\u5728Apache, PHP, MySQL\u7684\u4f53\u7cfb\u67b6\u6784\u4e2d\uff0cMySQL\u5bf9\u4e8e\u6027\u80fd\u7684\u5f71\u54cd\u6700\u5927\uff0c\u4e5f\u662f\u5173\u952e\u7684\u6838\u5fc3\u90e8\u5206\u3002MySQL\u7684\u8bbe\u7f6e\u662f\u5426\u5408\u7406\u4f18\u5316\uff0c\u76f4\u63a5\u5f71\u54cd\u5230\u7f51\u7ad9\u7684\u901f\u5ea6\u548c\u627f\u8f7d\u91cf\uff01\u540c\u65f6\uff0cMySQL\u4e5f\u662f\u4f18\u5316\u96be\u5ea6\u6700\u5927\u7684\u4e00\u4e2a\u90e8\u5206\uff0c\u4e0d\u4f46\u9700\u8981\u7406\u89e3\u4e00\u4e9bMySQL\u4e13\u4e1a\u77e5\u8bc6\uff0c\u540c\u65f6\u8fd8\u9700\u8981\u957f\u65f6\u95f4\u7684\u89c2\u5bdf\u7edf\u8ba1\u5e76\u4e14\u6839\u636e\u7ecf\u9a8c\u8fdb\u884c\u5224\u65ad\uff0c\u7136\u540e\u8bbe\u7f6e\u5408\u7406\u7684\u53c2\u6570\u3002<\/p>\n
\u4e0b\u9762\u6211\u4eec\u4e86\u89e3\u4e00\u4e0bMySQL\u4f18\u5316\u7684\u4e00\u4e9b\u57fa\u7840\uff0cMySQL\u7684\u4f18\u5316\u6211\u5206\u4e3a\u4e09\u4e2a\u90e8\u5206\uff1a
\n\u4e00\u662f\u670d\u52a1\u5668\u7269\u7406\u786c\u4ef6\u7684\u4f18\u5316\uff1b
\n\u4e8c\u662f\u8f6f\u4ef6\u4f18\u5316\uff0c\u4e5f\u5c31\u662fMySQL\u81ea\u8eab(my.cnf)\u7684\u4f18\u5316\/\u8bbe\u7f6e\u4f18\u5316;
\n\u4e09\u662f\u6570\u636e\u5e93\u7684\u8bbe\u8ba1\u548c\u6570\u636e\u4fe1\u606f\u7684\u4f18\u5316\u3002<\/p>\n
\u4e0b\u9762\u5206\u522b\u8bf4\u660e\uff1a<\/p>\n
\u4e00\u3001\u670d\u52a1\u5668\u7269\u7406\u786c\u4ef6\u7684\u4f18\u5316<\/p>\n
\u670d\u52a1\u5668\u786c\u4ef6\u5bf9MySQL\u6027\u80fd\u7684\u5f71\u54cd
\na) \u78c1\u76d8\u5bfb\u9053\u80fd\u529b\uff08\u78c1\u76d8I\/O\uff09,\u4ee5\u76ee\u524d\u9ad8\u8f6c\u901fSCSI\u786c\u76d8(7200\u8f6c\/\u79d2)\u4e3a\u4f8b\uff0c\u8fd9\u79cd\u786c\u76d8\u7406\u8bba\u4e0a\u6bcf\u79d2\u5bfb\u90537200\u6b21\uff0c\u8fd9\u662f\u7269\u7406\u7279\u6027\u51b3\u5b9a\u7684\uff0c\u6ca1\u6709\u529e\u6cd5\u6539\u53d8\u3002MySQL\u6bcf\u79d2\u949f\u90fd\u5728\u8fdb\u884c\u5927\u91cf\u3001\u590d\u6742\u7684\u67e5\u8be2\u64cd\u4f5c\uff0c\u5bf9\u78c1\u76d8\u7684\u8bfb\u5199\u91cf\u53ef\u60f3\u800c\u77e5\u3002\u6240\u4ee5\uff0c\u901a\u5e38\u8ba4\u4e3a\u78c1\u76d8I\/O\u662f\u5236\u7ea6MySQL\u6027\u80fd\u7684\u6700\u5927\u56e0\u7d20\u4e4b\u4e00\uff0c\u5bf9\u4e8e\u65e5\u5747\u8bbf\u95ee\u91cf\u5728100\u4e07PV\u4ee5\u4e0a\u7684\u7f51\u7ad9\uff0c\u7531\u4e8e\u78c1\u76d8I\/O\u7684\u5236\u7ea6\uff0cMySQL\u7684\u6027\u80fd\u4f1a\u975e\u5e38\u4f4e\u4e0b\uff01\u89e3\u51b3\u8fd9\u4e00\u5236\u7ea6\u56e0\u7d20\u53ef\u4ee5\u8003\u8651\u4ee5\u4e0b\u51e0\u79cd\u89e3\u51b3\u65b9\u6848\uff1a
