{"id":1495,"date":"2022-11-06T23:11:25","date_gmt":"2022-11-06T15:11:25","guid":{"rendered":"https:\/\/qaqaq.top\/?p=1495"},"modified":"2022-11-27T12:40:59","modified_gmt":"2022-11-27T04:40:59","slug":"%e4%b8%ba%e4%bb%80%e4%b9%88%e9%9c%80%e8%a6%81%e5%a4%9a%e8%a1%a8%e7%9a%84%e6%9f%a5%e8%af%a2%e3%80%81%e7%ac%9b%e5%8d%a1%e5%b0%94%e7%a7%af%e7%9a%84%e9%94%99%e8%af%af%e4%b8%8e%e6%ad%a3%e7%a1%ae%e7%9a%84","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=1495","title":{"rendered":"\u4e3a\u4ec0\u4e48\u9700\u8981\u591a\u8868\u7684\u67e5\u8be2\u3001\u7b1b\u5361\u5c14\u79ef\u7684\u9519\u8bef\u4e0e\u6b63\u786e\u7684\u591a\u8868\u67e5\u8be2\u3001\u7b49\u503c\u8fde\u63a5vs\u975e\u7b49\u503c\u8fde\u63a5\u3001\u81ea\u8fde\u63a5vs\u975e\u81ea\u8fde\u63a5\u3001SQL92\u4e0e99\u8bed\u6cd5\u5982\u4f55\u5b9e\u73b0\u5185\u8fde\u63a5\u548c\u5916\u8fde\u63a5\u3001\u4f7f\u7528SQL99\u5b9e\u73b07\u79cdJOIN\u64cd\u4f5c\u3001NATURAL JOIN\u4e0eUSING\u7684\u4f7f\u7528"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code># \u7b2c06\u7ae0_\u591a\u8868\u67e5\u8be2\r\n\r\n\/*\r\n SELECT ....,....,....\r\n FROM ....\r\n WHERE .... AND \/ OR \/ NOT....\r\n ORDER BY .... (ASC\/DESC)....,....\r\n LIMIT ....,....\r\n\r\n *\/\r\n#1. \u719f\u6089\u5e38\u89c1\u7684\u51e0\u4e2a\u8868\r\nDESC employees;\r\n\r\nDESC departments;\r\n\r\nDESC locations;\r\n\r\n# \u67e5\u8be2\u5458\u5de5\u540d\u4e3a'Abel'\u7684\u4eba\u5728\u54ea\u4e2a\u57ce\u5e02\u5de5\u4f5c\uff1f\r\nSELECT *\r\nFROM employees\r\nWHERE last_name = 'Abel';\r\n\r\nSELECT *\r\nFROM departments\r\nWHERE department_id = 80;\r\n\r\nSELECT *\r\nFROM locations\r\nWHERE location_id = 2500;\r\n\r\n# 2. \u51fa\u73b0\u7b1b\u5361\u5c14\u79ef\u7684\u9519\u8bef\r\n# \u9519\u8bef\u7684\u539f\u56e0\uff1a\u7f3a\u5c11\u4e86\u591a\u8868\u7684\u8fde\u63a5\u6761\u4ef6\r\n\r\n# \u9519\u8bef\u7684\u5b9e\u73b0\u65b9\u5f0f\uff1a\u6bcf\u4e2a\u5458\u5de5\u90fd\u4e0e\u6bcf\u4e2a\u90e8\u95e8\u5339\u914d\u4e86\u4e00\u904d\u3002\r\nSELECT employee_id,department_name\r\nFROM employees,departments; #\u67e5\u8be2\u51fa2889\u6761\u8bb0\u5f55\r\n\r\n#\u9519\u8bef\u7684\u65b9\u5f0f\r\nSELECT employee_id,department_name\r\nFROM employees CROSS JOIN departments;  #\u67e5\u8be2\u51fa2889\u6761\u8bb0\u5f55\r\n\r\n\r\nSELECT *\r\nFROM employees;     #107\u6761\u8bb0\u5f55\r\n\r\nSELECT 2889 \/ 107\r\nFROM dual;\r\n\r\nSELECT *\r\nFROM departments;   #27\u6761\u8bb0\u5f55\r\n\r\n# 3. \u591a\u8868\u67e5\u8be2\u7684\u6b63\u786e\u65b9\u5f0f\uff1a\u9700\u8981\u6709\u8fde\u63a5\u6761\u4ef6\r\n\r\nSELECT employee_id,department_name\r\nFROM employees,departments\r\n#\u4e24\u4e2a\u8868\u7684\u8fde\u63a5\u6761\u4ef6\r\nWHERE employees.department_id = departments.department_id;\r\n\r\n# 