{"id":115107,"date":"2026-10-11T07:40:57","date_gmt":"2026-10-10T23:40:57","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/115107.html"},"modified":"2026-10-11T07:40:57","modified_gmt":"2026-10-10T23:40:57","slug":"mysql%e7%b4%a2%e5%bc%95%e5%a4%b1%e6%95%88%e7%9a%84%e5%9c%ba%e6%99%af%e6%80%bb%e7%bb%93","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/115107.html","title":{"rendered":"MySQL\u7d22\u5f15\u5931\u6548\u7684\u573a\u666f\u603b\u7ed3"},"content":{"rendered":"

\u4e0a\u4e00\u7bc7\u8bb2\u6267\u884c\u5668\u7684\u65f6\u5019\u8bf4\u8fc7，\u6709\u6ca1\u6709\u7d22\u5f15，\u51b3\u5b9a\u4e86\u6267\u884c\u5668\u662f"\u4e00\u884c\u884c\u53d6\u56de\u6765\u81ea\u5df1\u5224\u65ad"\u8fd8\u662f"\u8ba9\u5f15\u64ce\u76f4\u63a5\u5b9a\u4f4d\u5230\u76ee\u6807\u884c"\u3002\u7d22\u5f15\u80fd\u8d77\u4f5c\u7528\u7684\u524d\u63d0\u53ea\u6709\u4e00\u6761：\u6761\u4ef6\u80fd\u62ff\u6765\u5b9a\u4f4d\u3002<\/p>\n

InnoDB \u7684\u7d22\u5f15\u662f\u4e00\u68f5\u6309\u5217\u503c\u6392\u597d\u5e8f\u7684 B+ \u6811，\u9760\u7684\u5c31\u662f\u8fd9\u4e2a\u987a\u5e8f\u53bb\u7f29\u5c0f\u67e5\u627e\u8303\u56f4\u3002\u53ea\u8981\u5199\u6cd5\u7834\u574f\u4e86\u8fd9\u4e2a\u987a\u5e8f，\u6216\u8005\u8ba9\u67d0\u4e00\u5217\u7684\u503c\u6ca1\u6cd5\u6309\u539f\u6837\u6bd4\u8f83，\u7d22\u5f15\u5c31\u5b9a\u4f4d\u4e0d\u4e86，\u53ea\u80fd\u9000\u56de\u5168\u8868\u626b\u63cf\u3002\u53e6\u5916\u8fd8\u6709\u4e00\u7c7b\u60c5\u51b5\u662f\u6761\u4ef6\u672c\u8eab\u6ca1\u95ee\u9898，\u4f46\u4f18\u5316\u5668\u7b97\u4e0b\u6765\u89c9\u5f97\u5168\u8868\u626b\u66f4\u4fbf\u5b9c，\u4e3b\u52a8\u4e0d\u7528\u7d22\u5f15\u3002\u8fd9\u7bc7\u6211\u4eec\u628a\u8fd9\u4e24\u7c7b\u90fd\u6574\u7406\u4e00\u904d\u3002<\/p>\n

\n

\u7d22\u5f15\u5217\u88ab\u52a0\u5de5\u4e86<\/h2>\n

\u7528\u51fd\u6570\u6216\u8fd0\u7b97\u5305\u4f4f\u7d22\u5f15\u5217<\/h3>\n

— \u5931\u6548：\u6761\u4ef6\u5217\u88ab date() \u5305\u4f4f<\/span>
\nselect<\/span> *<\/span> from<\/span> t where<\/span> date<\/span>(<\/span>created_at)<\/span> =<\/span> '2024-01-01'<\/span>;<\/span><\/p>\n

— \u5931\u6548：\u6761\u4ef6\u5217\u505a\u4e86\u8fd0\u7b97<\/span>
\nselect<\/span> *<\/span> from<\/span> t where<\/span> id +<\/span> 1<\/span> =<\/span> 10<\/span>;<\/span><\/p>\n