\n\u4f7f\u7528RAID-0+1\u78c1\u76d8\u9635\u5217\uff0c\u6ce8\u610f\u4e0d\u8981\u5c1d\u8bd5\u4f7f\u7528RAID-5\uff0cMySQL\u5728RAID-5\u78c1\u76d8\u9635\u5217\u4e0a\u7684\u6548\u7387\u4e0d\u4f1a\u50cf\u4f60\u671f\u5f85\u7684\u90a3\u6837\u5feb\uff1b \u629b\u5f03\u4f20\u7edf\u7684\u786c\u76d8\uff0c\u4f7f\u7528\u901f\u5ea6\u66f4\u5feb\u7684\u95ea\u5b58\u5f0f\u5b58\u50a8\u8bbe\u5907\u3002\u7ecf\u8fc7Discuz!\u516c\u53f8\u6280\u672f\u5de5\u7a0b\u7684\u6d4b\u8bd5\uff0c\u4f7f\u7528\u95ea\u5b58\u5f0f\u5b58\u50a8\u8bbe\u5907\u53ef\u6bd4\u4f20\u7edf\u786c\u76d8\u901f\u5ea6\u9ad8\u51fa6\uff0d10\u500d\u5de6\u53f3\u3002b) CPU \u5bf9\u4e8eMySQL\u5e94\u7528\uff0c\u63a8\u8350\u4f7f\u7528S.M.P.\u67b6\u6784\u7684\u591a\u8def\u5bf9\u79f0CPU\uff0c\u4f8b\u5982\uff1a\u53ef\u4ee5\u4f7f\u7528\u4e24\u9897Intel Xeon 3.6GHz\u7684CPU\u3002
\nc) \u7269\u7406\u5185\u5b58\u5bf9\u4e8e\u4e00\u53f0\u4f7f\u7528MySQL\u7684Database Server\u6765\u8bf4\uff0c\u670d\u52a1\u5668\u5185\u5b58\u5efa\u8bae\u4e0d\u8981\u5c0f\u4e8e2GB\uff0c\u63a8\u8350\u4f7f\u75284GB\u4ee5\u4e0a\u7684\u7269\u7406\u5185\u5b58\u3002<\/p>\n
\u4e8c\u3001\u8f6f\u4ef6\u4f18\u5316\u2014\u2014MySQL\u81ea\u8eab(my.cnf)\u7684\u4f18\u5316<\/p>\n
MySQL\u81ea\u8eab\u56e0\u7d20<\/p>\n
\u5f53\u89e3\u51b3\u4e86\u4e0a\u8ff0\u670d\u52a1\u5668\u786c\u4ef6\u5236\u7ea6\u56e0\u7d20\u540e\uff0c\u8ba9\u6211\u4eec\u770b\u770bMySQL\u81ea\u8eab\u7684\u4f18\u5316\u662f\u5982\u4f55\u64cd\u4f5c\u7684\u3002\u5bf9MySQL\u81ea\u8eab\u7684\u4f18\u5316\u4e3b\u8981\u662f\u5bf9\u5176\u914d\u7f6e\u6587\u4ef6my.cnf\u4e2d\u7684\u5404\u9879\u53c2\u6570\u8fdb\u884c\u4f18\u5316\u8c03\u6574\u3002\u4e0b\u9762\u6211\u4eec\u4ecb\u7ecd\u4e00\u4e9b\u5bf9\u6027\u80fd\u5f71\u54cd\u8f83\u5927\u7684\u53c2\u6570\u3002
\n\u7531\u4e8emy.cnf\u6587\u4ef6\u7684\u4f18\u5316\u8bbe\u7f6e\u662f\u4e0e\u670d\u52a1\u5668\u786c\u4ef6\u914d\u7f6e\u606f\u606f\u76f8\u5173\u7684\uff0c\u56e0\u800c\u6211\u4eec\u6307\u5b9a\u4e00\u4e2a\u5047\u60f3\u7684\u670d\u52a1\u5668\u786c\u4ef6\u73af\u5883\uff1a
\nCPU: 2\u9897Intel Xeon 2.4GHz
\n\u5185\u5b58: 4GB DDR
\n\u786c\u76d8: SCSI 73GB<\/p>\n
\u4e0b\u9762\uff0c\u6211\u4eec\u6839\u636e\u4ee5\u4e0a\u786c\u4ef6\u914d\u7f6e\u7ed3\u5408\u4e00\u4efd\u5df2\u7ecf\u4f18\u5316\u597d\u7684my.cnf\u8fdb\u884c\u8bf4\u660e\uff1a
