{"id":315799,"date":"2024-01-18T21:07:17","date_gmt":"2024-01-18T13:07:17","guid":{"rendered":"https:\/\/www.idc.net\/help\/315799\/"},"modified":"2024-01-18T21:07:17","modified_gmt":"2024-01-18T13:07:17","slug":"mysql%e6%95%b0%e6%8d%ae%e5%ba%93%e4%bc%98%e5%8c%96sql%e8%af%ad%e5%8f%a5%e7%9a%84%e6%ad%a5%e9%aa%a44","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/315799\/","title":{"rendered":"MySQL\u6570\u636e\u5e93\u4f18\u5316SQL\u8bed\u53e5\u7684\u6b65\u9aa44"},"content":{"rendered":"

\u4ee5\u4e0a\u7684\u6587\u7ae0\u6211\u4eec\u8bb2\u8fc7MySQL\u6570\u636e\u5e93\u4f18\u5316SQL\u8bed\u53e5\u7684\u524d\u4e09\u6b65\u9aa4\uff0c\u4eca\u5929\u6211\u4eec\u5c31\u548c\u5927\u5bb6\u4e00\u8d77\u6765\u8bb2\u8ff0MySQL\u6570\u636e\u5e93\u4f18\u5316SQL\u8bed\u53e5\u7684\u5b9e\u9645\u64cd\u4f5c\u7684\u7b2c\u56db\u6b65\u9aa4\uff0c\u4ee5\u4e0b\u5c31\u662f\u6587\u7ae0\u7684\u5177\u4f53\u5185\u5bb9\u63cf\u8ff0\uff0c\u671b\u4f60\u5728\u6d4f\u89c8\u4e4b\u540e\u4f1a\u6709\u6240\u6536\u83b7\u3002<\/p>\n

1:\u7d22\u5f15\u7684\u4f7f\u7528,\u7d22\u5f15\u7684\u91cd\u8981\u6027\u5c31\u4e0d\u8bf4\u4e86,\u529f\u80fd\u4e5f\u4e0d\u8bf4\u4e86,\u53ea\u8bf4\u600e\u4e48\u505a. \u9996\u5148\u8981\u660e\u786e\u6240\u6709\u7684MySQL(\u548cPHP\u642d\u914d\u4e4b\u6700\u4f73\u7ec4\u5408)\u7d22\u5f15(Prima(\u6700\u5b8c\u5584\u7684\u865a\u62df\u4e3b\u673a\u7ba1\u7406\u7cfb\u7edf)ry,unique,index)\u5728b\u6811\u4e2d\u6709\u5b58\u50a8.\u7d22\u5f15\u4e3b\u8981\u7528\u8bed:<\/p>\n

a:\u5feb\u901f\u627e\u5230where\u6307\u5b9a\u6761\u4ef6\u7684\u8bb0\u5f55 b:\u6267\u884c\u8054\u7ed3\u65f6,\u4ece\u5176\u4ed6\u8868\u68c0\u7d22\u884c c:\u5bf9\u7279\u5b9a\u7684\u7d22\u5f15\u5217\u627e\u51famax()\u548cmin()\u503c<\/p>\n

d\uff1a\u5982\u679c\u6392\u5e8f\u6216\u8005\u5206\u7ec4\u5728\u4e00\u4e2a\u53ef\u7528\u952e\u7684\u6700\u524d\u9762\u52a0\u524d\u7f00\uff0c\u6392\u5e8f\u6216\u5206\u7ec4\u4e00\u4e2a\u8868<\/p>\n

e\uff1a\u4e00\u4e2a\u67e5\u8be2\u53ef\u80fd\u88ab\u7528\u6765MySQL\u6570\u636e\u5e93\u4f18\u5316\u68c0\u7d22\u503c\uff0c\u800c\u4e0d\u7528\u8bbf\u95ee\u6570\u636e\u6587\u4ef6\uff0e\u5982\u679c\u67d0\u4e9b\u8868\u7684\u5217\u662f\u6570\u5b57\u578b\u5e76\u4e14\u6b63\u597d\u662f\u67d0\u4e2a\u5217\u7684\u524d\u7f00\uff0c\u4e3a\u4e86\u66f4\u5feb\uff0c\u503c\u53ef\u4ee5\u4ece\u7d22\u5f15\u6811\u4e2d\u53d6\u51fa<\/p>\n

\uff12\uff1a\u5b58\u50a8\u6216\u8005\u66f4\u65b0\u6570\u636e\u7684\u67e5\u8be2\u901f\u5ea6 \u3000grant\u7684\u6267\u884c\u4f1a\u7a0d\u7a0d\u7684\u51cf\u4f4e\u6548\u7387\uff0e<\/p>\n