4. \u5982\u679c\u67e5\u8be2\u8bed\u53e5\u4e2d\u51fa\u73b0\u4e86\u591a\u4e2a\u8868\u4e2d\u90fd\u5b58\u5728\u7684\u5b57\u6bb5\uff0c\u5219\u5fc5\u987b\u6307\u660e\u6b64\u5b57\u6bb5\u6240\u5728\u7684\u8868\u3002\r\nSELECT employees.employee_id,departments.department_name,employees.department_id\r\nFROM employees,departments\r\nWHERE employees.department_id = departments.department_id;\r\n\r\n# \u5efa\u8bae\uff1a\u4ecesql\u4f18\u5316\u7684\u89d2\u5ea6\uff0c\u5efa\u8bae\u591a\u8868\u67e5\u8be2\u65f6\uff0c\u6bcf\u4e2a\u5b57\u6bb5\u524d\u90fd\u6307\u660e\u5176\u6240\u5728\u7684\u8868\u3002\r\n\r\n# 5. \u53ef\u4ee5\u7ed9\u8868\u8d77\u522b\u540d\uff0c\u5728SELECT\u548cWHERE\u4e2d\u4f7f\u7528\u8868\u7684\u522b\u540d\u3002\r\nSELECT emp.employee_id,dept.department_name,emp.department_id\r\nFROM employees emp,departments dept\r\nWHERE emp.department_id = dept.department_id;\r\n\r\n#\u5982\u679c\u7ed9\u8868\u8d77\u4e86\u522b\u540d\uff0c\u4e00\u65e6\u5728SELECT\u6216WHERE\u4e2d\u4f7f\u7528\u8868\u540d\u7684\u8bdd\uff0c\u5219\u5fc5\u987b\u4f7f\u7528\u8868\u7684\u522b\u540d\u3001\u800c\u4e0d\u80fd\u518d\u4f7f\u7528\u8868\u7684\u539f\u540d\u3002\r\n#\u5982\u4e0b\u7684\u64cd\u4f5c\u65f6\u9519\u8bef\u7684\uff1a\r\nSELECT emp.employee_id,departments.department_name,emp.department_id\r\nFROM employees emp,departments dept\r\nWHERE emp.department_id = departments.department_id;\r\n\r\n# 6. \u7ed3\u8bba\uff1a \u5982\u679c\u6709n\u4e2a\u8868\u5b9e\u73b0\u591a\u8868\u7684\u67e5\u8be2\uff0c\u5219\u9700\u8981\u81f3\u5c11n-1\u4e2a\u8fde\u63a5\u6761\u4ef6\r\n#\u7ec3\u4e60\uff1a\u67e5\u8be2\u5458\u5de5\u7684employee_id,last_name,department_name,city\r\nSELECT e.employee_id,e.last_name,d.department_name,l.city,e.department_id,l.location_id\r\nFROM employees e,departments d,locations l\r\nWHERE e.department_id = d.department_id\r\nAND d.location_id = l.location_id;\r\n\r\n\/*\r\n \u6f14\u7ece\u5f0f\uff1a\u63d0\u51fa\u95ee\u98981 ---> \u89e3\u51b3\u95ee\u98981 ---> \u63d0\u51fa\u95ee\u98982 ---> \u89e3\u51b3\u95ee\u98982 ....\r\n\r\n \u5f52\u7eb3\u5f0f\uff1a\u603b -- \u5206\r\n\r\n *\/\r\n\r\n# 7. \u591a\u8868\u67e5\u8be2\u7684\u5206\u7c7b\r\n\r\n\/*\r\n\r\n \u89d2\u5ea61\uff1a\u7b49\u503c\u8fde\u63a5 vs \u975e\u7b49\u503c\u8fde\u63a5\r\n\r\n \u89d2\u5ea62\uff1a\u81ea\u8fde\u63a5 vs \u975e\u81ea\u8fde\u63a5\r\n\r\n \u89d2\u5ea63\uff1a\u5185\u8fde\u63a5 vs \u5916\u8fde\u63a5\r\n\r\n *\/\r\n\r\n# 7.1 \u7b49\u503c\u8fde\u63a5 vs \u975e\u7b49\u503c\u8fde\u63a5\r\n\r\n# \u975e\u7b49\u503c\u8fde\u63a5\u7684\u4f8b\u5b50\uff1a\r\nSELECT *\r\nFROM job_grades;\r\n\r\nSELECT e.last_name,e.salary,j.grade_level\r\nFROM employees e, job_grades j\r\n# WHERE e.salary BETWEEN J.lowest_sal AND J.highest_sal\r\nWHERE e.salary >= j.lowest_sal AND e.salary &lt;= j.highest_sal;\r\n\r\n# 7.2 \u81ea\u8fde\u63a5 vs \u975e\u81ea\u8fde\u63a5\r\n\r\nSELECT * FROM