\u7d22\u5f15\u6811\u91cc\u5b58\u7684\u662f created_at \u7684\u539f\u59cb\u503c，\u672c\u6765\u53ef\u4ee5\u6309\u539f\u503c\u76f4\u63a5\u5b9a\u4f4d\u3002\u5957\u4e0a date() \u4e4b\u540e，\u5f97\u628a\u6bcf\u4e00\u884c\u7684\u503c\u90fd\u7b97\u4e00\u904d\u624d\u77e5\u9053\u548c '2024-01-01' \u7b49\u4e0d\u7b49，\u6811\u4e0a\u7684\u987a\u5e8f\u5b8c\u5168\u7528\u4e0d\u4e0a\u3002<\/p>\n

\u6539\u5199\u65b9\u5411\u662f\u628a\u8fd0\u7b97\u632a\u5230\u7b49\u53f7\u53f3\u8fb9，\u8ba9\u6761\u4ef6\u5217\u4fdd\u6301"\u5e72\u51c0"：<\/p>\n

select<\/span> *<\/span> from<\/span> t where<\/span> created_at >=<\/span> '2024-01-01'<\/span> and<\/span> created_at <<\/span> '2024-01-02'<\/span>;<\/span>
\nselect<\/span> *<\/span> from<\/span> t where<\/span> id =<\/span> 9<\/span>;<\/span><\/p>\n

\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362<\/h3>\n

— phone \u662f varchar \u7c7b\u578b<\/span>
\nselect<\/span> *<\/span> from<\/span> t where<\/span> phone =<\/span> 13800000000<\/span>;<\/span> — \u5931\u6548<\/span><\/p>\n

MySQL \u5728\u6bd4\u8f83\u5b57\u7b26\u4e32\u548c\u6570\u5b57\u65f6，\u4f1a\u628a\u5b57\u7b26\u4e32\u8f6c\u6210\u6570\u5b57\u3002\u8fd9\u91cc phone \u662f varchar，\u5c31\u53d8\u6210\u4e86 CAST(phone AS DOUBLE) = 13800000000，\u7b49\u4e8e\u7ed9\u5217\u5957\u4e86\u4e00\u4e2a\u51fd\u6570，\u548c\u4e0a\u9762\u4e00\u79cd\u60c5\u51b5\u672c\u8d28\u76f8\u540c\u3002<\/p>\n

\u53cd\u8fc7\u6765\u7684\u65b9\u5411\u4e0d\u5f71\u54cd：<\/p>\n

— id \u662f int \u7c7b\u578b<\/span>
\nselect<\/span> *<\/span> from<\/span> t where<\/span> id =<\/span> '10'<\/span>;<\/span> — \u4ecd\u8d70\u7d22\u5f15<\/span><\/p>\n

\u56e0\u4e3a\u5b57\u7b26\u4e32 '10' \u88ab\u8f6c\u6210\u6570\u5b57 10，\u7b49\u4ef7\u4e8e id = 10，\u5217\u672c\u8eab\u6ca1\u88ab\u78b0\u3002\u6240\u4ee5\u89c4\u5f8b\u662f：\u5b57\u7b26\u4e32\u5217\u4f20\u6570\u5b57\u4f1a\u5931\u6548，\u6570\u5b57\u5217\u4f20\u5b57\u7b26\u4e32\u4e0d\u5f71\u54cd\u3002<\/p>\n

\u8fd9\u4e2a\u5751\u8fd8\u5e38\u51fa\u73b0\u5728 join \u4e0a：\u4e24\u5f20\u8868\u5173\u8054\u7684\u5b57\u6bb5\u4e00\u4e2a\u662f varchar\u3001\u4e00\u4e2a\u662f int，\u5173\u8054\u65f6\u540c\u6837\u4f1a\u89e6\u53d1\u8f6c\u6362，\u7d22\u5f15\u4e5f\u7528\u4e0d\u4e0a\u3002<\/p>\n