MySQL(\u548cPHP\u642d\u914d\u4e4b\u6700\u4f73\u7ec4\u5408)\u7684\u51fd\u6570\u5e94\u8be5\u88ab\u9ad8\u5ea6\u7684\u4f18\u5316\uff0e\u53ef\u4ee5\u7528benchmark\uff08loop_count,expression)\u6765\u627e\u51fa\u662f\u5426\u67e5\u8be2\u6709\u95ee\u9898<\/p>\n

select\u7684\u67e5\u8be2\u901f\u5ea6\uff1a\u5982\u679c\u60f3\u8981\u8ba9\u4e00\u4e2aselect\uff0e\uff0e\uff0ewhere\uff0e\uff0e\uff0e\u66f4\u5feb\uff0c\u6211\u80fd\u60f3\u5230\u7684\u53ea\u6709\u5efa\u7acb\u7d22\u5f15\uff0e\u53ef\u4ee5\u5728\u4e00\u4e2a\u8868\u4e0a\u8fd0\u884cmyisamchk\uff0d\uff0danalyze\u6765\u66f4\u597d\u7684MySQL\u6570\u636e\u5e93\u4f18\u5316\u67e5\u8be2\uff0e\u53ef\u4ee5\u7528myisamchk\uff0d\uff0dsort\uff0dindex\uff0d\uff0dsort\uff0drecords\uff1d\uff11\u6765\u8bbe\u7f6e\u7528\u4e00\u4e2a\u7d22\u5f15\u6392\u5e8f\u4e00\u4e2a\u7d22\u5f15\u548c\u6570\u636e\uff0e<\/p>\n

\uff13\uff1aMySQL(\u548cPHP\u642d\u914d\u4e4b\u6700\u4f73\u7ec4\u5408)\u4f18\u5316where\u5b50\u53e5<\/p>\n

3.\uff11\uff1a\u5220\u9664\u4e0d\u5fc5\u8981\u7684\u62ec\u53f7\uff1a<\/p>\n

\uff08\uff08a AND b) AND c OR (((a AND b) AND (a AND d))))>(a AND b AND c) OR (a AND b AND c AND d)<\/p>\n

3.2:\u4f7f\u7528\u5e38\u6570<\/p>\n

\uff08ab>5 AND b=c AND a=5<\/p>\n

3.3:\u5220\u9664\u5e38\u6570\u6761\u4ef6<\/p>\n

\uff08b>=5 AND b=5) OR (b=6 AND 5=5) OR (b=100 AND 2=3) >b=5 OR b=6<\/p>\n

3.4:\u7d22\u5f15\u4f7f\u7528\u7684\u5e38\u6570\u8868\u8fbe\u5f0f\u4ec5\u8ba1\u7b97\u4e00\u6b21<\/p>\n

3.5\uff1a\u5728\u4e00\u4e2a\u8868\u4e2d\uff0c\u6ca1\u6709\u4e00\u4e2awhere\u7684count(*)\u76f4\u63a5\u4ece\u8868\u4e2d\u68c0\u7d22\u4fe1\u606f<\/p>\n

3.6:\u6240\u6709\u5e38\u6570\u7684\u8868\u5728\u67e5\u8be2\u4e2d\u5728\u4efb\u4f55\u5176\u4ed6\u8868\u4e4b\u524d\u8bfb\u51fa<\/p>\n

3.7:\u5bf9\u5916\u8054\u7ed3\u8868\u6700\u597d\u8054\u7ed3\u7ec4\u5408\u662f\u5c1d\u8bd5\u4e86\u6240\u6709\u53ef\u80fd\u6027\u627e\u5230\u7684
 <\/p>\n

3.8\uff1a\u5982\u679c\u6709\u4e00\u4e2aorder\u3000by\u5b57\u53e5\u548c\u4e00\u4e2a\u4e0d\u540c\u7684group\u3000by\u5b50\u53e5\u6216\u8005order\u3000by\u6216\u8005group\u3000by\u5305\u542b\u4e0d\u662f\u6765\u81ea\u8054\u7ed3\u7684\u7b2c\u4e00\u4e2a\u8868\u7684\u5217\uff0c\u90a3\u4e48\u521b\u5efa\u4e00\u4e2a\u4e34\u65f6\u8868<\/p>\n

3.9:\u5982\u679c\u4f7f\u7528\u4e86sql_small_result\uff0c\u90a3\u4e48msyql\u4f7f\u7528\u5728\u5185\u5b58\u4e2d\u7684\u4e00\u4e2a\u8868<\/p>\n