\n# vi \/etc\/my.cnf
\n\u4ee5\u4e0b\u53ea\u5217\u51famy.cnf\u6587\u4ef6\u4e2d[mysqld]\u6bb5\u843d\u4e2d\u7684\u5185\u5bb9\uff0c\u5176\u4ed6\u6bb5\u843d\u5185\u5bb9\u5bf9MySQL\u8fd0\u884c\u6027\u80fd\u5f71\u54cd\u751a\u5fae\uff0c\u56e0\u800c\u59d1\u4e14\u5ffd\u7565\u3002<\/p>\n
\r\n[mysqld]\r\nport = 3306\r\nserverid = 1\r\nsocket = \/tmp\/mysql.sock\r\nskip-locking # \u907f\u514dMySQL\u7684\u5916\u90e8\u9501\u5b9a\uff0c\u51cf\u5c11\u51fa\u9519\u51e0\u7387\u589e\u5f3a\u7a33\u5b9a\u6027\u3002\r\nskip-name-resolve #\u7981\u6b62MySQL\u5bf9\u5916\u90e8\u8fde\u63a5\u8fdb\u884cDNS\u89e3\u6790\uff0c\u4f7f\u7528\u8fd9\u4e00\u9009\u9879\u53ef\u4ee5\u6d88\u9664MySQL\u8fdb\u884cDNS\u89e3\u6790\u7684\u65f6\u95f4\u3002\u4f46\u9700\u8981\u6ce8\u610f\uff0c\u5982\u679c\u5f00\u542f\u8be5\u9009\u9879\uff0c\u5219\u6240\u6709\u8fdc\u7a0b\u4e3b\u673a\u8fde\u63a5\u6388\u6743\u90fd\u8981\u4f7f\u7528IP\u5730\u5740\u65b9\u5f0f\uff0c\u5426\u5219MySQL\u5c06\u65e0\u6cd5\u6b63\u5e38\u5904\u7406\u8fde\u63a5\u8bf7\u6c42\uff01\r\nback_log = 384 #\u6307\u5b9aMySQL\u53ef\u80fd\u7684\u8fde\u63a5\u6570\u91cf\u3002\u5f53MySQL\u4e3b\u7ebf\u7a0b\u5728\u5f88\u77ed\u7684\u65f6\u95f4\u5185\u63a5\u6536\u5230\u975e\u5e38\u591a\u7684\u8fde\u63a5\u8bf7\u6c42\uff0c\u8be5\u53c2\u6570\u751f\u6548\uff0c\u4e3b\u7ebf\u7a0b\u82b1\u8d39\u5f88\u77ed\u7684\u65f6\u95f4\u68c0\u67e5\u8fde\u63a5\u5e76\u4e14\u542f\u52a8\u4e00\u4e2a\u65b0\u7ebf\u7a0b\u3002\r\nback_log #\u53c2\u6570\u7684\u503c\u6307\u51fa\u5728MySQL\u6682\u65f6\u505c\u6b62\u54cd\u5e94\u65b0\u8bf7\u6c42\u4e4b\u524d\u7684\u77ed\u65f6\u95f4\u5185\u591a\u5c11\u4e2a\u8bf7\u6c42\u53ef\u4ee5\u88ab\u5b58\u5728\u5806\u6808\u4e2d\u3002 \u5982\u679c\u7cfb\u7edf\u5728\u4e00\u4e2a\u77ed\u65f6\u95f4\u5185\u6709\u5f88\u591a\u8fde\u63a5\uff0c\u5219\u9700\u8981\u589e\u5927\u8be5\u53c2\u6570\u7684\u503c\uff0c\u8be5\u53c2\u6570\u503c\u6307\u5b9a\u5230\u6765\u7684TCP\/IP\u8fde\u63a5\u7684\u4fa6\u542c\u961f\u5217\u7684\u5927\u5c0f\u3002\u4e0d\u540c\u7684\u64cd\u4f5c\u7cfb\u7edf\u5728\u8fd9\u4e2a\u961f\u5217\u5927\u5c0f\u4e0a\u6709\u5b83\u81ea\u5df1\u7684\u9650\u5236\u3002 \u8bd5\u56fe\u8bbe\u5b9aback_log\u9ad8\u4e8e\u4f60\u7684\u64cd\u4f5c\u7cfb\u7edf\u7684\u9650\u5236\u5c06\u662f\u65e0\u6548\u7684\u3002\u9ed8\u8ba4\u503c\u4e3a50\u3002\u5bf9\u4e8eLinux\u7cfb\u7edf\u63a8\u8350\u8bbe\u7f6e\u4e3a\u5c0f\u4e8e512\u7684\u6574\u6570\u3002\r\nkey_buffer_size = 256M # key_buffer_size\u6307\u5b9a\u7528\u4e8e\u7d22\u5f15\u7684\u7f13\u51b2\u533a\u5927\u5c0f\uff0c\u589e\u52a0\u5b83\u53ef\u5f97\u5230\u66f4\u597d\u7684\u7d22\u5f15\u5904\u7406\u6027\u80fd\u3002\u5bf9\u4e8e\u5185\u5b58\u57284GB\u5de6\u53f3\u7684\u670d\u52a1\u5668\u8be5\u53c2\u6570\u53ef\u8bbe\u7f6e\u4e3a256M\u6216384M\u3002 \u6ce8\u610f\uff1a\u8be5\u53c2\u6570\u503c\u8bbe\u7f6e\u7684\u8fc7\u5927\u53cd\u800c\u4f1a\u662f\u670d\u52a1\u5668\u6574\u4f53\u6548\u7387\u964d\u4f4e\uff01\r\nmax_allowed_packet = 4M\r\nthread_stack = 256K\r\ntable_cache = 128K\r\nsort_buffer_size = 6M #\u67e5\u8be2\u6392\u5e8f\u65f6\u6240\u80fd\u4f7f\u7528\u7684\u7f13\u51b2\u533a\u5927\u5c0f\u3002\u6ce8\u610f\uff1a\u8be5\u53c2\u6570\u5bf9\u5e94\u7684\u5206\u914d\u5185\u5b58\u662f\u6bcf\u8fde\u63a5\u72ec\u5360\uff01\u5982\u679c\u6709100\u4e2a\u8fde\u63a5\uff0c\u90a3\u4e48\u5b9e\u9645\u5206\u914d\u7684\u603b\u5171\u6392\u5e8f\u7f13\u51b2\u533a\u5927\u5c0f\u4e3a100 \u00d7 6 \uff1d 600MB\u3002\u6240\u4ee5\uff0c\u5bf9\u4e8e\u5185\u5b58\u57284GB\u5de6\u53f3\u7684\u670d\u52a1\u5668\u63a8\u8350\u8bbe\u7f6e\u4e3a6-8M\u3002\r\nread_buffer_size = 4M #\u8bfb\u67e5\u8be2\u64cd\u4f5c\u6240\u80fd\u4f7f\u7528\u7684\u7f13\u51b2\u533a\u5927\u5c0f\u3002\u548csort_buffer_size\u4e00\u6837\uff0c\u8be5\u53c2\u6570\u5bf9\u5e94\u7684\u5206\u914d\u5185\u5b58\u4e5f\u662f\u6bcf\u8fde\u63a5\u72ec\u4eab\uff01 join_buffer_size = 8M #\u8054\u5408\u67e5\u8be2\u64cd\u4f5c\u6240\u80fd\u4f7f\u7528\u7684\u7f13\u51b2\u533a\u5927\u5c0f\uff0c\u548csort_buffer_size\u4e00\u6837\uff0c\u8be5\u53c2\u6570\u5bf9\u5e94\u7684\u5206\u914d\u5185\u5b58\u4e5f\u662f\u6bcf\u8fde\u63a5\u72ec\u4eab\uff01 myisam_sort_buffer_size = 64M\r\ntable_cache = 512\r\nthread_cache_size = 64\r\nquery_cache_size = 64M #\u6307\u5b9aMySQL\u67e5\u8be2\u7f13\u51b2\u533a\u7684\u5927\u5c0f\u3002\r\n\r\n\u53ef\u4ee5\u901a\u8fc7\u5728MySQL\u63a7\u5236\u53f0\u6267\u884c\u4ee5\u4e0b\u547d\u4ee4\u89c2\u5bdf\uff1a\r\n\r\n# > SHOW VARIABLES LIKE \u2018%query_cache%\u2019;\r\n# > SHOW STATUS LIKE \u2018Qcache%\u2019;\r\n\r\n# \u5982\u679cQcache_lowmem_prunes\u7684\u503c\u975e\u5e38\u5927\uff0c\u5219\u8868\u660e\u7ecf\u5e38\u51fa\u73b0\u7f13\u51b2\u4e0d\u591f\u7684\u60c5\u51b5\uff1b\r\n#\u5982\u679cQcache_hits\u7684\u503c\u975e\u5e38\u5927\uff0c\u5219\u8868\u660e\u67e5\u8be2\u7f13\u51b2\u4f7f\u7528\u975e\u5e38\u9891\u7e41\uff0c\u5982\u679c\u8be5\u503c\u8f83\u5c0f\u53cd\u800c\u4f1a\u5f71\u54cd\u6548\u7387\uff0c\u90a3\u4e48\u53ef\u4ee5\u8003\u8651\u4e0d\u7528\u67e5\u8be2\u7f13\u51b2\uff1b #Qcache_free_blocks\uff0c\u5982\u679c\u8be5\u503c\u975e\u5e38\u5927\uff0c\u5219\u8868\u660e\u7f13\u51b2\u533a\u4e2d\u788e\u7247\u5f88\u591a\u3002\r\ntmp_table_size = 256M\r\nmax_connections = 768 #\u6307\u5b9aMySQL\u5141\u8bb8\u7684\u6700\u5927\u8fde\u63a5\u8fdb\u7a0b\u6570\u3002\u5982\u679c\u5728\u8bbf\u95ee\u8bba\u575b\u65f6\u7ecf\u5e38\u51fa\u73b0Too Many Connections\u7684\u9519\u8bef\u63d0 \u793a\uff0c\u5219\u9700\u8981\u589e\u5927\u8be5\u53c2\u6570\u503c\u3002\r\nmax_connect_errors = 10000000\r\nwait_timeout = 10 #\u6307\u5b9a\u4e00\u4e2a\u8bf7\u6c42\u7684\u6700\u5927\u8fde\u63a5\u65f6\u95f4\uff0c\u5bf9\u4e8e4GB\u5de6\u53f3\u5185\u5b58\u7684\u670d\u52a1\u5668\u53ef\u4ee5\u8bbe\u7f6e\u4e3a5-10\u3002\r\nthread_concurrency = 8 #\u8be5\u53c2\u6570\u53d6\u503c\u4e3a\u670d\u52a1\u5668\u903b\u8f91CPU\u6570\u91cf\u00d72\uff0c\u5728\u672c\u4f8b\u4e2d\uff0c\u670d\u52a1\u5668\u67092\u9897\u7269\u7406CPU\uff0c\u800c\u6bcf\u9897\u7269\u7406CPU\u53c8\u652f\u6301H.T\u8d85\u7ebf\u7a0b\uff0c\u6240\u4ee5\u5b9e\u9645\u53d6\u503c\u4e3a4 \u00d7 2 \uff1d 8\r\nskip-networking #\u5f00\u542f\u8be5\u9009\u9879\u53ef\u4ee5\u5f7b\u5e95\u5173\u95edMySQL\u7684TCP\/IP\u8fde\u63a5\u65b9\u5f0f\uff0c\u5982\u679cWEB\u670d\u52a1\u5668\u662f\u4ee5\u8fdc\u7a0b\u8fde\u63a5\u7684\u65b9\u5f0f\u8bbf\u95eeMySQL\u6570\u636e\u5e93\u670d\u52a1\u5668\u5219\u4e0d\u8981\u5f00\u542f\u8be5\u9009\u9879\uff01\u5426\u5219\u5c06\u65e0\u6cd5\u6b63\u5e38\u8fde\u63a5\uff01\r\n<\/pre>\n\u4e09\u3001\u6570\u636e\u5e93\u7684\u8bbe\u8ba1\u548c\u6570\u636e\u4fe1\u606f\u7684\u4f18\u5316<\/p>\n
\u8868\u8bbe\u8ba1\u65b9\u9762<\/p>\n
1\u3001\u9009\u53d6\u6700\u9002\u7528\u7684\u5b57\u6bb5\u5c5e\u6027<\/p>\n
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\u4e3aCHAR(255),\u663e\u7136\u7ed9\u6570\u636e\u5e93\u589e\u52a0\u4e86\u4e0d\u5fc5\u8981\u7684\u7a7a\u95f4\uff0c\u751a\u81f3\u4f7f\u7528VARCHAR\u8fd9\u79cd\u7c7b\u578b\u4e5f\u662f\u591a\u4f59\u7684\uff0c\u56e0\u4e3aCHAR(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\u7528MEDIUMINT\u800c\u4e0d\u662fBIGIN\u6765\u5b9a\u4e49\u6574\u578b\u5b57\u6bb5\u3002<\/p>\n
