\r\nFROM books\r\n\r\nSELECT name\r\nFROM books\r\nWHERE CHAR_LENGTH(REPLACE(name,' ','')) >= 10;\r\n\r\n# 16\u3001\u67e5\u8be2\u4e66\u540d\u548c\u7c7b\u578b\uff0c\u5176\u4e2dnote\u503c\u4e3anovel\u663e\u793a\u5c0f\u8bf4\uff0claw\u663e\u793a\u6cd5\u5f8b\uff0cmedicine\u663e\u793a\u533b\u836f\uff0ccartoon\u663e\u793a\u5361\u901a\uff0cjoke\u663e\u793a\u7b11\u8bdd\r\nSELECT name \"\u4e66\u540d\",note,CASE note WHEN 'novel' THEN '\u5c0f\u8bf4\r\n'                                 WHEN 'law' THEN '\u6cd5\u5f8b'\r\n                                  WHEN 'medicine' THEN '\u533b\u836f'\r\n                                  WHEN 'cartoon' THEN '\u5361\u901a'\r\n                                  WHEN 'joke' THEN '\u7b11\u8bdd'\r\n                                  ELSE '\u5176\u4ed6'\r\n                                  END \"\u7c7b\u578b\"\r\nFROM books;\r\n# 17\u3001\u67e5\u8be2\u4e66\u540d\u3001\u5e93\u5b58\uff0c\u5176\u4e2dnum\u503c\u8d85\u8fc730\u672c\u7684\uff0c\u663e\u793a\u6ede\u9500\uff0c\u5927\u4e8e0\u5e76\u4f4e\u4e8e10\u7684\uff0c\u663e\u793a\u7545\u9500\uff0c\u4e3a0\u7684\u663e\u793a\u9700\u8981\u65e0\u8d27\r\nSELECT name AS \"\u4e66\u540d\",num AS \"\u5e93\u5b58\", CASE WHEN num > 30 THEN '\u6ede\u9500'\r\n                                          WHEN num > 0 AND num &lt; 10 THEN '\u7545\u9500'\r\n                                          WHEN num = 0 THEN '\u65e0\u8d27'\r\n                                          ELSE '\u6b63\u5e38'\r\n                                          END \"\u663e\u793a\u72b6\u6001\"\r\nFROM books;\r\n# 18\u3001\u7edf\u8ba1\u6bcf\u4e00\u79cdnote\u7684\u5e93\u5b58\u91cf\uff0c\u5e76\u5408\u8ba1\u603b\u91cf\r\nSELECT IFNULL(note,'\u5408\u8ba1\u5e93\u5b58\u603b\u91cf') AS note,SUM(num)\r\nFROM books\r\nGROUP BY note WITH ROLLUP;\r\n\r\n# 19\u3001\u7edf\u8ba1\u6bcf\u4e00\u79cdnote\u7684\u6570\u91cf\uff0c\u5e76\u5408\u8ba1\u603b\u91cf\r\nSELECT IFNULL(note,'\u5408\u8ba1\u603b\u91cf') AS note,COUNT(*)\r\nFROM books\r\nGROUP BY note WITH ROLLUP;\r\n# 20\u3001\u7edf\u8ba1\u5e93\u5b58\u91cf\u524d\u4e09\u540d\u7684\u56fe\u4e66\r\nSELECT *\r\nFROM books\r\nORDER BY num DESC\r\nLIMIT 0,3;\r\n\r\n# 21\u3001\u627e\u51fa\u6700\u65e9\u51fa\u7248\u7684\u4e00\u672c\u4e66\r\nSELECT *\r\nFROM books\r\nORDER BY pubdate ASC\r\nLIMIT 0,1;\r\n\r\n# 22\u3001\u627e\u51fanovel\u4e2d\u4ef7\u683c\u6700\u9ad8\u7684\u4e00\u672c\u4e66\r\nSELECT *\r\nFROM books\r\nWHERE note = 'novel'\r\nORDER BY price DESC\r\nLIMIT 0,1;\r\n\r\n# 23\u3001\u627e\u51fa\u4e66\u540d\u4e2d\u5b57\u6570\u6700\u591a\u7684\u4e00\u672c\u4e66\uff0c\u4e0d\u542b\u7a7a\u683c\r\nSELECT *\r\nFROM books\r\nORDER BY CHAR_LENGTH(REPLACE(name,' ','')) DESC\r\nLIMIT 0,1;\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[47],"class_list":["post-1538","post","type-post","status-publish","format-standard","hentry","category-mysql-code","tag-mysql"],"_links":{"self":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1538"}],"collection":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1538"}],"version-history":[{"count":1,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1538\/revisions"}],"predecessor-version":[{"id":1539,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1538\/revisions\/1539"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1538"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1538"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1538"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}