3.10:\u6bcf\u4e2a\u8868\u7684\u7d22\u5f15\u7ed9\u67e5\u8be2\u5e76\u4e14\u4f7f\u7528\u8de8\u8d8a\u5c11\u4e8e\uff13\uff10\uff05\u7684\u884c\u7684\u7d22\u5f15\uff0e<\/p>\n

3.11\u5728\u6bcf\u4e2a\u8bb0\u5f55\u8f93\u51fa\u524d\uff0c\u8df3\u8fc7\u4e0d\u5339\u914dhaving\u5b50\u53e5\u7684\u884c<\/p>\n

\uff14\uff1aMySQL\u6570\u636e\u5e93\u4f18\u5316left\u3000join<\/p>\n

\u5728MySQL(\u548cPHP\u642d\u914d\u4e4b\u6700\u4f73\u7ec4\u5408)\u4e2d\u3000a left join b\u6309\u4ee5\u4e0b\u65b9\u5f0f\u5b9e\u73b0<\/p>\n

a\uff1a\u8868b\u4f9d\u8d56\u4e8e\u8868a\u3000<\/p>\n

b\uff1a\u8868a\u4f9d\u8d56\u4e8e\u6240\u6709\u7528\u5728left\u3000join\u6761\u4ef6\u7684\u8868\uff08\u9664\u4e86b\uff09<\/p>\n

c\uff1a\u6240\u6709left\u3000join\u6761\u4ef6\u88ab\u79fb\u5230where\u5b50\u53e5\u4e2d<\/p>\n

d\uff1a\u8fdb\u884c\u6240\u6709\u7684\u8054\u7ed3MySQL\u6570\u636e\u5e93\u4f18\u5316\uff0c\u9664\u4e86\u4e00\u4e2a\u8868\u603b\u662f\u5728\u6240\u6709\u4ed6\u4f9d\u8d56\u7684\u8868\u540e\u8bfb\u53d6\uff0e\u5982\u679c\u6709\u4e00\u4e2a\u5faa\u73af\u4f9d\u8d56\uff0c\u90a3\u4e48\u5c06\u53d1\u751f\u9519\u8bef<\/p>\n

e\uff1a\u8fdb\u884c\u6240\u6709\u7684\u6807\u51c6\u7684where\u4f18\u5316 f\uff1a\u5982\u679c\u5728a\u4e2d\u6709\u4e00\u884c\u5339\u914dwhere\u5b50\u53e5\uff0c\u4f46\u662f\u5728b\u4e2d\u6ca1\u6709\u4efb\u4f55\u5339\u914dleft\u3000join\u6761\u4ef6\uff0c\u90a3\u4e48\uff0c\u5728b\u4e2d\u751f\u6210\u7684\u6240\u6709\u8bbe\u7f6e\u4e3a\uff2e\uff35\uff2c\uff2c\u7684\u4e00\u884c<\/p>\n

g\uff1a\u5982\u679c\u4f7f\u7528left\u3000join\u6765\u627e\u51fa\u67d0\u4e9b\u8868\u4e2d\u4e0d\u5b58\u5728\u7684\u884c\u5e76\u4e14\u5728where\u90e8\u5206\u6709column_name IS NULL\u6d4b\u8bd5(column_name\u4e3aNOT NULL\u5217)\uff0e\u90a3\u4e48\uff0cMySQL(\u548cPHP\u642d\u914d\u4e4b\u6700\u4f73\u7ec4\u5408)\u5728\u5b83\u5df2\u7ecf\u627e\u5230\u4e86\u5339\u914dleft\u3000join\u6761\u4ef6\u7684\u4e00\u884c\u540e\uff0c\u5c06\u505c\u6b62\u5728\u66f4\u591a\u7684\u884c\u540e\u5bfb\u627e<\/p>\n

\uff15\uff1aMySQL\u6570\u636e\u5e93\u4f18\u5316limit<\/p>\n

a\uff1a\u5982\u679c\u7528limit\u53ea\u9009\u62e9\u4e00\u884c\uff0c\u5f53MySQL(\u548cPHP\u642d\u914d\u4e4b\u6700\u4f73\u7ec4\u5408)\u9700\u8981\u626b\u63cf\u6574\u4e2a\u8868\u65f6\uff0c\u5b83\u7684\u4f5c\u7528\u76f8\u5f53\u4e8e\u7d22\u5f15<\/p>\n

b\uff1a\u5982\u679c\u4f7f\u7528limit\uff03\u4e0eorder\u3000by\uff0cMySQL(\u548cPHP\u642d\u914d\u4e4b\u6700\u4f73\u7ec4\u5408)\u5982\u679c\u627e\u5230\u4e86\u7b2c\uff03\u884c\uff0c\u5c06\u7ed3\u675f\u6392\u5e8f\uff0c\u800c\u4e0d\u4f1a\u6392\u5e8f\u6b63\u4e2a\u8868<\/p>\n