2\u3001\u5728\u53ef\u80fd\u7684\u60c5\u51b5\u4e0b\uff0c\u5e94\u8be5\u5c3d\u91cf\u628a\u5b57\u6bb5\u8bbe\u7f6e\u4e3aNOT NULL\uff0c\u8fd9\u6837\u5728\u5c06\u6765\u6267\u884c\u67e5\u8be2\u7684\u65f6\u5019\uff0c\u6570\u636e\u5e93\u4e0d\u7528\u53bb\u6bd4\u8f83NULL\u503c\u3002<\/p>\n
3\u3001\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\u4e3aENUM\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<\/p>\n
4\u3001\u4f7f\u7528\u5c3d\u91cf\u5c0f\u7684\u6570\u636e\u7c7b\u578b\uff0c\u4f8b\u5982\uff1aMEDIUMINT\u6bd4INT\u5c11\u5360\u752825%\u7a7a\u95f4\u3002<\/p>\n
5\u3001\u7528\u4e8e\u6bd4\u8f83\u7684\u4e0d\u540c\u5b57\u6bb5\uff0c\u5e94\u8bbe\u7f6e\u76f8\u540c\u7684\u7c7b\u578b\u53ca\u957f\u5ea6\u3002<\/p>\n
6\u3001\u4f7f\u7528\u7d22\u5f15\uff0c\u4e3b\u7d22\u5f15\u5c3d\u53ef\u80fd\u77ed,\u4ec5\u521b\u5efa\u771f\u6b63\u7528\u5230\u7684\u7d22\u5f15\uff08\u7d22\u5f15\u4f1a\u51cf\u6162\u5b58\u50a8\u6570\u636e\u7684\u901f\u5ea6\uff09\u3002<\/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\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\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\u7528ALTER TABLE\u6216CREATE INDEX\u5728\u4ee5\u540e\u521b\u5efa\u7d22\u5f15\u3002<\/p>\n
\u6b64\u5916\uff0cMySQL\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
7\u3001\u5982\u679c\u4e00\u4e2a\u5b57\u7b26\u4e32\u7c7b\u578b\u5b57\u6bb5\u6709\u552f\u4e00\u524d\u7f00\uff0c\u53ef\u4ee5\u4f7f\u7528\u8fd9\u4e2a\u524d\u7f00\u4f5c\u4e3a\u7d22\u5f15\u3002\u5982\u524d\u7f00\u4e3a1\u4e2a\u5b57\u7b26\uff0c\u5219\u53ef\u4ee5\u8fd9\u6837\u8bbe\u7f6e\u7d22\u5f15 INDEX( text( 1 ) )\u3002<\/p>\n
8\u3001\u53ef\u4ee5\u628a\u7ecf\u5e38\u626b\u63cf\u7684\u8868\u62c6\u5206\u3002<\/p>\n
9\u3001\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\u5230 salesinfo\u4e2d\u3002<\/p>\n
\r\nCREATE TABLE customerinfo\u3000\u3000(\r\nCustomerID INT NOT NULL ,\r\nPRIMARY KEY ( CustomerID )\r\n) TYPE = INNODB;\r\nCREATE TABLE salesinfo\u3000\u3000(\r\nSalesID INT NOT NULL,\r\nCustomerID INT NOT NULL,\r\nPRIMARY KEY(CustomerID, SalesID),\r\nFOREIGN KEY (CustomerID) REFERENCES customerinfo\r\n(CustomerID) ON DELETECASCADE\r\n) TYPE = INNODB;\r\n<\/pre>\n\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\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
\u67e5\u8be2\u65b9\u9762\uff1a<\/p>\n
1\u3001\u4f7f\u7528\u8fde\u63a5\uff08JOIN\uff09\u6765\u4ee3\u66ff\u5b50\u67e5\u8be2(Sub-Queries)<\/p>\n