employees;\r\n\r\n#\u81ea\u8fde\u63a5\u7684\u4f8b\u5b50\uff1a\r\n#\u7ec3\u4e60\uff1a\u67e5\u8be2\u5458\u5de5id\uff0c\u5458\u5de5\u59d3\u540d\u53ca\u5176\u7ba1\u7406\u8005\u7684id\u548c\u59d3\u540d\r\n\r\nSELECT emp.employee_id,emp.last_name,mgr.employee_id,mgr.last_name\r\nFROM employees emp,employees mgr\r\nWHERE emp.manager_id = mgr.employee_id;\r\n\r\n# 7.3 \u5185\u8fde\u63a5 vs \u5916\u8fde\u63a5\r\n\r\n# \u5185\u8fde\u63a5\uff1a\u5408\u5e76\u5177\u6709\u540c\u4e00\u5217\u7684\u4e24\u4e2a\u4ee5\u4e0a\u7684\u8868\u7684\u884c, \u7ed3\u679c\u96c6\u4e2d\u4e0d\u5305\u542b\u4e00\u4e2a\u8868\u4e0e\u53e6\u4e00\u4e2a\u8868\u4e0d\u5339\u914d\u7684\u884c\r\nSELECT e.employee_id,d.department_name\r\nFROM employees e,departments d\r\nWHERE e.department_id = d.department_id;    #\u53ea\u6709106\u6761\u8bb0\u5f55\r\n\r\n# \u5916\u8fde\u63a5\uff1a\u5408\u5e76\u5177\u6709\u540c\u4e00\u5217\u7684\u4e24\u4e2a\u4ee5\u4e0a\u7684\u8868\u7684\u884c\uff0c\u7ed3\u679c\u96c6\u4e2d\u9664\u4e86\u5305\u542b\u4e00\u4e2a\u8868\u4e0e\u53e6\u4e00\u4e2a\u8868\u5339\u914d\u7684\u884c\u4e4b\u5916\uff0c\r\n#         \u8fd8\u67e5\u8be2\u5230\u4e86\u5de6\u8868 \u6216 \u53f3\u8868\u4e2d\u4e0d\u5339\u914d\u7684\u884c\u3002\r\n\r\n# \u5916\u8fde\u63a5\u7684\u5206\u7c7b\uff1a\u5de6\u5916\u8fde\u63a5\u3001\u53f3\u5916\u8fde\u63a5\u3001\u6ee1\u5916\u8fde\u63a5\r\n\r\n# \u5de6\u5916\u8fde\u63a5\uff1a\u4e24\u4e2a\u8868\u5728\u8fde\u63a5\u8fc7\u7a0b\u4e2d\u9664\u4e86\u8fd4\u56de\u6ee1\u8db3\u8fde\u63a5\u6761\u4ef6\u7684\u884c\u4ee5\u5916\u8fd8\u8fd4\u56de\u5de6\u8868\u4e2d\u4e0d\u6ee1\u8db3\u6761\u4ef6\u7684\u884c\u8fd9\u79cd\u8fde\u63a5\u79f0\u4e3a\u5de6\u5916\u8fde\u63a5\u3002\r\n# \u53f3\u5916\u8fde\u63a5\uff1a\u4e24\u4e2a\u8868\u5728\u8fde\u63a5\u8fc7\u7a0b\u4e2d\u9664\u4e86\u8fd4\u56de\u6ee1\u8db3\u8fde\u63a5\u6761\u4ef6\u7684\u884c\u4ee5\u5916\u8fd8\u8fd4\u56de\u53f3\u8868\u4e2d\u4e0d\u6ee1\u8db3\u6761\u4ef6\u7684\u884c\u8fd9\u79cd\u8fde\u63a5\u79f0\u4e3a\u53f3\u5916\u8fde\u63a5\u3002\r\n\r\n#\u7ec3\u4e60\uff1a\u67e5\u8be2\u6240\u6709\u7684\u5458\u5de5\u7684last_name,department_name\u4fe1\u606f\r\nSELECT e.employee_id,d.department_name\r\nFROM employees e,departments d\r\nWHERE e.department_id = d.department_id;    # \u9700\u8981\u4f7f\u7528\u5de6\u5916\u8fde\u63a5\r\n\r\n#SQL92\u8bed\u6cd5\u5b9e\u73b0\u5185\u8fde\u63a5\uff1a\u89c1\u4e0a\uff0c\u7565\r\n#SQL92\u8bed\u6cd5\u5b9e\u73b0\u5916\u8fde\u63a5\uff1a\u4f7f\u7528 +  ---------------MySQL\u4e0d\u652f\u6301SQL92\u8bed\u6cd5\u4e2d\u5916\u8fde\u63a5\u7684\u5199\u6cd5\uff01\r\n#\u4e0d\u652f\u6301\uff1a\r\nSELECT e.employee_id,d.department_name\r\nFROM employees e,departments d\r\nWHERE e.department_id = d.department_id(+);\r\n\r\n#SQL99\u8bed\u6cd5\u4e2d\u4f7f\u7528JOIN ... ON \u7684\u65b9\u5f0f\u5b9e\u73b0\u591a\u8868\u7684\u67e5\u8be2\u3002\u8fd9\u79cd\u65b9\u5f0f\u4e5f\u80fd\u89e3\u51b3\u5916\u8fde\u63a5\u7684\u95ee\u9898\u3002MySQL\u662f\u652f\u6301\u6b64\u79cd\u65b9\u5f0f\u7684\u3002\r\n#SQL99\u8bed\u6cd5\u5982\u4f55\u5b9e\u73b0\u591a\u8868\u7684\u67e5\u8be2\u3002\r\n\r\n#SQL99\u8bed\u6cd5\u5b9e\u73b0\u5185\u8fde\u63a5\uff1a\r\nSELECT last_name,department_name\r\nFROM employees e INNER JOIN departments d\r\nON e.department_id = d.department_id;\r\n\r\nSELECT last_name,department_name,city\r\nFROM employees e JOIN departments d\r\nON e.department_id = d.department_id\r\nJOIN locations l\r\nON d.location_id = l.location_id;\r\n\r\n#SQL99\u8bed\u6cd5\u5b9e\u73b0\u5916\u8fde\u63a5\uff1a\r\n\r\n#\u7ec3\u4e60\uff1a\u67e5\u8be2\u6240\u6709\u7684\u5458\u5de5\u7684last_name,department_name\u4fe1\u606f\r\n\r\nSELECT last_name,department_name\r\nFROM employees e LEFT JOIN departments d\r\nON e.department_id = d.department_id;\r\n\r\n# \u53f3\u5916\u8fde\u63a5\uff1a\r\nSELECT last_name,department_name\r\nFROM employees e RIGHT OUTER JOIN departments d\r\nON e.department_id = d.department_id;\r\n\r\n# \u6ee1\u5916\u8fde\u63a5\uff1amysql\u4e0d\u652f\u6301FULL OUTER JOIN\r\nSELECT last_name,department_name\r\nFROM employees e FULL OUTER JOIN departments d\r\nON e.department_id = d.department_id;\r\n\r\n# 8. UNION \u548c UNION ALL\u7684\u4f7f\u7528\r\n# UNION: \u4f1a\u6267\u884c\u53bb\u91cd\u64cd\u4f5c\r\n# UNION ALL: \u4e0d\u4f1a\u6267\u884c\u53bb\u91cd\u64cd\u4f5c\r\n# \u7ed3\u8bba\uff1a\u5982\u679c\u660e\u786e\u77e5\u9053\u5408\u5e76\u6570\u636e\u540e\u7684\u7ed3\u679c\u6570\u636e\u4e0d\u5b58\u5728\u91cd\u590d\u6570\u636e\uff0c\u6216\u8005\u4e0d\u9700\u8981\u53bb\u9664\u91cd\u590d\u7684\u6570\u636e\uff0c\r\n# \u5219\u5c3d\u91cf\u4f7f\u7528UNION ALL\u8bed\u53e5\uff0c\u4ee5\u63d0\u9ad8\u6570\u636e\u67e5\u8be2\u7684\u6548\u7387\u3002\r\n\r\n# 9. 7\u79cdJOIN\u7684\u5b9e\u73b0\uff1a\r\n\r\n# \u4e2d\u56fe\uff1a\u5185\u8fde\u63a5\r\nSELECT employee_id,department_name\r\nFROM employees e JOIN departments d\r\nON e.department_id = d.department_id;\r\n\r\n# \u5de6\u4e0a\u56fe\uff1a\u5de6\u5916\u8fde\u63a5\r\nSELECT employee_id,department_name\r\nFROM employees e LEFT JOIN departments d\r\nON e.department_id = d.department_id;\r\n\r\n# \u53f3\u4e0a\u56fe\uff1a\u53f3\u5916\u8fde\u63a5\r\nSELECT employee_id,department_name\r\nFROM employees e RIGHT JOIN departments d\r\nON e.department_id = d.department_id;\r\n\r\n# \u5de6\u4e2d\u56fe\uff1a\r\nSELECT employee_id,department_name\r\nFROM employees e LEFT JOIN departments d\r\nON e.department_id = d.department_id\r\nWHERE d.department_id IS NULL;\r\n\r\n# \u53f3\u4e2d\u56fe\uff1a\r\nSELECT employee_id,department_name\r\nFROM employees e RIGHT JOIN departments d\r\nON e.department_id = d.department_id\r\nWHERE e.department_id