\u9700\u8981\u6ce8\u610f\u7684\u662f，\u9690\u5f0f\u8f6c\u6362\u4e0d\u62a5\u9519\u3001\u4e5f\u4e0d\u4f1a\u6709\u8b66\u544a，EXPLAIN \u91cc\u624d\u770b\u5f97\u51fa\u6765\u3002\u53c2\u6570\u7c7b\u578b\u548c\u5217\u7c7b\u578b\u4fdd\u6301\u4e00\u81f4，\u662f\u907f\u514d\u5b83\u7684\u552f\u4e00\u529e\u6cd5\u3002<\/p>\n

\n

\u6761\u4ef6\u7684\u987a\u5e8f\u7528\u4e0d\u4e0a\u7d22\u5f15<\/h2>\n

\u8054\u5408\u7d22\u5f15\u4e0e\u6700\u5de6\u524d\u7f00<\/h3>\n

\u8054\u5408\u7d22\u5f15 (a, b, c) \u7684\u6392\u5e8f\u89c4\u5219\u662f：\u5148\u6309 a \u6392，a \u76f8\u540c\u518d\u6309 b \u6392，b \u76f8\u540c\u518d\u6309 c \u6392\u3002\u6240\u4ee5\u8981\u7528\u4e0a\u5b83，\u6761\u4ef6\u5fc5\u987b\u4ece\u6700\u5de6\u8fb9\u7684\u5217\u5f00\u59cb\u3001\u8fde\u7eed\u5730\u7528：<\/p>\n\n\u6761\u4ef6\u7528\u5230\u7684\u7d22\u5f15\u5217<\/tr>\n\n\n\n\n\n\n\n
where a = 1<\/td>\na<\/td>\n<\/tr>\n
where a = 1 and b = 2<\/td>\na, b<\/td>\n<\/tr>\n
where a = 1 and b = 2 and c = 3<\/td>\na, b, c<\/td>\n<\/tr>\n
where a = 1 and c = 3<\/td>\n\u53ea\u6709 a，c \u7528\u4e0d\u4e0a<\/td>\n<\/tr>\n
where b = 2<\/td>\n\u7528\u4e0d\u4e0a<\/td>\n<\/tr>\n
where c = 3<\/td>\n\u7528\u4e0d\u4e0a<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u539f\u56e0\u8fd8\u662f\u90a3\u4e2a\u987a\u5e8f：\u8df3\u8fc7 a \u5c31\u6ca1\u6cd5\u5b9a\u4f4d，b\u3001c \u5355\u72ec\u7684\u6392\u5e8f\u5728\u6574\u68f5\u6811\u91cc\u662f\u4e71\u7684\u3002<\/p>\n

\u6ce8\u610f\u6761\u4ef6\u7684\u4e66\u5199\u987a\u5e8f\u65e0\u6240\u8c13，\u4f18\u5316\u5668\u4f1a\u81ea\u52a8\u8c03\u6574\u6210\u6700\u5de6\u524d\u7f00\u7684\u987a\u5e8f，where b = 2 and a = 1 \u548c where a = 1 and b = 2 \u6548\u679c\u4e00\u6837\u3002\u5173\u952e\u662f\u7528\u5230\u7684\u662f\u4e0d\u662f\u6700\u5de6\u8fb9\u90a3\u8fde\u7eed\u51e0\u5217\u3002<\/p>\n

\u53e6\u5916，MySQL 8.0 \u5f15\u5165\u4e86 skip scan，\u5728 a \u7684\u53d6\u503c\u79cd\u7c7b\u5f88\u5c11（\u533a\u5206\u5ea6\u6781\u4f4e）\u65f6，\u4f1a\u5c1d\u8bd5\u8df3\u8fc7 a \u76f4\u63a5\u6309 b \u627e\u3002\u8fd9\u662f\u7279\u5b9a\u6761\u4ef6\u4e0b\u7684\u7279\u4f8b，\u4e0d\u80fd\u4f9d\u8d56\u3002<\/p>\n

