{"id":526,"date":"2010-10-04T16:15:37","date_gmt":"2010-10-04T16:15:37","guid":{"rendered":""},"modified":"2010-10-04T16:15:37","modified_gmt":"2010-10-04T16:15:37","slug":"526","status":"publish","type":"post","link":"https:\/\/www.poloo.org\/?p=526","title":{"rendered":"MySQL \u6570\u636e\u5e93\u4f18\u5316\u65b9\u6cd5"},"content":{"rendered":"

\u6765\u770b\u770b\u4e00\u4e9b\u5e38\u7528\u7684 MySQL \u6570\u636e\u5e93\u4f18\u5316\u65b9\u6cd5\uff1a
1\uff0c\u9009\u53d6\u6700\u9002\u7528\u7684\u5b57\u6bb5\u5c5e\u6027
MySQL \u53ef\u4ee5\u5f88\u597d\u7684\u652f\u6301\u5927\u6570\u636e\u91cf\u7684\u5b58\u53d6\uff0c\u4f46\u662f\u4e00\u822c\u8bf4\u6765\uff0c\u6570\u636e\u5e93\u4e2d\u7684\u8868\u8d8a\u5c0f\uff0c\u5728\u5b83\u4e0a\u9762\u6267\u884c\u7684\u67e5\u8be2\u4e5f\u5c31\u4f1a\u8d8a\u5feb\u3002\u56e0\u6b64\uff0c\u5728\u521b\u5efa\u8868\u7684\u65f6\u5019\uff0c\u4e3a\u4e86\u83b7\u5f97\u66f4\u597d\u7684\u6027\u80fd\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u8868\u4e2d\u5b57\u6bb5\u7684\u5bbd\u5ea6\u8bbe\u5f97\u5c3d\u53ef\u80fd\u5c0f\u3002\u4f8b\u5982\uff0c\u5728\u5b9a\u4e49\u90ae\u653f\u7f16\u7801\u8fd9\u4e2a\u5b57\u6bb5\u65f6\uff0c\u5982\u679c\u5c06\u5176\u8bbe\u7f6e\u4e3a CHAR(255),\u663e\u7136\u7ed9\u6570\u636e\u5e93\u589e\u52a0\u4e86\u4e0d\u5fc5\u8981\u7684\u7a7a\u95f4\uff0c\u751a\u81f3\u4f7f\u7528 VARCHAR \u8fd9\u79cd\u7c7b\u578b\u4e5f\u662f\u591a\u4f59\u7684\uff0c\u56e0\u4e3a CHAR(6) \u5c31\u53ef\u4ee5\u5f88\u597d\u7684\u5b8c\u6210\u4efb\u52a1\u4e86\u3002\u540c\u6837\u7684\uff0c\u5982\u679c\u53ef\u4ee5\u7684\u8bdd\uff0c\u6211\u4eec\u5e94\u8be5\u4f7f\u7528 MEDIUMINT \u800c\u4e0d\u662f BIGIN \u6765\u5b9a\u4e49\u6574\u578b\u5b57\u6bb5\u3002
\u53e6\u5916\u4e00\u4e2a\u63d0\u9ad8\u6548\u7387\u7684\u65b9\u6cd5\u662f\u5728\u53ef\u80fd\u7684\u60c5\u51b5\u4e0b\uff0c\u5e94\u8be5\u5c3d\u91cf\u628a\u5b57\u6bb5\u8bbe\u7f6e\u4e3a NOT NULL\uff0c\u8fd9\u6837\u5728\u5c06\u6765\u6267\u884c\u67e5\u8be2\u7684\u65f6\u5019\uff0c\u6570\u636e\u5e93\u4e0d\u7528\u53bb\u6bd4\u8f83 NULL \u503c\u3002
      \u5bf9\u4e8e\u67d0\u4e9b\u6587\u672c\u5b57\u6bb5\uff0c\u4f8b\u5982\u201c\u7701\u4efd\u201d\u6216\u8005\u201c\u6027\u522b\u201d\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u5b83\u4eec\u5b9a\u4e49\u4e3a ENUM \u7c7b\u578b\u3002\u56e0\u4e3a\u5728MySQL \u4e2d\uff0cENUM \u7c7b\u578b\u88ab\u5f53\u4f5c\u6570\u503c\u578b\u6570\u636e\u6765\u5904\u7406\uff0c\u800c\u6570\u503c\u578b\u6570\u636e\u88ab\u5904\u7406\u8d77\u6765\u7684\u901f\u5ea6\u8981\u6bd4\u6587\u672c\u7c7b\u578b\u5feb\u5f97\u591a\u3002\u8fd9\u6837\uff0c\u6211\u4eec\u53c8\u53ef\u4ee5\u63d0\u9ad8\u6570\u636e\u5e93\u7684\u6027\u80fd\u3002
2\uff0c\u4f7f\u7528\u8fde\u63a5\uff08JOIN\uff09\u6765\u4ee3\u66ff\u5b50\u67e5\u8be2(Sub-Queries)
      MySQL \u4ece 4.1 \u5f00\u59cb\u652f\u6301 SQL \u7684\u5b50\u67e5\u8be2\u3002\u8fd9\u4e2a\u6280\u672f\u53ef\u4ee5\u4f7f\u7528 Select \u8bed\u53e5\u6765\u521b\u5efa\u4e00\u4e2a\u5355\u5217\u7684\u67e5\u8be2\u7ed3\u679c\uff0c\u7136\u540e\u628a\u8fd9\u4e2a\u7ed3\u679c\u4f5c\u4e3a\u8fc7\u6ee4\u6761\u4ef6\u7528\u5728\u53e6\u4e00\u4e2a\u67e5\u8be2\u4e2d\u3002\u4f8b\u5982\uff0c\u6211\u4eec\u8981\u5c06\u5ba2\u6237\u57fa\u672c\u4fe1\u606f\u8868\u4e2d\u6ca1\u6709\u4efb\u4f55\u8ba2\u5355\u7684\u5ba2\u6237\u5220\u9664\u6389\uff0c\u5c31\u53ef\u4ee5\u5229\u7528\u5b50\u67e5\u8be2\u5148\u4ece\u9500\u552e\u4fe1\u606f\u8868\u4e2d\u5c06\u6240\u6709\u53d1\u51fa\u8ba2\u5355\u7684\u5ba2\u6237ID\u53d6\u51fa\u6765\uff0c\u7136\u540e\u5c06\u7ed3\u679c\u4f20\u9012\u7ed9\u4e3b\u67e5\u8be2\uff0c\u5982\u4e0b\u6240\u793a\uff1a