c\uff1a\u5f53\u7ed3\u5408limit\uff03\u548cdistinct\u65f6\uff0cMySQL(\u548cPHP\u642d\u914d\u4e4b\u6700\u4f73\u7ec4\u5408)\u5982\u679c\u627e\u5230\u4e86\u7b2c\uff03\u884c\uff0c\u5c06\u505c\u6b62<\/p>\n

d\uff1a\u53ea\u8981MySQL(\u548cPHP\u642d\u914d\u4e4b\u6700\u4f73\u7ec4\u5408)\u5df2\u7ecf\u53d1\u9001\u4e86\u7b2c\u4e00\u4e2a\uff03\u884c\u5230\u5ba2\u6237\uff0cMySQL(\u548cPHP\u642d\u914d\u4e4b\u6700\u4f73\u7ec4\u5408)\u5c06\u653e\u5f03\u67e5\u8be2<\/p>\n

e\uff1alimit 0\u4e00\u76f4\u4f1a\u5f88\u5feb\u7684\u8fd4\u56de\u4e00\u4e2a\u7a7a\u96c6\u5408\uff0e<\/p>\n

f\uff1a\u4e34\u65f6\u8868\u7684\u5927\u5c0f\u4f7f\u7528limit\uff03\u8ba1\u7b97\u9700\u8981\u591a\u5c11\u7a7a\u95f4\u6765\u89e3\u51b3\u67e5\u8be2<\/p>\n

\uff16\uff1aMySQL\u6570\u636e\u5e93\u4f18\u5316insert<\/p>\n

\u63d2\u5165\u4e00\u6761\u8bb0\u5f55\u7684\u662f\u7531\u4ee5\u4e0b\u6784\u6210\uff1a<\/p>\n

a:\u8fde\u63a5\uff08\uff13\uff09<\/p>\n

b:\u53d1\u9001\u67e5\u8be2\u7ed9\u670d\u52a1\u5668\uff08\uff12\uff09<\/p>\n

c:\u5206\u6790\u67e5\u8be2\uff08\uff12\uff09<\/p>\n

d:\u63d2\u5165\u8bb0\u5f55\uff08\uff11*\u8bb0\u5f55\u5927\u5c0f\uff09<\/p>\n

e\uff1a\u63d2\u5165\u7d22\u5f15\uff08\uff11*\u7d22\u5f15\uff09<\/p>\n

f\uff1a\u5173\u95ed\uff08\uff11\uff09<\/p>\n

\u4ee5\u4e0a\u6570\u5b57\u53ef\u4ee5\u770b\u6210\u548c\u603b\u65f6\u95f4\u6210\u6bd4\u4f8b<\/p>\n

\u6539\u5584\u63d2\u5165\u901f\u5ea6\u7684\u4e00\u4e9b\u65b9\u6cd5\uff1a<\/p>\n

6.1\uff1a\u5982\u679c\u540c\u65f6\u4ece\u4e00\u4e2a\u8fde\u63a5\u63d2\u5165\u8bb8\u591a\u884c\uff0c\u4f7f\u7528\u591a\u4e2a\u503c\u7684insert\uff0c\u8fd9\u6bd4\u7528\u591a\u4e2a\u8bed\u53e5\u8981\u5feb<\/p>\n

6.2\uff1a\u5982\u679c\u4ece\u4e0d\u540c\u8fde\u63a5\u63d2\u5165\u5f88\u591a\u884c\uff0c\u4f7f\u7528insert\u3000delayed\u8bed\u53e5\u901f\u5ea6\u66f4\u5feb<\/p>\n

6.3: \u7528myisam\uff0c\u5982\u679c\u5728\u8868\u4e2d\u6ca1\u6709\u5220\u9664\u7684\u884c\uff0c\u80fd\u5728select\uff1as\u6b63\u5728\u8fd0\u884c\u7684\u540c\u65f6\u63d2\u5165\u884c<\/p>\n

6.4: \u5f53\u4ece\u4e00\u4e2a\u6587\u672c\u6587\u4ef6\u88c5\u8f7d\u4e00\u4e2a\u8868\u65f6\uff0c\u7528load\u3000data\u3000infile\uff0e\u8fd9\u4e2a\u901a\u5e38\u6bd4insert\u5feb20 \u500d
3.6:\u6240\u6709\u5e38\u6570\u7684\u8868\u5728\u67e5\u8be2\u4e2d\u5728\u4efb\u4f55\u5176\u4ed6\u8868\u4e4b\u524d\u8bfb\u51fa<\/p>\n