\u8303\u56f4\u6761\u4ef6\u4e4b\u540e\u7684\u5217<\/h3>\n

— \u7d22\u5f15 (a, b, c)<\/span>
\nselect<\/span> *<\/span> from<\/span> t where<\/span> a =<\/span> 1<\/span> and<\/span> b ><\/span> 2<\/span> and<\/span> c =<\/span> 3<\/span>;<\/span> — c \u7528\u4e0d\u4e0a<\/span><\/p>\n

a \u548c b \u80fd\u7528\u4e0a（b \u662f\u8303\u56f4\u67e5\u8be2），\u4f46 c \u7528\u4e0d\u4e0a\u3002\u56e0\u4e3a b \u4e00\u65e6\u662f\u8303\u56f4，\u5728 b \u547d\u4e2d\u7684\u8fd9\u4e00\u6bb5\u91cc，c \u5df2\u7ecf\u4e0d\u518d\u6709\u5e8f\u4e86，\u6ca1\u6cd5\u518d\u62ff\u5b83\u53bb\u5b9a\u4f4d\u3002<\/p>\n

\u6240\u4ee5\u6211\u4eec\u6392\u8054\u5408\u7d22\u5f15\u7684\u5217\u987a\u5e8f\u65f6，\u7b49\u503c\u67e5\u8be2\u7684\u5217\u653e\u524d\u9762，\u8303\u56f4\u67e5\u8be2\u7684\u5217\u653e\u540e\u9762\u3002<\/p>\n

like \u4ee5 % \u5f00\u5934<\/h3>\n

select<\/span> *<\/span> from<\/span> t where<\/span> name like<\/span> '%abc'<\/span>;<\/span> — \u5931\u6548<\/span>
\nselect<\/span> *<\/span> from<\/span> t where<\/span> name like<\/span> '%abc%'<\/span>;<\/span> — \u5931\u6548<\/span>
\nselect<\/span> *<\/span> from<\/span> t where<\/span> name like<\/span> 'abc%'<\/span>;<\/span> — \u6709\u6548<\/span><\/p>\n

abc% \u662f\u524d\u7f00\u786e\u5b9a，\u80fd\u5728\u6709\u5e8f\u7684\u6811\u91cc\u5b9a\u4f4d\u5230 abc \u5f00\u5934\u7684\u533a\u95f4\u3002\u4e00\u65e6 % \u8dd1\u5230\u524d\u9762，\u524d\u7f00\u5c31\u4e0d\u5b9a\u4e86，\u53ea\u80fd\u6328\u4e2a\u6bd4\u8f83\u3002\u5fc5\u987b\u505a\u4e2d\u95f4\u5339\u914d\u7684\u8bdd，\u5f97\u6362\u6210\u5168\u6587\u7d22\u5f15\u6216\u8005\u4e13\u95e8\u7684\u641c\u7d22\u5f15\u64ce，\u666e\u901a B+ \u6811\u7d22\u5f15\u5e2e\u4e0d\u4e0a\u5fd9\u3002<\/p>\n

\n

\u9009\u62e9\u6027\u5dee，\u4f18\u5316\u5668\u4e3b\u52a8\u653e\u5f03<\/h2>\n

\u524d\u9762\u7684\u60c5\u51b5\u662f"\u6761\u4ef6\u6ca1\u6cd5\u5b9a\u4f4d"，\u8fd9\u4e00\u7c7b\u4e0d\u592a\u4e00\u6837：\u6761\u4ef6\u5199\u6cd5\u662f\u5bf9\u7684，\u7d22\u5f15\u4e5f\u80fd\u7528，\u4f46\u4f18\u5316\u5668\u7b97\u4e86\u4e00\u7b14\u8d26，\u89c9\u5f97\u8d70\u7d22\u5f15\u66f4\u4e8f，\u4e8e\u662f\u4e3b\u52a8\u653e\u5f03\u3002<\/p>\n