Delete FROM customerinfo Where CustomerID NOT in (Select CustomerID FROM salesinfo )
<\/code><\/p>\n

\u4f7f\u7528\u5b50\u67e5\u8be2\u53ef\u4ee5\u4e00\u6b21\u6027\u7684\u5b8c\u6210\u5f88\u591a\u903b\u8f91\u4e0a\u9700\u8981\u591a\u4e2a\u6b65\u9aa4\u624d\u80fd\u5b8c\u6210\u7684SQL\u64cd\u4f5c\uff0c\u540c\u65f6\u4e5f\u53ef\u4ee5\u907f\u514d\u4e8b\u52a1\u6216\u8005\u8868\u9501\u6b7b\uff0c\u5e76\u4e14\u5199\u8d77\u6765\u4e5f\u5f88\u5bb9\u6613\u3002\u4f46\u662f\uff0c\u6709\u4e9b\u60c5\u51b5\u4e0b\uff0c\u5b50\u67e5\u8be2\u53ef\u4ee5\u88ab\u66f4\u6709\u6548\u7387\u7684\u8fde\u63a5\uff08JOIN\uff09.. \u66ff\u4ee3\u3002\u4f8b\u5982\uff0c\u5047\u8bbe\u6211\u4eec\u8981\u5c06\u6240\u6709\u6ca1\u6709\u8ba2\u5355\u8bb0\u5f55\u7684\u7528\u6237\u53d6\u51fa\u6765\uff0c\u53ef\u4ee5\u7528\u4e0b\u9762\u8fd9\u4e2a\u67e5\u8be2\u5b8c\u6210\uff1a

Select * FROM customerinfo Where CustomerID NOT in (Select CustomerID FROM salesinfo )
<\/code><\/p>\n

\u5982\u679c\u4f7f\u7528\u8fde\u63a5\uff08JOIN\uff09.. \u6765\u5b8c\u6210\u8fd9\u4e2a\u67e5\u8be2\u5de5\u4f5c\uff0c\u901f\u5ea6\u5c06\u4f1a\u5feb\u5f88\u591a\u3002\u5c24\u5176\u662f\u5f53salesinfo\u8868\u4e2d\u5bf9CustomerID\u5efa\u6709\u7d22\u5f15\u7684\u8bdd\uff0c\u6027\u80fd\u5c06\u4f1a\u66f4\u597d\uff0c\u67e5\u8be2\u5982\u4e0b\uff1a

Select * FROM customerinfo
LEFT JOIN salesinfo ON customerinfo.CustomerID=salesinfo.CustomerID
Where salesinfo.CustomerID IS NULL
<\/code><\/p>\n

\u8fde\u63a5\uff08JOIN\uff09.. \u4e4b\u6240\u4ee5\u66f4\u6709\u6548\u7387\u4e00\u4e9b\uff0c\u662f\u56e0\u4e3a MySQL \u4e0d\u9700\u8981\u5728\u5185\u5b58\u4e2d\u521b\u5efa\u4e34\u65f6\u8868\u6765\u5b8c\u6210\u8fd9\u4e2a\u903b\u8f91\u4e0a\u7684\u9700\u8981\u4e24\u4e2a\u6b65\u9aa4\u7684\u67e5\u8be2\u5de5\u4f5c\u3002
3\uff0c\u4f7f\u7528\u8054\u5408(UNION)\u6765\u4ee3\u66ff\u624b\u52a8\u521b\u5efa\u7684\u4e34\u65f6\u8868
      MySQL \u4ece 4.0 \u7684\u7248\u672c\u5f00\u59cb\u652f\u6301 UNION \u67e5\u8be2\uff0c\u5b83\u53ef\u4ee5\u628a\u9700\u8981\u4f7f\u7528\u4e34\u65f6\u8868\u7684\u4e24\u6761\u6216\u66f4\u591a\u7684 Select \u67e5\u8be2\u5408\u5e76\u7684\u4e00\u4e2a\u67e5\u8be2\u4e2d\u3002\u5728\u5ba2\u6237\u7aef\u7684\u67e5\u8be2\u4f1a\u8bdd\u7ed3\u675f\u7684\u65f6\u5019\uff0c\u4e34\u65f6\u8868\u4f1a\u88ab\u81ea\u52a8\u5220\u9664\uff0c\u4ece\u800c\u4fdd\u8bc1\u6570\u636e\u5e93\u6574\u9f50\u3001\u9ad8\u6548\u3002\u4f7f\u7528 UNION \u6765\u521b\u5efa\u67e5\u8be2\u7684\u65f6\u5019\uff0c\u6211\u4eec\u53ea\u9700\u8981\u7528 UNION\u4f5c\u4e3a\u5173\u952e\u5b57\u628a\u591a\u4e2a Select \u8bed\u53e5\u8fde\u63a5\u8d77\u6765\u5c31\u53ef\u4ee5\u4e86\uff0c\u8981\u6ce8\u610f\u7684\u662f\u6240\u6709 Select \u8bed\u53e5\u4e2d\u7684\u5b57\u6bb5\u6570\u76ee\u8981\u60f3\u540c\u3002\u4e0b\u9762\u7684\u4f8b\u5b50\u5c31\u6f14\u793a\u4e86\u4e00\u4e2a\u4f7f\u7528 UNION \u7684\u67e5\u8be2\uff1a