IS NULL;\r\n\r\n# \u5de6\u4e0b\u56fe\uff1a\u6ee1\u5916\u8fde\u63a5\r\n# \u65b9\u5f0f1\uff1a\u5de6\u4e0a\u56fe UNION ALL \u53f3\u4e2d\u56fe\r\nSELECT employee_id,department_name\r\nFROM employees e LEFT JOIN departments d\r\nON e.department_id = d.department_id\r\nUNION ALL\r\nSELECT employee_id,department_name\r\nFROM employees e RIGHT JOIN departments d\r\nON e.department_id = d.department_id\r\nWHERE e.department_id IS NULL;\r\n\r\n# \u65b9\u5f0f2\uff1a\u5de6\u4e2d\u56fe UNION ALL \u53f3\u4e0a\u56fe\r\nSELECT employee_id,department_name\r\nFROM employees e LEFT JOIN departments d\r\nON e.department_id = d.department_id\r\nWHERE d.department_id IS NULL\r\nUNION ALL\r\nSELECT employee_id,department_name\r\nFROM employees e RIGHT JOIN departments d\r\nON e.department_id = d.department_id;\r\n\r\n# \u53f3\u4e0b\u56fe\uff1a\u5de6\u4e2d\u56fe UNION ALL \u53f3\u4e2d\u56fe\r\nSELECT employee_id,department_name\r\nFROM employees e LEFT JOIN departments d\r\nON e.department_id = d.department_id\r\nWHERE d.department_id IS NULL\r\nUNION ALL\r\nSELECT employee_id,department_name\r\nFROM employees e RIGHT JOIN departments d\r\nON e.department_id = d.department_id\r\nWHERE e.department_id IS NULL;\r\n\r\n# 10. SQL99\u8bed\u6cd5\u7684\u65b0\u7279\u60271: \u81ea\u7136\u8fde\u63a5\r\n\r\nSELECT employee_id,last_name,department_name,d.department_id,d.manager_id\r\nFROM employees e JOIN departments d\r\nON e.`department_id` = d.`department_id`\r\nAND e.`manager_id` = d.`manager_id`;\r\n\r\n# NATURAL JOIN : \u5b83\u4f1a\u5e2e\u4f60\u81ea\u52a8\u67e5\u8be2\u4e24\u5f20\u8fde\u63a5\u8868\u4e2d\u6240\u6709\u76f8\u540c\u7684\u5b57\u6bb5\uff0c\u7136\u540e\u8fdb\u884c\u7b49\u503c\u8fde\u63a5 \u3002\r\nSELECT employee_id,last_name,department_name\r\nFROM employees e NATURAL JOIN departments d;\r\n\r\n# 11. SQL99\u8bed\u6cd5\u7684\u65b0\u7279\u60272:USING\r\nSELECT employee_id,last_name,department_name\r\nFROM employees e JOIN departments d\r\nON e.department_id = d.department_id;\r\n\r\nSELECT employee_id,last_name,department_name\r\nFROM employees e JOIN departments d\r\nUSING (department_id);\r\n\r\n#\u62d3\u5c55\uff1a\r\nSELECT last_name,job_title,department_name\r\nFROM employees INNER JOIN departments INNER JOIN jobs\r\nON employees.department_id = departments.department_id\r\nAND employees.job_id = jobs.job_id;<\/code><\/pre>\n\n\n\n<p>SQL JOINS<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/SQL-JOINS.png'><img class=\"lazyload lazyload-style-1\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  loading=\"lazy\" decoding=\"async\" width=\"760\" height=\"478\" data-original=\"https:\/\/qaqaq.top\/wp-content\/uploads\/2022\/11\/SQL-JOINS.