or \u4e24\u8fb9\u4e0d\u90fd\u6709\u7d22\u5f15<\/h3>\n

— a \u6709\u7d22\u5f15，b \u6ca1\u6709<\/span>
\nselect<\/span> *<\/span> from<\/span> t where<\/span> a =<\/span> 1<\/span> or<\/span> b =<\/span> 2<\/span>;<\/span><\/p>\n

or \u7684\u542b\u4e49\u662f"\u6ee1\u8db3\u4efb\u610f\u4e00\u4e2a\u5373\u53ef"，\u8981\u62ff\u5230\u5b8c\u6574\u7ed3\u679c，b = 2 \u90a3\u90e8\u5206\u4e5f\u5f97\u67e5\u4e00\u904d\u3002\u65e2\u7136 b \u4e0a\u6ca1\u6709\u7d22\u5f15，\u7d22\u6027\u6574\u6761\u8bed\u53e5\u5168\u8868\u626b\u63cf\u3002<\/p>\n

\u5982\u679c a\u3001b \u4e0a\u90fd\u6709\u7d22\u5f15，MySQL \u53ef\u80fd\u4f1a\u7528 index merge，\u5206\u522b\u8d70\u4e24\u4e2a\u7d22\u5f15\u518d\u5408\u5e76\u7ed3\u679c，EXPLAIN \u91cc type \u4f1a\u663e\u793a index_merge\u3002\u6539\u5199\u65b9\u5f0f\u662f\u628a\u4e24\u4e2a\u6761\u4ef6\u62c6\u5f00\u7528 union，\u6216\u8005\u7ed9\u7f3a\u7d22\u5f15\u7684\u90a3\u5217\u4e5f\u8865\u4e0a\u7d22\u5f15\u3002<\/p>\n

\u5426\u5b9a\u6761\u4ef6<\/h3>\n

select<\/span> *<\/span> from<\/span> t where<\/span> name !=<\/span> 'zs'<\/span>;<\/span>
\nselect<\/span> *<\/span> from<\/span> t where<\/span> id not<\/span> in<\/span> (<\/span>1<\/span>,<\/span> 2<\/span>,<\/span> 3<\/span>)<\/span>;<\/span><\/p>\n

!=\u3001<>\u3001not in\u3001not exists \u8fd9\u4e9b\u662f"\u6392\u9664\u5f0f"\u7684\u6761\u4ef6，\u6ee1\u8db3\u6761\u4ef6\u7684\u884c\u53ef\u80fd\u5360\u5168\u8868\u7684\u4e00\u5927\u534a\u3002\u8d70\u7d22\u5f15\u610f\u5473\u7740\u5148\u626b\u7d22\u5f15\u3001\u518d\u56de\u8868，\u56de\u8868\u7684\u884c\u6570\u4e00\u591a，\u8fd8\u4e0d\u5982\u76f4\u63a5\u987a\u5e8f\u626b\u5168\u8868\u3002\u6240\u4ee5\u4f18\u5316\u5668\u901a\u5e38\u653e\u5f03\u7d22\u5f15\u2014\u2014\u4f46\u6ce8\u610f\u8fd9\u662f"\u901a\u5e38"，\u4e0d\u662f\u7edd\u5bf9，\u9009\u62e9\u6027\u9ad8\u7684\u5426\u5b9a\u6761\u4ef6\u4ecd\u6709\u53ef\u80fd\u8d70\u7d22\u5f15\u3002<\/p>\n

IS NULL \u5230\u5e95\u8d70\u4e0d\u8d70<\/h3>\n

\u8fd9\u91cc\u6211\u4eec\u5355\u72ec\u8bf4\u4e00\u6761，\u56e0\u4e3a\u6d41\u4f20\u7684\u8bf4\u6cd5\u6709\u95ee\u9898："\u7d22\u5f15\u4e0d\u5b58 NULL \u503c，\u6240\u4ee5 IS NULL \u4e0d\u8d70\u7d22\u5f15"\u662f\u9519\u7684\u3002InnoDB \u7684\u4e8c\u7ea7\u7d22\u5f15\u662f\u5b58 NULL \u503c\u7684，MySQL \u5b98\u65b9\u624b\u518c\u91cc\u4e5f\u5199\u660e\u4e86 IS NULL \u53ef\u4ee5\u7528\u7d22\u5f15\u548c\u533a\u95f4\u67e5\u627e\u3002<\/p>\n