Select Name, Phone FROM client
UNION
Select Name, BirthDate FROM author
UNION
Select Name, Supplier FROM product
<\/code><\/p>\n

4\uff0c\u4e8b\u7269
\u5c3d\u7ba1\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5b50\u67e5\u8be2\uff08Sub-Queries\uff09\u3001\u8fde\u63a5\uff08JOIN\uff09\u548c\u8054\u5408\uff08UNION\uff09\u6765\u521b\u5efa\u5404\u79cd\u5404\u6837\u7684\u67e5\u8be2\uff0c\u4f46\u4e0d\u662f\u6240\u6709\u7684\u6570\u636e\u5e93\u64cd\u4f5c\u90fd\u53ef\u4ee5\u53ea\u7528\u4e00\u6761\u6216\u5c11\u6570\u51e0\u6761SQL\u8bed\u53e5\u5c31\u53ef\u4ee5\u5b8c\u6210\u7684\u3002\u66f4\u591a\u7684\u65f6\u5019\u662f\u9700\u8981\u7528\u5230\u4e00\u7cfb\u5217\u7684\u8bed\u53e5\u6765\u5b8c\u6210\u67d0\u79cd\u5de5\u4f5c\u3002\u4f46\u662f\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5f53\u8fd9\u4e2a\u8bed\u53e5\u5757\u4e2d\u7684\u67d0\u4e00\u6761\u8bed\u53e5\u8fd0\u884c\u51fa\u9519\u7684\u65f6\u5019\uff0c\u6574\u4e2a\u8bed\u53e5\u5757\u7684\u64cd\u4f5c\u5c31\u4f1a\u53d8\u5f97\u4e0d\u786e\u5b9a\u8d77\u6765\u3002\u8bbe\u60f3\u4e00\u4e0b\uff0c\u8981\u628a\u67d0\u4e2a\u6570\u636e\u540c\u65f6\u63d2\u5165\u4e24\u4e2a\u76f8\u5173\u8054\u7684\u8868\u4e2d\uff0c\u53ef\u80fd\u4f1a\u51fa\u73b0\u8fd9\u6837\u7684\u60c5\u51b5\uff1a\u7b2c\u4e00\u4e2a\u8868\u4e2d\u6210\u529f\u66f4\u65b0\u540e\uff0c\u6570\u636e\u5e93\u7a81\u7136\u51fa\u73b0\u610f\u5916\u72b6\u51b5\uff0c\u9020\u6210\u7b2c\u4e8c\u4e2a\u8868\u4e2d\u7684\u64cd\u4f5c\u6ca1\u6709\u5b8c\u6210\uff0c\u8fd9\u6837\uff0c\u5c31\u4f1a\u9020\u6210\u6570\u636e\u7684\u4e0d\u5b8c\u6574\uff0c\u751a\u81f3\u4f1a\u7834\u574f\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u3002\u8981\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\uff0c\u5c31\u5e94\u8be5\u4f7f\u7528\u4e8b\u52a1\uff0c\u5b83\u7684\u4f5c\u7528\u662f\uff1a\u8981\u4e48\u8bed\u53e5\u5757\u4e2d\u6bcf\u6761\u8bed\u53e5\u90fd\u64cd\u4f5c\u6210\u529f\uff0c\u8981\u4e48\u90fd\u5931\u8d25\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u5c31\u662f\u53ef\u4ee5\u4fdd\u6301\u6570\u636e\u5e93\u4e2d\u6570\u636e\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u3002\u4e8b\u7269\u4ee5 BEGIN \u5173\u952e\u5b57\u5f00\u59cb\uff0cCOMMIT \u5173\u952e\u5b57\u7ed3\u675f\u3002\u5728\u8fd9\u4e4b\u95f4\u7684\u4e00\u6761 SQL\u64cd\u4f5c\u5931\u8d25\uff0c\u90a3\u4e48\uff0cROLLBACK \u547d\u4ee4\u5c31\u53ef\u4ee5\u628a\u6570\u636e\u5e93\u6062\u590d\u5230BEGIN\u5f00\u59cb\u4e4b\u524d\u7684\u72b6\u6001\uff1a

BEGIN;
Insert INTO salesinfo SET CustomerID=14;
Update inventory SET Quantity=11
Where item='book';
COMMIT;
<\/code><\/p>\n