3.7:\u5bf9\u5916\u8054\u7ed3\u8868\u6700\u597d\u8054\u7ed3\u7ec4\u5408\u662f\u5c1d\u8bd5\u4e86\u6240\u6709\u53ef\u80fd\u6027\u627e\u5230\u7684
 <\/p>\n

3.8\uff1a\u5982\u679c\u6709\u4e00\u4e2aorder\u3000by\u5b57\u53e5\u548c\u4e00\u4e2a\u4e0d\u540c\u7684group\u3000by\u5b50\u53e5\u6216\u8005order\u3000by\u6216\u8005group\u3000by\u5305\u542b\u4e0d\u662f\u6765\u81ea\u8054\u7ed3\u7684\u7b2c\u4e00\u4e2a\u8868\u7684\u5217\uff0c\u90a3\u4e48\u521b\u5efa\u4e00\u4e2a\u4e34\u65f6\u8868<\/p>\n

3.9:\u5982\u679c\u4f7f\u7528\u4e86sql_small_result\uff0c\u90a3\u4e48msyql\u4f7f\u7528\u5728\u5185\u5b58\u4e2d\u7684\u4e00\u4e2a\u8868<\/p>\n

3.10:\u6bcf\u4e2a\u8868\u7684\u7d22\u5f15\u7ed9\u67e5\u8be2\u5e76\u4e14\u4f7f\u7528\u8de8\u8d8a\u5c11\u4e8e\uff13\uff10\uff05\u7684\u884c\u7684\u7d22\u5f15\uff0e<\/p>\n

3.11\u5728\u6bcf\u4e2a\u8bb0\u5f55\u8f93\u51fa\u524d\uff0c\u8df3\u8fc7\u4e0d\u5339\u914dhaving\u5b50\u53e5\u7684\u884c<\/p>\n

\uff14\uff1aMySQL\u6570\u636e\u5e93\u4f18\u5316left\u3000join<\/p>\n

\u5728MySQL(\u548cPHP\u642d\u914d\u4e4b\u6700\u4f73\u7ec4\u5408)\u4e2d\u3000a left join b\u6309\u4ee5\u4e0b\u65b9\u5f0f\u5b9e\u73b0<\/p>\n

a\uff1a\u8868b\u4f9d\u8d56\u4e8e\u8868a\u3000<\/p>\n

b\uff1a\u8868a\u4f9d\u8d56\u4e8e\u6240\u6709\u7528\u5728left\u3000join\u6761\u4ef6\u7684\u8868\uff08\u9664\u4e86b\uff09<\/p>\n

c\uff1a\u6240\u6709left\u3000join\u6761\u4ef6\u88ab\u79fb\u5230where\u5b50\u53e5\u4e2d<\/p>\n

d\uff1a\u8fdb\u884c\u6240\u6709\u7684\u8054\u7ed3\u4f18\u5316\uff0c\u9664\u4e86\u4e00\u4e2a\u8868\u603b\u662f\u5728\u6240\u6709\u4ed6\u4f9d\u8d56\u7684\u8868\u540e\u8bfb\u53d6\uff0e\u5982\u679c\u6709\u4e00\u4e2a\u5faa\u73af\u4f9d\u8d56\uff0c\u90a3\u4e48\u5c06\u53d1\u751f\u9519\u8bef<\/p>\n

e\uff1a\u8fdb\u884c\u6240\u6709\u7684\u6807\u51c6\u7684where\u4f18\u5316 f\uff1a\u5982\u679c\u5728a\u4e2d\u6709\u4e00\u884c\u5339\u914dwhere\u5b50\u53e5\uff0c\u4f46\u662f\u5728b\u4e2d\u6ca1\u6709\u4efb\u4f55\u5339\u914dleft\u3000join\u6761\u4ef6\uff0c\u90a3\u4e48\uff0c\u5728b\u4e2d\u751f\u6210\u7684\u6240\u6709\u8bbe\u7f6e\u4e3a\uff2e\uff35\uff2c\uff2c\u7684\u4e00\u884c<\/p>\n

g\uff1a\u5982\u679c\u4f7f\u7528left\u3000join\u6765\u627e\u51fa\u67d0\u4e9b\u8868\u4e2d\u4e0d\u5b58\u5728\u7684\u884c\u5e76\u4e14\u5728where\u90e8\u5206\u6709column_name IS NULL\u6d4b\u8bd5(column_name\u4e3aNOT NULL\u5217)\uff0e\u90a3\u4e48\uff0cMySQL(\u548cPHP\u642d\u914d\u4e4b\u6700\u4f73\u7ec4\u5408)\u5728\u5b83\u5df2\u7ecf\u627e\u5230\u4e86\u5339\u914dleft\u3000join\u6761\u4ef6\u7684\u4e00\u884c\u540e\uff0c\u5c06\u505c\u6b62\u5728\u66f4\u591a\u7684\u884c\u540e\u5bfb\u627e<\/p>\n