select<\/span> *<\/span> from<\/span> t where<\/span> address is<\/span> null<\/span>;<\/span> — \u53ef\u4ee5\u7528\u7d22\u5f15<\/span>
\nselect<\/span> *<\/span> from<\/span> t where<\/span> address is<\/span> not<\/span> null<\/span>;<\/span> — \u4e5f\u53ef\u4ee5\u7528，\u4f46\u770b\u6570\u636e\u5206\u5e03<\/span><\/p>\n

\u5177\u4f53\u8d70\u4e0d\u8d70，\u8fd8\u662f\u56de\u5230\u4f18\u5316\u5668\u90a3\u7b14\u8d26：\u7b26\u5408\u6761\u4ef6\u7684\u884c\u5c11，\u5c31\u7528\u7d22\u5f15；\u5360\u4e86\u5927\u534a\u5f20\u8868，\u5c31\u5168\u8868\u626b\u3002\u7f51\u4e0a\u90a3\u6761\u53e3\u8bc0\u5728 InnoDB \u91cc\u4e0d\u6210\u7acb，\u522b\u80cc\u3002<\/p>\n

\u4f18\u5316\u5668\u5224\u65ad\u5168\u8868\u66f4\u5212\u7b97<\/h3>\n

\u9664\u4e86\u4e0a\u9762\u51e0\u79cd，\u8fd8\u6709\u51e0\u79cd\u5e38\u89c1\u60c5\u5f62\u4f1a\u8ba9\u4f18\u5316\u5668\u76f4\u63a5\u9009\u5168\u8868\u626b\u63cf：<\/p>\n\n\u60c5\u5f62\u539f\u56e0<\/tr>\n\n\n\n\n
\u8868\u672c\u8eab\u5f88\u5c0f<\/td>\n\u8d70\u7d22\u5f15\u8981\u5148\u67e5\u7d22\u5f15\u518d\u56de\u8868，\u6bd4\u987a\u5e8f\u626b\u5168\u8868\u8fd8\u6162<\/td>\n<\/tr>\n
\u5217\u7684\u533a\u5206\u5ea6\u4f4e（\u5982\u6027\u522b）<\/td>\n\u51e0\u4e4e\u6bcf\u884c\u90fd\u8981\u8bfb，\u7d22\u5f15\u6ca1\u8d77\u5230\u8fc7\u6ee4\u4f5c\u7528<\/td>\n<\/tr>\n
\u67e5\u7684\u5217\u591a\u3001\u547d\u4e2d\u884c\u591a<\/td>\n\u6bcf\u884c\u90fd\u8981\u56de\u8868，\u968f\u673a IO，\u4e0d\u5982\u987a\u5e8f\u626b<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u7b2c\u4e09\u70b9\u91cc\u6700\u5e38\u89c1\u7684\u8bf1\u56e0\u662f select *\u3002\u5982\u679c\u67e5\u8be2\u7528\u5230\u7684\u5217\u6070\u597d\u90fd\u5728\u7d22\u5f15\u91cc（\u8986\u76d6\u7d22\u5f15），\u5c31\u7701\u6389\u4e86\u56de\u8868，\u4f18\u5316\u5668\u5f80\u5f80\u5c31\u613f\u610f\u8d70\u7d22\u5f15\u4e86\u3002\u524d\u9762\u4e00\u6761 SQL \u90a3\u7bc7\u91cc\u8bb2\u56de\u8868 \u7684\u65f6\u5019\u63d0\u8fc7\u8fd9\u4e00\u70b9\u3002<\/p>\n