\u4e8b\u52a1\u7684\u53e6\u4e00\u4e2a\u91cd\u8981\u4f5c\u7528\u662f\u5f53\u591a\u4e2a\u7528\u6237\u540c\u65f6\u4f7f\u7528\u76f8\u540c\u7684\u6570\u636e\u6e90\u65f6\uff0c\u5b83\u53ef\u4ee5\u5229\u7528\u9501\u5b9a\u6570\u636e\u5e93\u7684\u65b9\u6cd5\u6765\u4e3a\u7528\u6237\u63d0\u4f9b\u4e00\u79cd\u5b89\u5168\u7684\u8bbf\u95ee\u65b9\u5f0f\uff0c\u8fd9\u6837\u53ef\u4ee5\u4fdd\u8bc1\u7528\u6237\u7684\u64cd\u4f5c\u4e0d\u88ab\u5176\u5b83\u7684\u7528\u6237\u6240\u5e72\u6270\u3002
\uff15\uff0c\u9501\u5b9a\u8868
      \u5c3d\u7ba1\u4e8b\u52a1\u662f\u7ef4\u62a4\u6570\u636e\u5e93\u5b8c\u6574\u6027\u7684\u4e00\u4e2a\u975e\u5e38\u597d\u7684\u65b9\u6cd5\uff0c\u4f46\u5374\u56e0\u4e3a\u5b83\u7684\u72ec\u5360\u6027\uff0c\u6709\u65f6\u4f1a\u5f71\u54cd\u6570\u636e\u5e93\u7684\u6027\u80fd\uff0c\u5c24\u5176\u662f\u5728\u5f88\u5927\u7684\u5e94\u7528\u7cfb\u7edf\u4e2d\u3002\u7531\u4e8e\u5728\u4e8b\u52a1\u6267\u884c\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6570\u636e\u5e93\u5c06\u4f1a\u88ab\u9501\u5b9a\uff0c\u56e0\u6b64\u5176\u5b83\u7684\u7528\u6237\u8bf7\u6c42\u53ea\u80fd\u6682\u65f6\u7b49\u5f85\u76f4\u5230\u8be5\u4e8b\u52a1\u7ed3\u675f\u3002\u5982\u679c\u4e00\u4e2a\u6570\u636e\u5e93\u7cfb\u7edf\u53ea\u6709\u5c11\u6570\u51e0\u4e2a\u7528\u6237\u6765\u4f7f\u7528\uff0c\u4e8b\u52a1\u9020\u6210\u7684\u5f71\u54cd\u4e0d\u4f1a\u6210\u4e3a\u4e00\u4e2a\u592a\u5927\u7684\u95ee\u9898\uff1b\u4f46\u5047\u8bbe\u6709\u6210\u5343\u4e0a\u4e07\u7684\u7528\u6237\u540c\u65f6\u8bbf\u95ee\u4e00\u4e2a\u6570\u636e\u5e93\u7cfb\u7edf\uff0c\u4f8b\u5982\u8bbf\u95ee\u4e00\u4e2a\u7535\u5b50\u5546\u52a1\u7f51\u7ad9\uff0c\u5c31\u4f1a\u4ea7\u751f\u6bd4\u8f83\u4e25\u91cd\u7684\u54cd\u5e94\u5ef6\u8fdf\u3002
\u5176\u5b9e\uff0c\u6709\u4e9b\u60c5\u51b5\u4e0b\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u9501\u5b9a\u8868\u7684\u65b9\u6cd5\u6765\u83b7\u5f97\u66f4\u597d\u7684\u6027\u80fd\u3002\u4e0b\u9762\u7684\u4f8b\u5b50\u5c31\u7528\u9501\u5b9a\u8868\u7684\u65b9\u6cd5\u6765\u5b8c\u6210\u524d\u9762\u4e00\u4e2a\u4f8b\u5b50\u4e2d\u4e8b\u52a1\u7684\u529f\u80fd\uff1a

LOCK TABLE inventory WRITE
Select Quantity FROM inventory
WHER EItem='book';
...
Update inventory SET Quantity=11
WHER EItem='book';
UNLOCK TABLES
<\/code><\/p>\n

      \u8fd9\u91cc\uff0c\u6211\u4eec\u7528\u4e00\u4e2a Select \u8bed\u53e5\u53d6\u51fa\u521d\u59cb\u6570\u636e\uff0c\u901a\u8fc7\u4e00\u4e9b\u8ba1\u7b97\uff0c\u7528 Update \u8bed\u53e5\u5c06\u65b0\u503c\u66f4\u65b0\u5230\u8868\u4e2d\u3002\u5305\u542b\u6709 WRITE \u5173\u952e\u5b57\u7684 LOCK TABLE \u8bed\u53e5\u53ef\u4ee5\u4fdd\u8bc1\u5728 UNLOCK TABLES \u547d\u4ee4\u88ab\u6267\u884c\u4e4b\u524d\uff0c\u4e0d\u4f1a\u6709\u5176\u5b83\u7684\u8bbf\u95ee\u6765\u5bf9 inventory \u8fdb\u884c\u63d2\u5165\u3001\u66f4\u65b0\u6216\u8005\u5220\u9664\u7684\u64cd\u4f5c\u3002
6\uff0c\u4f7f\u7528\u5916\u952e
      \u9501\u5b9a\u8868\u7684\u65b9\u6cd5\u53ef\u4ee5\u7ef4\u62a4\u6570\u636e\u7684\u5b8c\u6574\u6027\uff0c\u4f46\u662f\u5b83\u5374\u4e0d\u80fd\u4fdd\u8bc1\u6570\u636e\u7684\u5173\u8054\u6027\u3002\u8fd9\u4e2a\u65f6\u5019\u6211\u4eec\u5c31\u53ef\u4ee5\u4f7f\u7528\u5916\u952e\u3002\u4f8b\u5982\uff0c\u5916\u952e\u53ef\u4ee5\u4fdd\u8bc1\u6bcf\u4e00\u6761\u9500\u552e\u8bb0\u5f55\u90fd\u6307\u5411\u67d0\u4e00\u4e2a\u5b58\u5728\u7684\u5ba2\u6237\u3002\u5728\u8fd9\u91cc\uff0c\u5916\u952e\u53ef\u4ee5 customerinfo \u8868\u4e2d\u7684 CustomerID \u6620\u5c04\u5230 salesinfo \u8868\u4e2d CustomerID\uff0c\u4efb\u4f55\u4e00\u6761\u6ca1\u6709\u5408 CustomerID \u7684\u8bb0\u5f55\u90fd\u4e0d\u4f1a\u88ab\u66f4\u65b0\u6216\u63d2\u5165\u5230 salesinfo \u4e2d\u3002

Create TABLE customerinfo
(
CustomerID INT NOT NULL ,
PRIMARY KEY ( CustomerID )
) TYPE = INNODB;<\/p>\n

Create TABLE salesinfo
(
SalesID INT NOT NULL,
CustomerID INT NOT NULL,
PRIMARY KEY(CustomerID, SalesID),
FOREIGN KEY (CustomerID) REFERENCES customerinfo
(CustomerID) ON DeleteCASCADE
) TYPE = INNODB;
<\/code><\/p>\n