\uff15\uff1aMySQL\u6570\u636e\u5e93\u4f18\u5316limit<\/p>\n

a\uff1a\u5982\u679c\u7528limit\u53ea\u9009\u62e9\u4e00\u884c\uff0c\u5f53MySQL(\u548cPHP\u642d\u914d\u4e4b\u6700\u4f73\u7ec4\u5408)\u9700\u8981\u626b\u63cf\u6574\u4e2a\u8868\u65f6\uff0c\u5b83\u7684\u4f5c\u7528\u76f8\u5f53\u4e8e\u7d22\u5f15<\/p>\n

b\uff1a\u5982\u679c\u4f7f\u7528limit\uff03\u4e0eorder\u3000by\uff0cMySQL(\u548cPHP\u642d\u914d\u4e4b\u6700\u4f73\u7ec4\u5408)\u5982\u679c\u627e\u5230\u4e86\u7b2c\uff03\u884c\uff0c\u5c06\u7ed3\u675f\u6392\u5e8f\uff0c\u800c\u4e0d\u4f1a\u6392\u5e8f\u6b63\u4e2a\u8868<\/p>\n

c\uff1a\u5f53\u7ed3\u5408limit\uff03\u548cdistinct\u65f6\uff0cMySQL(\u548cPHP\u642d\u914d\u4e4b\u6700\u4f73\u7ec4\u5408)\u5982\u679c\u627e\u5230\u4e86\u7b2c\uff03\u884c\uff0c\u5c06\u505c\u6b62<\/p>\n

d\uff1a\u53ea\u8981MySQL(\u548cPHP\u642d\u914d\u4e4b\u6700\u4f73\u7ec4\u5408)\u5df2\u7ecf\u53d1\u9001\u4e86\u7b2c\u4e00\u4e2a\uff03\u884c\u5230\u5ba2\u6237\uff0cMySQL(\u548cPHP\u642d\u914d\u4e4b\u6700\u4f73\u7ec4\u5408)\u5c06\u653e\u5f03\u67e5\u8be2<\/p>\n

e\uff1alimit 0\u4e00\u76f4\u4f1a\u5f88\u5feb\u7684\u8fd4\u56de\u4e00\u4e2a\u7a7a\u96c6\u5408\uff0e<\/p>\n

f\uff1a\u4e34\u65f6\u8868\u7684\u5927\u5c0f\u4f7f\u7528limit\uff03\u8ba1\u7b97\u9700\u8981\u591a\u5c11\u7a7a\u95f4\u6765\u89e3\u51b3\u67e5\u8be2<\/p>\n

\uff16\uff1aMySQL\u6570\u636e\u5e93\u4f18\u5316insert<\/p>\n

\u63d2\u5165\u4e00\u6761\u8bb0\u5f55\u7684\u662f\u7531\u4ee5\u4e0b\u6784\u6210\uff1a<\/p>\n

a:\u8fde\u63a5\uff08\uff13\uff09<\/p>\n

b:\u53d1\u9001\u67e5\u8be2\u7ed9\u670d\u52a1\u5668\uff08\uff12\uff09<\/p>\n

c:\u5206\u6790\u67e5\u8be2\uff08\uff12\uff09<\/p>\n

d:\u63d2\u5165\u8bb0\u5f55\uff08\uff11*\u8bb0\u5f55\u5927\u5c0f\uff09<\/p>\n

e\uff1a\u63d2\u5165\u7d22\u5f15\uff08\uff11*\u7d22\u5f15\uff09<\/p>\n

f\uff1a\u5173\u95ed\uff08\uff11\uff09<\/p>\n

\u4ee5\u4e0a\u6570\u5b57\u53ef\u4ee5\u770b\u6210\u548c\u603b\u65f6\u95f4\u6210\u6bd4\u4f8b<\/p>\n

\u6539\u5584\u63d2\u5165\u901f\u5ea6\u7684\u4e00\u4e9b\u65b9\u6cd5\uff1a<\/p>\n

6.1\uff1a\u5982\u679c\u540c\u65f6\u4ece\u4e00\u4e2a\u8fde\u63a5\u63d2\u5165\u8bb8\u591a\u884c\uff0c\u4f7f\u7528\u591a\u4e2a\u503c\u7684insert\uff0c\u8fd9\u6bd4\u7528\u591a\u4e2a\u8bed\u53e5\u8981\u5feb<\/p>\n