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"\" class=\"wp-image-1510\"  sizes=\"(max-width: 760px) 100vw, 760px\" \/><\/div><\/figure>\n\n\n\n<p>\u7ec3\u4e60\u6570\u636e<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE TABLE `t_dept` (\n`id` INT(11) NOT NULL AUTO_INCREMENT,\n`deptName` VARCHAR(30) DEFAULT NULL,\n`address` VARCHAR(40) DEFAULT NULL,\nPRIMARY KEY (`id`)\n) ENGINE=INNODB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;\n\nCREATE TABLE `t_emp` (\n`id` INT(11) NOT NULL AUTO_INCREMENT,\n`name` VARCHAR(20) DEFAULT NULL,\n`age` INT(3) DEFAULT NULL,\n`deptId` INT(11) DEFAULT NULL,\nempno INT NOT NULL ,\nPRIMARY KEY (`id`),\nKEY `idx_dept_id` (`deptId`)\n#CONSTRAINT `fk_dept_id` FOREIGN KEY (`deptId`) REFERENCES `t_dept` (`id`)\n) ENGINE=INNODB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;\n\nINSERT INTO t_dept(deptName,address) VALUES('\u534e\u5c71','\u534e\u5c71');\nINSERT INTO t_dept(deptName,address) VALUES('\u4e10\u5e2e','\u6d1b\u9633');\nINSERT INTO t_dept(deptName,address) VALUES('\u5ce8\u7709','\u5ce8\u7709\u5c71');\nINSERT INTO t_dept(deptName,address) VALUES('\u6b66\u5f53','\u6b66\u5f53\u5c71');\nINSERT INTO t_dept(deptName,address) VALUES('\u660e\u6559','\u5149\u660e\u9876');\nINSERT INTO t_dept(deptName,address) VALUES('\u5c11\u6797','\u5c11\u6797\u5bfa');\nINSERT INTO t_emp(NAME,age,deptId,empno) VALUES('\u98ce\u6e05\u626c',90,1,100001);\nINSERT INTO t_emp(NAME,age,deptId,empno) VALUES('\u5cb3\u4e0d\u7fa4',50,1,100002);\nINSERT INTO t_emp(NAME,age,deptId,empno) VALUES('\u4ee4\u72d0\u51b2',24,1,100003);\nINSERT INTO t_emp(NAME,age,deptId,empno) VALUES('\u6d2a\u4e03\u516c',70,2,100004);\nINSERT INTO t_emp(NAME,age,deptId,empno) VALUES('\u4e54\u5cf0',35,2,100005);\nINSERT INTO t_emp(NAME,age,deptId,empno) VALUES('\u706d\u7edd\u5e08\u592a',70,3,100006);\nINSERT INTO t_emp(NAME,age,deptId,empno) VALUES('\u5468\u82b7\u82e5',20,3,100007);\nINSERT INTO t_emp(NAME,age,deptId,empno) VALUES('\u5f20\u4e09\u4e30',100,4,100008);\nINSERT INTO t_emp(NAME,age,deptId,empno) VALUES('\u5f20\u65e0\u5fcc',25,5,100009);\nINSERT INTO t_emp(NAME,age,deptId,empno) VALUES('\u97e6\u5c0f\u5b9d',18,null,100010);<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>SQL JOINS \u7ec3\u4e60\u6570\u636e<\/p>\n","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-1495","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\/1495"}],"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=1495"}],"version-history":[{"count":3,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1495\/revisions"}],"predecessor-version":[{"id":1513,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1495\/revisions\/1513"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1495"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1495"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1495"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}