\n

\u600e\u4e48\u786e\u8ba4\u5230\u5e95\u8d70\u6ca1\u8d70<\/h2>\n

\u4e0a\u9762\u5f88\u591a"\u5931\u6548"\u5f52\u6839\u5230\u5e95\u662f\u4f18\u5316\u5668\u7684\u53d6\u820d，\u5149\u770b SQL \u731c\u4e0d\u51c6，\u6211\u4eec\u76f4\u63a5\u770b\u6267\u884c\u8ba1\u5212：<\/p>\n

explain<\/span> select<\/span> *<\/span> from<\/span> t where<\/span> a =<\/span> 1<\/span> and<\/span> b ><\/span> 2<\/span>;<\/span><\/p>\n

\u91cd\u70b9\u770b\u4e09\u5217：<\/p>\n\n\u5217\u770b\u4ec0\u4e48<\/tr>\n\n\n\n\n
type<\/td>\n\u8bbf\u95ee\u65b9\u5f0f，ALL \u5c31\u662f\u5168\u8868\u626b\u63cf；range\u3001ref\u3001eq_ref\u3001const \u662f\u7531\u5dee\u5230\u597d<\/td>\n<\/tr>\n
key<\/td>\n\u5b9e\u9645\u7528\u5230\u7684\u7d22\u5f15，NULL \u8868\u793a\u6ca1\u8d70\u7d22\u5f15<\/td>\n<\/tr>\n
rows<\/td>\n\u9884\u4f30\u8981\u626b\u63cf\u7684\u884c\u6570，\u8d8a\u5c0f\u8d8a\u597d<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

type = ALL \u6216\u8005 key = NULL，\u5c31\u662f\u6ca1\u8d70\u7d22\u5f15\u3002\u8fd9\u4e2a\u5224\u65ad\u63a5\u7684\u5c31\u662f\u4e0a\u4e00\u7bc7\u91cc\u4f18\u5316\u5668\u8f93\u51fa\u7684\u90a3\u4efd\u6267\u884c\u8ba1\u5212\u3002<\/p>\n

\u5982\u679c\u786e\u8ba4\u4f18\u5316\u5668\u9009\u9519\u4e86\u7d22\u5f15（\u7edf\u8ba1\u4fe1\u606f\u4e0d\u51c6\u5bfc\u81f4\u7684），\u53ef\u4ee5\u7528 analyze table \u91cd\u65b0\u6536\u96c6\u7edf\u8ba1\u4fe1\u606f，\u6216\u8005\u7528 force index \u5f3a\u5236\u6307\u5b9a，\u4f46\u540e\u8005\u5c5e\u4e8e\u6253\u8865\u4e01，\u5148\u60f3\u6e05\u695a\u4f18\u5316\u5668\u4e3a\u4ec0\u4e48\u4e0d\u7528\u5b83\u3002<\/p>\n