6.2\uff1a\u5982\u679c\u4ece\u4e0d\u540c\u8fde\u63a5\u63d2\u5165\u5f88\u591a\u884c\uff0c\u4f7f\u7528insert\u3000delayed\u8bed\u53e5\u901f\u5ea6\u66f4\u5feb<\/p>\n

6.3: \u7528myisam\uff0c\u5982\u679c\u5728\u8868\u4e2d\u6ca1\u6709\u5220\u9664\u7684\u884c\uff0c\u80fd\u5728select\uff1as\u6b63\u5728\u8fd0\u884c\u7684\u540c\u65f6\u63d2\u5165\u884c<\/p>\n

6.4: \u5f53\u4ece\u4e00\u4e2a\u6587\u672c\u6587\u4ef6\u88c5\u8f7d\u4e00\u4e2a\u8868\u65f6\uff0c\u7528load\u3000data\u3000infile\uff0e\u8fd9\u4e2a\u901a\u5e38\u6bd4insert\u5feb20 \u500d <\/p>\n

6.5:\u53ef\u4ee5\u9501\u5b9a\u8868\u7136\u540e\u63d2\u5165\uff0d\uff0d\u4e3b\u8981\u7684\u901f\u5ea6\u5dee\u522b\u662f\u5728\u6240\u6709insert\u8bed\u53e5\u5b8c\u6210\u540e\uff0c\u7d22\u5f15\u7f13\u51b2\u533a\u4ec5\u88ab\u5b58\u5165\u5230\u786c\u76d8\u4e00\u6b21\uff0e\u4e00\u822c\u4e0e\u6709\u4e0d\u540c\u7684insert\u8bed\u53e5\u90a3\u6837\u591a\u6b21\u5b58\u5165\u8981\u5feb\uff0e\u5982\u679c\u80fd\u7528\u4e00\u4e2a\u5355\u4e2a\u8bed\u53e5\u63d2\u5165\u6240\u6709\u7684\u884c\uff0c\u9501\u5b9a\u5c31\u4e0d\u9700\u8981\uff0e\u9501\u5b9a\u4e5f\u964d\u4f4e\u8fde\u63a5\u7684\u6574\u4f53\u65f6\u95f4\uff0e\u4f46\u662f\u5bf9\u67d0\u4e9b\u7ebf\u7a0b\u6700\u5927\u7b49\u5f85\u65f6\u95f4\u5c06\u4e0a\u5347\uff0e\u4f8b\u5982<\/p>\n