MySQL\u4ece4.1\u5f00\u59cb\u652f\u6301SQL\u7684\u5b50\u67e5\u8be2\u3002\u8fd9\u4e2a\u6280\u672f\u53ef\u4ee5\u4f7f\u7528SELECT\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<\/p>\n
\r\nDELETE FROM customerinfo WHERE CustomerID NOT in (SELECT CustomerID FROM salesinfo )\r\n<\/pre>\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<\/p>\n
\r\nSELECT * FROM customerinfo WHERE CustomerID NOT in (SELECT CustomerID FROM salesinfo )\r\n<\/pre>\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<\/p>\n
\r\nSELECT * FROM customerinfo LEFT JOIN salesinfoON customerinfo.CustomerID=salesinfo. CustomerID WHERE salesinfo.CustomerID IS NULL\r\n<\/pre>\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<\/p>\n
2\u3001\u4f7f\u7528\u8054\u5408(UNION)\u6765\u4ee3\u66ff\u624b\u52a8\u521b\u5efa\u7684\u4e34\u65f6\u8868<\/p>\n
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\u3002<\/p>\n
\r\nSELECT Name, Phone FROM client UNION SELECT Name, BirthDate FROM author\u3000\u3000UNION\u3000\u3000SELECT Name, Supplier FROM product\r\n<\/pre>\n3\u3001\u4e8b\u52a1<\/p>\n
\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\u4ee5BEGIN \u5173\u952e\u5b57\u5f00\u59cb\uff0cCOMMIT\u5173\u952e\u5b57\u7ed3\u675f\u3002\u5728\u8fd9\u4e4b\u95f4\u7684\u4e00\u6761SQL\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\u3002<\/p>\n
\r\nBEGIN;\r\nINSERT INTO salesinfo SET CustomerID=14;\r\nUPDATE inventory SET Quantity=11\u3000\u3000WHERE item=\u2019book\u2019;\r\nCOMMIT;\r\n<\/pre>\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<\/p>\n
4\u3001\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\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<\/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
\r\nLOCK TABLE inventory WRITE\r\nSELECT Quantity FROM inventory\r\nWHEREItem=\u2019book\u2019;\r\n\u2026\r\nUPDATE inventory SET Quantity=11\r\nWHEREItem=\u2019book\u2019;\r\nUNLOCK TABLES\r\n<\/pre>\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<\/p>\n
5\u3001\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\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\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<\/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