      \u6ce8\u610f\u4f8b\u5b50\u4e2d\u7684\u53c2\u6570 ON Delete CASCADE \u3002\u8be5\u53c2\u6570\u4fdd\u8bc1\u5f53 customerinfo \u8868\u4e2d\u7684\u4e00\u6761\u5ba2\u6237\u8bb0\u5f55\u88ab\u5220\u9664\u7684\u65f6\u5019\uff0csalesinfo \u8868\u4e2d\u6240\u6709\u4e0e\u8be5\u5ba2\u6237\u76f8\u5173\u7684\u8bb0\u5f55\u4e5f\u4f1a\u88ab\u81ea\u52a8\u5220\u9664\u3002\u5982\u679c\u8981\u5728 MySQL \u4e2d\u4f7f\u7528\u5916\u952e\uff0c\u4e00\u5b9a\u8981\u8bb0\u4f4f\u5728\u521b\u5efa\u8868\u7684\u65f6\u5019\u5c06\u8868\u7684\u7c7b\u578b\u5b9a\u4e49\u4e3a\u4e8b\u52a1\u5b89\u5168\u8868 InnoDB \u7c7b\u578b\u3002\u8be5\u7c7b\u578b\u4e0d\u662f MySQL \u8868\u7684\u9ed8\u8ba4\u7c7b\u578b\u3002\u5b9a\u4e49\u7684\u65b9\u6cd5\u662f\u5728 Create TABLE \u8bed\u53e5\u4e2d\u52a0\u4e0a TYPE=INNODB\u3002\u5982\u4f8b\u4e2d\u6240\u793a\u3002
7\uff0c\u4f7f\u7528\u7d22\u5f15
\u7d22\u5f15\u662f\u63d0\u9ad8\u6570\u636e\u5e93\u6027\u80fd\u7684\u5e38\u7528\u65b9\u6cd5\uff0c\u5b83\u53ef\u4ee5\u4ee4\u6570\u636e\u5e93\u670d\u52a1\u5668\u4ee5\u6bd4\u6ca1\u6709\u7d22\u5f15\u5feb\u5f97\u591a\u7684\u901f\u5ea6\u68c0\u7d22\u7279\u5b9a\u7684\u884c\uff0c\u5c24\u5176\u662f\u5728\u67e5\u8be2\u8bed\u53e5\u5f53\u4e2d\u5305\u542b\u6709 MAX(), MIN() \u548c orDERBY \u8fd9\u4e9b\u547d\u4ee4\u7684\u65f6\u5019\uff0c\u6027\u80fd\u63d0\u9ad8\u66f4\u4e3a\u660e\u663e\u3002\u90a3\u8be5\u5bf9\u54ea\u4e9b\u5b57\u6bb5\u5efa\u7acb\u7d22\u5f15\u5462\uff1f\u4e00\u822c\u8bf4\u6765\uff0c\u7d22\u5f15\u5e94\u5efa\u7acb\u5728\u90a3\u4e9b\u5c06\u7528\u4e8e JOIN, Where \u5224\u65ad\u548c orDER BY \u6392\u5e8f\u7684\u5b57\u6bb5\u4e0a\u3002\u5c3d\u91cf\u4e0d\u8981\u5bf9\u6570\u636e\u5e93\u4e2d\u67d0\u4e2a\u542b\u6709\u5927\u91cf\u91cd\u590d\u7684\u503c\u7684\u5b57\u6bb5\u5efa\u7acb\u7d22\u5f15\u3002\u5bf9\u4e8e\u4e00\u4e2a ENUM \u7c7b\u578b\u7684\u5b57\u6bb5\u6765\u8bf4\uff0c\u51fa\u73b0\u5927\u91cf\u91cd\u590d\u503c\u662f\u5f88\u6709\u53ef\u80fd\u7684\u60c5\u51b5\uff0c\u4f8b\u5982 customerinfo \u4e2d\u7684\u201cprovince\u201d.. \u5b57\u6bb5\uff0c\u5728\u8fd9\u6837\u7684\u5b57\u6bb5\u4e0a\u5efa\u7acb\u7d22\u5f15\u5c06\u4e0d\u4f1a\u6709\u4ec0\u4e48\u5e2e\u52a9\uff1b\u76f8\u53cd\uff0c\u8fd8\u6709\u53ef\u80fd\u964d\u4f4e\u6570\u636e\u5e93\u7684\u6027\u80fd\u3002\u6211\u4eec\u5728\u521b\u5efa\u8868\u7684\u65f6\u5019\u53ef\u4ee5\u540c\u65f6\u521b\u5efa\u5408\u9002\u7684\u7d22\u5f15\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528 Alter TABLE \u6216 Create INDEX \u5728\u4ee5\u540e\u521b\u5efa\u7d22\u5f15\u3002\u6b64\u5916\uff0cMySQL \u4ece\u7248\u672c 3.23.23 \u5f00\u59cb\u652f\u6301\u5168\u6587\u7d22\u5f15\u548c\u641c\u7d22\u3002\u5168\u6587\u7d22\u5f15\u5728 MySQL \u4e2d\u662f\u4e00\u4e2a FULLTEXT \u7c7b\u578b\u7d22\u5f15\uff0c\u4f46\u4ec5\u80fd\u7528\u4e8e MyISAM \u7c7b\u578b\u7684\u8868\u3002\u5bf9\u4e8e\u4e00\u4e2a\u5927\u7684\u6570\u636e\u5e93\uff0c\u5c06\u6570\u636e\u88c5\u8f7d\u5230\u4e00\u4e2a\u6ca1\u6709 FULLTEXT \u7d22\u5f15\u7684\u8868\u4e2d\uff0c\u7136\u540e\u518d\u4f7f\u7528 Alter TABLE \u6216 Create INDEX \u521b\u5efa\u7d22\u5f15\uff0c\u5c06\u662f\u975e\u5e38\u5feb\u7684\u3002\u4f46\u5982\u679c\u5c06\u6570\u636e\u88c5\u8f7d\u5230\u4e00\u4e2a\u5df2\u7ecf\u6709 FULLTEXT \u7d22\u5f15\u7684\u8868\u4e2d\uff0c\u6267\u884c\u8fc7\u7a0b\u5c06\u4f1a\u975e\u5e38\u6162\u3002
8\uff0c\u4f18\u5316\u67e5\u8be2\u8bed\u53e5
      \u7edd\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528\u7d22\u5f15\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8be2\u7684\u901f\u5ea6\uff0c\u4f46\u5982\u679c SQL \u8bed\u53e5\u4f7f\u7528\u4e0d\u6070\u5f53\u7684\u8bdd\uff0c\u7d22\u5f15\u5c06\u65e0\u6cd5\u53d1\u6325\u5b83\u5e94\u6709\u7684\u4f5c\u7528\u3002\u4e0b\u9762\u662f\u5e94\u8be5\u6ce8\u610f\u7684\u51e0\u4e2a\u65b9\u9762\u3002\u9996\u5148\uff0c\u6700\u597d\u662f\u5728\u76f8\u540c\u7c7b\u578b\u7684\u5b57\u6bb5\u95f4\u8fdb\u884c\u6bd4\u8f83\u7684\u64cd\u4f5c\u3002\u5728MySQL 3.23\u7248\u4e4b\u524d\uff0c\u8fd9\u751a\u81f3\u662f\u4e00\u4e2a\u5fc5\u987b\u7684\u6761\u4ef6\u3002\u4f8b\u5982\u4e0d\u80fd\u5c06\u4e00\u4e2a\u5efa\u6709\u7d22\u5f15\u7684 INT \u5b57\u6bb5\u548c BIGINT \u5b57\u6bb5\u8fdb\u884c\u6bd4\u8f83\uff1b\u4f46\u662f\u4f5c\u4e3a\u7279\u6b8a\u7684\u60c5\u51b5\uff0c\u5728 CHAR \u7c7b\u578b\u7684\u5b57\u6bb5\u548c VARCHAR \u7c7b\u578b\u5b57\u6bb5\u7684\u5b57\u6bb5\u5927\u5c0f\u76f8\u540c\u7684\u65f6\u5019\uff0c\u53ef\u4ee5\u5c06\u5b83\u4eec\u8fdb\u884c\u6bd4\u8f83\u3002\u5176\u6b21\uff0c\u5728\u5efa\u6709\u7d22\u5f15\u7684\u5b57\u6bb5\u4e0a\u5c3d\u91cf\u4e0d\u8981\u4f7f\u7528\u51fd\u6570\u8fdb\u884c\u64cd\u4f5c\u3002
\u4f8b\u5982\uff0c\u5728\u4e00\u4e2a DATE \u7c7b\u578b\u7684\u5b57\u6bb5\u4e0a\u4f7f\u7528 YEAE() \u51fd\u6570\u65f6\uff0c\u5c06\u4f1a\u4f7f\u7d22\u5f15\u4e0d\u80fd\u53d1\u6325\u5e94\u6709\u7684\u4f5c\u7528\u3002\u6240\u4ee5\uff0c\u4e0b\u9762\u7684\u4e24\u4e2a\u67e5\u8be2\u867d\u7136\u8fd4\u56de\u7684\u7ed3\u679c\u4e00\u6837\uff0c\u4f46\u540e\u8005\u8981\u6bd4\u524d\u8005\u5feb\u5f97\u591a\uff1a