\n \n \n 
    \n  \n  \n  
  1. thread 1 does 1000 inserts  <\/span><\/span><\/li>\n  \n  \n  
  2. thread 2,3 and 4 does 1 insert  <\/span><\/li>\n  \n  \n  
  3. thread 5 does 1000 inserts  <\/span><\/li>\n \n \n <\/ol><\/pre>\n
    \u5982\u679c\u4e0d\u4f7f\u7528\u9501\u5b9a\uff0c\uff12\uff0c\uff13\uff0c\uff14\u5c06\u5728\uff11\u548c\uff15\u4e4b\u524d\u5b8c\u6210\uff0e\u5982\u679c\u4f7f\u7528\u9501\u5b9a\uff0c\uff12\uff0c\uff13\uff0c\uff14\uff0c\u5c06\u53ef\u80fd\u5728\uff11\u548c\uff15\u4e4b\u540e\u5b8c\u6210\uff0e\u4f46\u662f\u6574\u4f53\u65f6\u95f4\u5e94\u8be5\u5feb\uff14\uff10\uff05\uff0e\u56e0\u4e3ainsert\uff0cupdate\uff0cdelete\u64cd\u4f5c\u5728MySQL(\u548cPHP\u642d\u914d\u4e4b\u6700\u4f73\u7ec4\u5408)\u4e2d\u662f\u5f88\u5feb\u7684\uff0c\u901a\u8fc7\u4e3a\u591a\u4e8e\u5927\u7ea6\uff15\u6b21\u8fde\u7eed\u4e0d\u65ad\u7684\u63d2\u5165\u6216\u66f4\u65b0\u4e00\u884c\u7684\u4e1c\u897f\u52a0\u9501\uff0c\u5c06\u83b7\u5f97\u66f4\u597d\u7684\u6574\u4f53\u6027\u80fd\uff0e<\/p>\n
    \u5982\u679c\u505a\u5f88\u591a\u4e00\u884c\u7684\u63d2\u5165\uff0c\u53ef\u4ee5\u505a\u4e00\u4e2alock\u3000tables\uff0c\u5076\u5c14\u968f\u540e\u505a\u4e00\u4e2aunlock\u3000tables\uff08\u5927\u7ea6\u6bcf\uff11\uff10\uff10\uff10\u884c\uff09\u4ee5\u5141\u8bb8\u53e6\u5916\u7684\u7ebf\u7a0b\u5b58\u53d6\u8868\uff0e\u8fd9\u4ecd\u7136\u5c06\u5bfc\u81f4\u83b7\u5f97\u597d\u7684\u6027\u80fd\uff0eload\u3000data\u3000infile\u5bf9\u88c5\u8f7d\u6570\u636e\u4ecd\u7136\u662f\u5f88\u5feb\u7684\uff0e<\/p>\n
     \u4e3a\u4e86\u5bf9load\u3000data\u3000infile\u548cinsert\u5f97\u5230\u4e00\u4e9b\u66f4\u5feb\u7684\u901f\u5ea6\uff0c\u6269\u5927\u5173\u952e\u5b57\u7f13\u51b2\u533a\uff0e<\/p>\n
     \uff17\u4f18\u5316update\u7684\u901f\u5ea6<\/p>\n
     \u5b83\u7684\u901f\u5ea6\u4f9d\u8d56\u4e8e\u88ab\u66f4\u65b0\u6570\u636e\u7684\u5927\u5c0f\u548c\u88ab\u66f4\u65b0\u7d22\u5f15\u7684\u6570\u91cf<\/p>\n
     \u4f7fupdate\u66f4\u5feb\u7684\u53e6\u4e00\u4e2a\u65b9\u6cd5\u662f\u63a8\u8fdf\u4fee\u6539\uff0c\u7136\u540e\u4e00\u884c\u4e00\u884c\u7684\u505a\u5f88\u591a\u4fee\u6539\uff0e\u5982\u679c\u9501\u5b9a\u8868\uff0c\u505a\u4e00\u884c\u4e00\u884c\u7684\u5f88\u591a\u4fee\u6539\u6bd4\u4e00\u6b21\u505a\u4e00\u4e2a\u5feb<\/p>\n
     \uff18MySQL\u6570\u636e\u5e93\u4f18\u5316delete\u901f\u5ea6<\/p>\n
     \u5220\u9664\u4e00\u4e2a\u8bb0\u5f55\u7684\u65f6\u95f4\u4e0e\u7d22\u5f15\u6570\u91cf\u6210\u6b63\u6bd4\uff0e\u4e3a\u4e86\u66f4\u5feb\u7684\u5220\u9664\u8bb0\u5f55\uff0c\u53ef\u4ee5\u589e\u52a0\u7d22\u5f15\u7f13\u5b58\u7684\u5927\u5c0f \u4ece\u4e00\u4e2a\u8868\u5220\u9664\u6240\u6709\u884c\u6bd4\u5220\u9664\u8fd9\u4e2a\u8868\u7684\u5927\u90e8\u5206\u8981\u5feb\u7684\u591a<\/p>\n
     \u3010\u7f16\u8f91\u63a8\u8350\u3011<\/p>\n
      \n
    1. MySQL5 master slave\u5b89\u88c5\u914d\u7f6e\u5168\u8fc7\u7a0b<\/li>\n
    2. MySQL\u9ad8\u6548\u5206\u9875\u67e5\u8be2\u7684\u5b9e\u9645\u64cd\u4f5c\u6b65\u9aa4<\/li>\n
    3. MySQL\u542f\u52a8\u65b9\u6cd5\u4e0e\u5b9e\u9645\u64cd\u4f5c\u6b65\u9aa4<\/li>\n
    4. MySQL5\u5b57\u7b26\u96c6\u95ee\u9898\u7684\u89e3\u51b3\u65b9\u6848<\/li>\n
    5. \u5982\u4f55\u7528MySQL\u641c\u7d22\u7d22\u5f15\u5b57\u6bb5\u6765\u63d0\u9ad8\u641c\u7d22\u6548\u7387<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"
      \u4ee5\u4e0a\u7684\u6587\u7ae0\u6211\u4eec\u8bb2\u8fc7MySQL\u6570\u636e\u5e93\u4f18\u5316SQL\u8bed\u53e5\u7684\u524d\u4e09\u6b65\u9aa4\uff0c\u4eca\u5929\u6211\u4eec\u5c31\u548c\u5927\u5bb6\u4e00\u8d77\u6765\u8bb2\u8ff0MySQL\u6570\u636e\u5e93\u4f18\u5316SQ […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7038],"tags":[],"class_list":["post-315799","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/315799","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=315799"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/315799\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=315799"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=315799"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=315799"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}