\u63d0\u9ad8MySQL\u6570\u636e\u5e93\u6027\u80fd\u4e4b\u9501\u5b9a\u8868 <\/p>\n
\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\u54cdMySQL\u6570\u636e\u5e93\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<\/p>\n
\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\u3002<\/p>\n
\u63d0\u9ad8MySQL\u6570\u636e\u5e93\u6027\u80fd\u4e4b\u4f7f\u7528\u5916\u952e <\/p>\n \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\u628acustomerinfo \u8868\u4e2d\u7684CustomerID\u6620\u5c04\u5230salesinfo\u8868\u4e2dCustomerID\uff0c\u4efb\u4f55\u4e00\u6761\u6ca1\u6709\u5408\u6cd5CustomerID\u7684\u8bb0\u5f55\u90fd\u4e0d\u4f1a\u88ab\u66f4\u65b0\u6216\u63d2\u5165\u5230salesinfo\u4e2d\u3002<\/p>\n Create TABLE salesinfo ( \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<\/p>\n \u63d0\u9ad8MySQL\u6570\u636e\u5e93\u6027\u80fd\u4e4b\u4f7f\u7528\u7d22\u5f15 <\/p>\n \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\u6709MAX(), MIN()\u548cORDERBY\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\u4e8eJOIN, Where\u5224\u65ad\u548cORDER BY\u6392\u5e8f\u7684\u5b57\u6bb5\u4e0a\u3002<\/p>\n \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\u4e2aENUM\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\u5982customerinfo\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\u7528Alter TABLE\u6216Create INDEX\u5728\u4ee5\u540e\u521b\u5efa\u7d22\u5f15\u3002\u6b64\u5916\uff0cMySQL \u63d0\u9ad8MySQL\u6570\u636e\u5e93\u6027\u80fd\u4e4b\u4f18\u5316\u7684\u67e5\u8be2\u8bed\u53e5 <\/p>\n \u7edd\u5927\u591a\u6570\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528\u7d22\u5f15\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8be2\u7684\u901f\u5ea6\uff0c\u4f46\u5982\u679cSQL\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<\/p>\n \u4f8b\u5982\u4e0d\u80fd\u5c06\u4e00\u4e2a\u5efa\u6709\u7d22\u5f15\u7684INT\u5b57\u6bb5\u548cBIGINT\u5b57\u6bb5\u8fdb\u884c\u6bd4\u8f83\uff1b\u4f46\u662f\u4f5c\u4e3a\u7279\u6b8a\u7684\u60c5\u51b5\uff0c\u5728CHAR\u7c7b\u578b\u7684\u5b57\u6bb5\u548cVARCHAR\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<\/p>\n \u4f8b\u5982\uff0c\u5728\u4e00\u4e2aDATE\u7c7b\u578b\u7684\u5b57\u6bb5\u4e0a\u4f7f\u7528YEAE()\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\u3002<\/p>\n \u63d0\u9ad8MySQL\u6570\u636e\u5e93\u6027\u80fd\u4e4b\u9501\u5b9a\u8868 \u5c3d\u7ba1\u4e8b\u52a1\u662f\u7ef4\u62a4\u6570\u636e\u5e93\u5b8c\u6574\u6027\u7684\u4e00\u4e2a\u975e...<\/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-450","post","type-post","status-publish","format-standard","hentry","category-DB"],"_links":{"self":[{"href":"https:\/\/www.poloo.org\/index.php?rest_route=\/wp\/v2\/posts\/450","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=450"}],"version-history":[{"count":0,"href":"https:\/\/www.poloo.org\/index.php?rest_route=\/wp\/v2\/posts\/450\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.poloo.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=450"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.poloo.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=450"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.poloo.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=450"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
LOCK TABLE inventory WRITE
Select Quantity FROM inventory
WhereItem='book';
...
Update inventory SET Quantity=11
WhereItem='book';
UNLOCK TABLES
<\/code>
\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<\/p>\n
Create TABLE customerinfo (
CustomerID INT NOT NULL ,
PRIMARY KEY ( CustomerID )
) TYPE = INNODB; <\/p>\n
SalesID INT NOT NULL,
CustomerID INT NOT NULL,
PRIMARY KEY(CustomerID, SalesID),
FOREIGN KEY (CustomerID) REFERENCES customerinfo
(CustomerID) ON DeleteCASCADE
) TYPE = INNODB;
<\/code>
\u6ce8\u610f\u4f8b\u5b50\u4e2d\u7684\u53c2\u6570\u201cON Delete CASCADE\u201d\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<\/p>\n
\u4ece\u7248\u672c3.23.23\u5f00\u59cb\u652f\u6301\u5168\u6587\u7d22\u5f15\u548c\u641c\u7d22\u3002\u5168\u6587\u7d22\u5f15\u5728MySQL \u4e2d\u662f\u4e00\u4e2aFULLTEXT\u7c7b\u578b\u7d22\u5f15\uff0c\u4f46\u4ec5\u80fd\u7528\u4e8eMyISAM \u7c7b\u578b\u7684\u8868\u3002\u5bf9\u4e8e\u4e00\u4e2a\u5927\u7684\u6570\u636e\u5e93\uff0c\u5c06\u6570\u636e\u88c5\u8f7d\u5230\u4e00\u4e2a\u6ca1\u6709FULLTEXT\u7d22\u5f15\u7684\u8868\u4e2d\uff0c\u7136\u540e\u518d\u4f7f\u7528Alter TABLE\u6216Create 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\u6709FULLTEXT\u7d22\u5f15\u7684\u8868\u4e2d\uff0c\u6267\u884c\u8fc7\u7a0b\u5c06\u4f1a\u975e\u5e38\u6162\u3002<\/p>\n
Select * FROM order Where YEAR(OrderDate)<2001;
Select * FROM order Where orderDate<\"2001-01-01\";
<\/code>
\u540c\u6837\u7684\u60c5\u5f62\u4e5f\u4f1a\u53d1\u751f\u5728\u5bf9\u6570\u503c\u578b\u5b57\u6bb5\u8fdb\u884c\u8ba1\u7b97\u7684\u65f6\u5019\uff1a<\/p>\n
Select * FROM inventory Where Amount\/7<24;
Select * FROM inventory Where Amount<24*7;
<\/code>
\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\u3002<\/p>\n
Select * FROM books
Where name like \"MySQL%\"
<\/code>
\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<\/p>\n
Select * FROM books
Where name>=\"MySQL\"and name<\"MySQM\"
<\/code>
\u6700\u540e\uff0c\u5e94\u8be5\u6ce8\u610f\u907f\u514d\u5728\u67e5\u8be2\u4e2d\u8ba9MySQL\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<\/p>\n","protected":false},"excerpt":{"rendered":"