Select * FROM order Where YEAR(OrderDate)\uff1c2001;
Select * FROM order Where orderDate\uff1c\"2001-01-01\";
<\/code><\/p>\n

   \u540c\u6837\u7684\u60c5\u5f62\u4e5f\u4f1a\u53d1\u751f\u5728\u5bf9\u6570\u503c\u578b\u5b57\u6bb5\u8fdb\u884c\u8ba1\u7b97\u7684\u65f6\u5019\uff1a

Select * FROM inventory Where Amount\/7\uff1c24;
Select * FROM inventory Where Amount\uff1c24*7;
<\/code><\/p>\n

\u4e0a\u9762\u7684\u4e24\u4e2a\u67e5\u8be2\u4e5f\u662f\u8fd4\u56de\u76f8\u540c\u7684\u7ed3\u679c\uff0c\u4f46\u540e\u9762\u7684\u67e5\u8be2\u5c06\u6bd4\u524d\u9762\u7684\u4e00\u4e2a\u5feb\u5f88\u591a\u3002
      \u7b2c\u4e09\uff0c\u5728\u641c\u7d22\u5b57\u7b26\u578b\u5b57\u6bb5\u65f6\uff0c\u6211\u4eec\u6709\u65f6\u4f1a\u4f7f\u7528 LIKE \u5173\u952e\u5b57\u548c\u901a\u914d\u7b26\uff0c\u8fd9\u79cd\u505a\u6cd5\u867d\u7136\u7b80\u5355\uff0c\u4f46\u5374\u4e5f\u662f\u4ee5\u727a\u7272\u7cfb\u7edf\u6027\u80fd\u4e3a\u4ee3\u4ef7\u7684\u3002\u4f8b\u5982\u4e0b\u9762\u7684\u67e5\u8be2\u5c06\u4f1a\u6bd4\u8f83\u8868\u4e2d\u7684\u6bcf\u4e00\u6761\u8bb0\u5f55\uff1a