\n

\u901f\u67e5\u8868<\/h2>\n\n\u573a\u666f\u4f8b\u5b50\u4e3a\u4ec0\u4e48\u5931\u6548<\/tr>\n\n\n\n\n\n\n\n\n\n\n
\u5217\u4e0a\u6709\u51fd\u6570<\/td>\nwhere date(t) = '2024-01-01'<\/td>\n\u7d22\u5f15\u5b58\u7684\u662f\u539f\u503c，\u7b97\u8fc7\u7684\u503c\u6ca1\u6cd5\u5b9a\u4f4d<\/td>\n<\/tr>\n
\u5217\u4e0a\u6709\u8fd0\u7b97<\/td>\nwhere id + 1 = 10<\/td>\n\u540c\u4e0a<\/td>\n<\/tr>\n
\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362<\/td>\nvarchar \u5217 = 13800000000<\/td>\n\u5217\u88ab\u9690\u5f0f\u8f6c\u6210\u6570\u5b57，\u76f8\u5f53\u4e8e\u5957\u4e86\u51fd\u6570<\/td>\n<\/tr>\n
\u4e0d\u6ee1\u8db3\u6700\u5de6\u524d\u7f00<\/td>\n\u7d22\u5f15 (a,b)，where b = 1<\/td>\n\u8df3\u8fc7\u4e86\u6392\u5e8f\u7684\u7b2c\u4e00\u5217<\/td>\n<\/tr>\n
\u8303\u56f4\u4e4b\u540e\u7684\u5217<\/td>\na=1 and b>2 and c=3<\/td>\n\u8303\u56f4\u5185 c \u4e0d\u518d\u6709\u5e8f<\/td>\n<\/tr>\n
\u524d\u5bfc\u6a21\u7cca<\/td>\nlike '%abc'<\/td>\n\u524d\u7f00\u4e0d\u5b9a，\u6ca1\u6cd5\u5b9a\u4f4d\u533a\u95f4<\/td>\n<\/tr>\n
or \u4e00\u4fa7\u65e0\u7d22\u5f15<\/td>\na = 1 or b = 2<\/td>\n\u53e6\u4e00\u4fa7\u5f97\u5168\u8868\u626b，\u7d22\u6027\u6574\u4f53\u5168\u8868<\/td>\n<\/tr>\n
\u5426\u5b9a\u6761\u4ef6<\/td>\n!=\u3001not in<\/td>\n\u547d\u4e2d\u884c\u6bd4\u4f8b\u9ad8，\u56de\u8868\u4e0d\u5212\u7b97<\/td>\n<\/tr>\n
\u533a\u5206\u5ea6\u4f4e \/ \u8868\u5c0f<\/td>\n\u6027\u522b\u5217\u3001\u5c0f\u8868<\/td>\n\u8d70\u7d22\u5f15\u4e0d\u5212\u7b97，\u4f18\u5316\u5668\u4e3b\u52a8\u653e\u5f03<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

\u4e0a\u4e00\u7bc7\u8bb2\u6267\u884c\u5668\u7684\u65f6\u5019\u8bf4\u8fc7，\u6709\u6ca1\u6709\u7d22\u5f15，\u51b3\u5b9a\u4e86\u6267\u884c\u5668\u662f\\”\u4e00\u884c\u884c\u53d6\u56de\u6765\u81ea\u5df1\u5224\u65ad\\”\u8fd8\u662f\\”\u8ba9\u5f15\u64ce\u76f4\u63a5\u5b9a\u4f4d\u5230\u76ee\u6807\u884c\\”\u3002\u7d22\u5f15\u80fd\u8d77\u4f5c\u7528\u7684\u524d\u63d0\u53ea\u6709\u4e00\u6761：\u6761\u4ef6\u80fd\u62ff\u6765\u5b9a\u4f4d\u3002
\nInnoDB \u7684\u7d22\u5f15\u662f\u4e00\u68f5\u6309\u5217\u503c\u6392\u597d\u5e8f\u7684 B \u6811，\u9760\u7684\u5c31\u662f\u8fd9\u4e2a\u987a\u5e8f\u53bb\u7f29\u5c0f\u67e5\u627e\u8303\u56f4\u3002\u53ea\u8981\u5199\u6cd5\u7834\u574f\u4e86\u8fd9\u4e2a\u987a\u5e8f，\u6216\u8005\u8ba9\u67d0\u4e00\u5217\u7684\u503c\u6ca1\u6cd5\u6309\u539f\u6837\u6bd4\u8f83，\u7d22\u5f15\u5c31\u5b9a\u4f4d\u4e0d\u4e86，\u53ea\u80fd\u9000\u56de\u5168\u8868\u626b\u63cf\u3002\u53e6\u5916\u8fd8\u6709\u4e00\u7c7b\u60c5\u51b5\u662f\u6761\u4ef6\u672c\u8eab\u6ca1\u95ee\u9898，\u4f46\u4f18\u5316\u5668<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[114,100],"topic":[],"class_list":["post-115107","post","type-post","status-publish","format-standard","hentry","category-server","tag-mysql","tag-100"],"yoast_head":"\nMySQL\u7d22\u5f15\u5931\u6548\u7684\u573a\u666f\u603b\u7ed3 - 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