\r\nSELECT * FROM order WHERE YEAR(OrderDate)<2001;\r\n\r\nSELECT * FROM order WHERE OrderDate<"2001-01-01";\r\n<\/pre>\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<\/p>\n
\r\nSELECT * FROM inventory WHERE Amount\/7<24;\r\n\r\nSELECT * FROM inventory WHERE Amount<24*7;\r\n<\/pre>\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\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
\r\nSELECT * FROM books\r\nWHERE name like "MySQL%"\r\n<\/pre>\n\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
\r\nSELECT * FROM books\r\nWHERE name>="MySQL"and name<"MySQM"\r\n<\/pre>\n\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
\u5176\u4ed6\u65b9\u9762\uff1a<\/p>\n
1\u3001\u6e05\u7a7a\u8868\u4f7f\u7528TRUNCATE TABLE tablename \u6bd4 DELETE FROM tablename \u5feb\u3002<\/p>\n
2\u3001INSERT\u65f6\uff0c\u53ea\u6709\u5728\u8981\u63d2\u5165\u6570\u503c\u4e0e\u9ed8\u8ba4\u6570\u503c\u4e0d\u540c\u65f6\u624d\u6267\u884c\u63d2\u5165\u64cd\u4f5c\u3002<\/p>\n
3\u3001\u4e00\u6b21\u63d2\u5165\u591a\u884c\u65f6\uff0c\u5c3d\u91cf\u4f7f\u7528\u591a\u4e2aVALUES\u5217\u8868\u7684INSERT\u8bed\u53e5\u3002<\/p>\n
4\u3001\u4ece\u8868\u4e2d\u5220\u9664\u5927\u91cf\u884c\u540e\uff0c\u8fd0\u884cOPTIMIZE TABLE tablename \u8fdb\u884c\u788e\u7247\u6574\u7406\u3002<\/p>\n
5\u3001\u4f7f\u7528ANALYZE TABLE tablename \u66f4\u65b0\u7d22\u5f15\u5206\u5e03\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5728Apache, PHP, MySQL\u7684\u4f53\u7cfb\u67b6\u6784\u4e2d\uff0cMySQL\u5bf9\u4e8e\u6027\u80fd\u7684\u5f71\u54cd\u6700\u5927\uff0c\u4e5f\u662f\u5173\u952e\u7684\u6838\u5fc3\u90e8\u5206\u3002MySQ […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-405","post","type-post","status-publish","format-standard","hentry","category-code_related"],"_links":{"self":[{"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/posts\/405","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/comments?post=405"}],"version-history":[{"count":1,"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/posts\/405\/revisions"}],"predecessor-version":[{"id":5289,"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/posts\/405\/revisions\/5289"}],"wp:attachment":[{"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/media?parent=405"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/categories?post=405"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/tags?post=405"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}