Select * FROM books
Where name LIKE \"MySQL%\"
<\/code><\/p>\n

      \u4e0a\u9762\u8fd9\u6761\u8bed\u53e5\u641c\u7d22\u51fa\u6240\u6709\u4ee5\u201cMySQL\u201d\u5f00\u5934\u7684\u540d\u5b57\u6765\uff0c\u4f46\u662f\u5982\u679c\u6362\u7528\u4e0b\u9762\u7684\u67e5\u8be2\uff0c\u8fd4\u56de\u7684\u7ed3\u679c\u4e00\u6837\uff0c\u4f46\u901f\u5ea6\u5c31\u8981\u5feb\u4e0a\u5f88\u591a\uff1a\uff08\u8fd9\u91cc\u6d89\u53ca\u5230\u4e86\u5b57\u7b26\u4e32\u7684\u6bd4\u8f83\u95ee\u9898\uff09

Select * FROM books
Where name\uff1e=\"MySQL\" AND name\uff1c\"MySQM\"
<\/code><\/p>\n

       \u6ce8\u610f\u540e\u9762\u7684\u201cMySQM\u201d\uff0c\u7b2c\u4e00\u773c\u770b\u7684\u633a\u201c\u795e\u5947\u201d\u7684\uff0c\u4e0d\u8fc7\u5b83\u5176\u5b9e\u4e5f\u5339\u914d\u51fa\u4e86\u6240\u6709\u4ee5\u201cMySQL\u201d\u5f00\u59cb\u7684\u540d\u5b57\uff0c\u4e3a\u4ec0\u4e48\u5462\uff1f\u56e0\u4e3a \u8981\u77e5\u9053 \u5b57\u7b26\u7684\u5927\u5c0f\u662f A<B<C…<Z\u3002\u5b57\u7b26\u4e32\u6bd4\u8f83\uff0c\u5148\u6bd4\u8f83\u7b2c\u4e00\u4e2a\u5b57\u7b26\uff0c\u5927\u7684\u5927\uff1b\u82e5\u76f8\u540c\u5219\u7ee7\u7eed\u6bd4\u8f83\u7b2c\u4e8c\u4e2a\uff0c\u4e00\u76f4\u5230\u5b57\u7b26\u4e32\u7ed3\u675f\u3002\u6240\u4ee5\u2026
      \u8fd8\u9700\u8981\u6ce8\u610f\u7684\u662f\uff1a\u5e94\u8be5\u6ce8\u610f\u907f\u514d\u5728\u67e5\u8be2\u4e2d\u8ba9 MySQL \u8fdb\u884c\u81ea\u52a8\u7c7b\u578b\u8f6c\u6362\uff0c\u56e0\u4e3a\u8f6c\u6362\u8fc7\u7a0b\u4e5f\u4f1a\u4f7f\u7d22\u5f15\u53d8\u5f97\u4e0d\u8d77\u4f5c\u7528\u3002
9*\uff0c\u5173\u4e8e\u901a\u8fc7\u67e5\u8be2\u7f13\u51b2\u63d0\u9ad8\u67e5\u8be2\u901f\u5ea6
      \u4e00\u822c\u6211\u4eec\u4f7f\u7528 SQL \u8bed\u53e5\u8fdb\u884c\u67e5\u8be2\u65f6\uff0c\u6570\u636e\u5e93\u670d\u52a1\u5668\u6bcf\u6b21\u5728\u6536\u5230\u5ba2\u6237\u7aef\u53d1\u6765 SQL \u540e\uff0c\u90fd\u4f1a\u6267\u884c\u8fd9\u6761 SQL \u8bed\u53e5\u3002\u4f46\u5f53\u5728\u4e00\u5b9a\u95f4\u9694\u5185(\u59821\u5206\u949f\u5185)\uff0c\u63a5\u5230\u5b8c\u5168\u4e00\u6837\u7684 SQL \u8bed\u53e5\uff0c\u4e5f\u540c\u6837\u6267\u884c\u5b83\u3002\u867d\u7136\u8fd9\u6837\u53ef\u4ee5\u4fdd\u8bc1\u6570\u636e\u7684\u5b9e\u65f6\u6027\uff0c\u4f46\u5728\u5927\u591a\u6570\u65f6\u5019\uff0c\u6570\u636e\u5e76\u4e0d\u8981\u6c42\u5b8c\u5168\u7684\u5b9e\u65f6\uff0c\u4e5f\u5c31\u662f\u8bf4\u53ef\u4ee5\u6709\u4e00\u5b9a\u7684\u5ef6\u65f6\u3002\u5982\u679c\u662f\u8fd9\u6837\u7684\u8bdd\uff0c\u5728\u77ed\u65f6\u95f4\u5185\u6267\u884c\u5b8c\u5168\u4e00\u6837\u7684 SQL \u5c31\u6709\u4e9b\u5f97\u4e0d\u507f\u5931\u3002
      \u5e78\u597d MySQL \u4e3a\u6211\u4eec\u63d0\u4f9b\u4e86\u67e5\u8be2\u7f13\u51b2\u7684\u529f\u80fd(\u53ea\u80fd\u5728 MySQL 4.0.1 \u53ca\u4ee5\u4e0a\u7248\u672c\u4f7f\u7528\u67e5\u8be2\u7f13\u51b2)\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u67e5\u8be2\u7f13\u51b2\u5728\u4e00\u5b9a\u7a0b\u5ea6\u4e0a\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u3002
      \u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5728 MySQL \u5b89\u88c5\u76ee\u5f55\u4e2d\u7684 my.ini \u6587\u4ef6\u8bbe\u7f6e\u67e5\u8be2\u7f13\u51b2\u3002\u8bbe\u7f6e\u4e5f\u975e\u5e38\u7b80\u5355\uff0c\u53ea\u9700\u8981\u5c06query_cache_type \u8bbe\u4e3a 1 \u5373\u53ef\u3002\u5728\u8bbe\u7f6e\u4e86\u8fd9\u4e2a\u5c5e\u6027\u540e\uff0cMySQL \u5728\u6267\u884c\u4efb\u4f55 Select \u8bed\u53e5\u4e4b\u524d\uff0c\u90fd\u4f1a\u5728\u5b83\u7684\u7f13\u51b2\u533a\u4e2d\u67e5\u8be2\u662f\u5426\u5728\u76f8\u540c\u7684 Select \u8bed\u53e5\u88ab\u6267\u884c\u8fc7\uff0c\u5982\u679c\u6709\uff0c\u5e76\u4e14\u6267\u884c\u7ed3\u679c\u6ca1\u6709\u8fc7\u671f\uff0c\u90a3\u4e48\u5c31\u76f4\u63a5\u53d6\u67e5\u8be2\u7ed3\u679c\u8fd4\u56de\u7ed9\u5ba2\u6237\u7aef\u3002\u4f46\u5728\u5199 SQL \u8bed\u53e5\u65f6\u6ce8\u610f\uff0cMySQL \u7684\u67e5\u8be2\u7f13\u51b2\u662f\u533a\u5206\u5927\u5c0f\u5199\u7684\u3002\u5982\u4e0b\u5217\u7684\u4e24\u6761 Select \u8bed\u53e5:

Select * from TABLE1<\/p>\n

Select * FROM TABLE1
<\/code><\/p>\n

      \u4e0a\u9762\u7684\u4e24\u6761 SQL \u8bed\u53e5\u5bf9\u4e8e\u67e5\u8be2\u7f13\u51b2\u662f\u5b8c\u5168\u4e0d\u540c\u7684 Select\u3002\u800c\u4e14\u67e5\u8be2\u7f13\u51b2\u5e76\u4e0d\u81ea\u52a8\u5904\u7406\u7a7a\u683c\uff0c\u56e0\u6b64\uff0c\u5728\u5199 SQL \u8bed\u53e5\u65f6\uff0c\u5e94\u5c3d\u91cf\u51cf\u5c11\u7a7a\u683c\u7684\u4f7f\u7528\uff0c\u5c24\u5176\u662f\u5728 SQL \u9996\u548c\u5c3e\u7684\u7a7a\u683c(\u56e0\u4e3a\uff0c\u67e5\u8be2\u7f13\u51b2\u5e76\u4e0d\u81ea\u52a8\u622a\u53d6\u9996\u5c3e\u7a7a\u683c)\u3002
      \u867d\u7136\u4e0d\u8bbe\u7f6e\u67e5\u8be2\u7f13\u51b2\uff0c\u6709\u65f6\u53ef\u80fd\u5e26\u6765\u6027\u80fd\u4e0a\u7684\u635f\u5931\uff0c\u4f46\u6709\u4e00\u4e9b SQL \u8bed\u53e5\u9700\u8981\u5b9e\u65f6\u5730\u67e5\u8be2\u6570\u636e\uff0c\u6216\u8005\u5e76\u4e0d\u7ecf\u5e38\u4f7f\u7528(\u53ef\u80fd\u4e00\u5929\u5c31\u6267\u884c\u4e00\u4e24\u6b21)\u3002\u8fd9\u6837\u5c31\u9700\u8981\u628a\u7f13\u51b2\u5173\u4e86\u3002\u5f53\u7136\uff0c\u8fd9\u53ef\u4ee5\u901a\u8fc7\u8bbe\u7f6equery_cache_type \u7684\u503c\u6765\u5173\u95ed\u67e5\u8be2\u7f13\u51b2\uff0c\u4f46\u8fd9\u5c31\u5c06\u67e5\u8be2\u7f13\u51b2\u6c38\u4e45\u5730\u5173\u95ed\u4e86\u3002\u5728 MySQL 5.0 \u4e2d\u63d0\u4f9b\u4e86\u4e00\u79cd\u53ef\u4ee5\u4e34\u65f6\u5173\u95ed\u67e5\u8be2\u7f13\u51b2\u7684\u65b9\u6cd5:

Select SQL_NO_CACHE field1, field2 FROM TABLE1
<\/code><\/p>\n

      \u4ee5\u4e0a\u7684 SQL \u8bed\u53e5\u7531\u4e8e\u4f7f\u7528\u4e86 SQL_NO_CACHE\uff0c\u56e0\u6b64\uff0c\u4e0d\u7ba1\u8fd9\u6761 SQL \u8bed\u53e5\u662f\u5426\u88ab\u6267\u884c\u8fc7\uff0c\u670d\u52a1\u5668\u90fd\u4e0d\u4f1a\u5728\u7f13\u51b2\u533a\u4e2d\u67e5\u627e\uff0c\u6bcf\u6b21\u90fd\u4f1a\u6267\u884c\u5b83\u3002
      \u6211\u4eec\u8fd8\u53ef\u4ee5\u5c06 my.ini \u4e2d\u7684 query_cache_type \u8bbe\u6210 2\uff0c\u8fd9\u6837\u53ea\u6709\u5728\u4f7f\u7528\u4e86SQL_CACHE \u540e\uff0c\u624d\u4f7f\u7528\u67e5\u8be2\u7f13\u51b2\uff1a

Select SQL_CALHE * FROM TABLE1
<\/code><\/p>\n","protected":false},"excerpt":{"rendered":"

\u6765\u770b\u770b\u4e00\u4e9b\u5e38\u7528\u7684 MySQL \u6570\u636e\u5e93\u4f18\u5316\u65b9\u6cd5\uff1a1\uff0c\u9009\u53d6\u6700\u9002\u7528\u7684\u5b57\u6bb5\u5c5e...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-526","post","type-post","status-publish","format-standard","hentry","category-DB"],"_links":{"self":[{"href":"https:\/\/www.poloo.org\/index.php?rest_route=\/wp\/v2\/posts\/526","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.poloo.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.poloo.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.poloo.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.poloo.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=526"}],"version-history":[{"count":0,"href":"https:\/\/www.poloo.org\/index.php?rest_route=\/wp\/v2\/posts\/526\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.poloo.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=526"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.poloo.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=526"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.poloo.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=526"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}