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name!=\u2019shenjian\u2019\uff0c\u5982\u679c\u5b58\u5728name\u4e3anull\u503c\u7684\u8bb0\u5f55\uff0c\u67e5\u8be2\u7ed3\u679c\u5c31\u4e0d\u4f1a\u5305\u542bname\u4e3anull\u503c\u7684\u8bb0\u5f55<\/code><\/p>\n\n\n\n\u89e3\u8bfb\uff1a\u4f1a\u6d6a\u8d39\u66f4\u591a\u7684\u78c1\u76d8\u548c\u5185\u5b58\u7a7a\u95f4\uff0c\u975e\u5fc5\u8981\u7684\u5927\u91cf\u7684\u5927\u5b57\u6bb5\u67e5\u8be2\u4f1a\u6dd8\u6c70\u6389\u70ed\u6570\u636e\uff0c\u5bfc\u81f4\u5185\u5b58\u547d\u4e2d\u7387\u6025\u5267\u964d\u4f4e\uff0c\u5f71\u54cd\u6570\u636e\u5e93\u6027\u80fd<\/code><\/p>\n\n\n\n\u89e3\u8bfb\uff1a\u4f7f\u7528\u6574\u6570\u5427\uff0c\u5c0f\u6570\u5bb9\u6613\u5bfc\u81f4\u94b1\u5bf9\u4e0d\u4e0a<\/code><\/p>\n\n\n\n\u89e3\u8bfb\uff1a<\/code><\/p>\n\n\n\na\uff09\u6d89\u53ca\u5230\u533a\u53f7\u6216\u8005\u56fd\u5bb6\u4ee3\u53f7\uff0c\u53ef\u80fd\u51fa\u73b0+-()<\/code><\/p>\n\n\n\nb\uff09\u624b\u673a\u53f7\u4f1a\u53bb\u505a\u6570\u5b66\u8fd0\u7b97\u4e48\uff1f<\/code><\/p>\n\n\n\nc\uff09varchar\u53ef\u4ee5\u652f\u6301\u6a21\u7cca\u67e5\u8be2\uff0c\u4f8b\u5982\uff1alike\u201c138%\u201d<\/code><\/p>\n\n\n\na\uff09\u589e\u52a0\u65b0\u7684ENUM\u503c\u8981\u505aDDL\u64cd\u4f5c<\/code><\/p>\n\n\n\nb\uff09ENUM\u7684\u5185\u90e8\u5b9e\u9645\u5b58\u50a8\u5c31\u662f\u6574\u6570\uff0c\u4f60\u4ee5\u4e3a\u81ea\u5df1\u5b9a\u4e49\u7684\u662f\u5b57\u7b26\u4e32\uff1f<\/code><\/p>\n\n\n\n**\uff0819\uff09\u5355\u8868\u7d22\u5f15\u5efa\u8bae\u63a7\u5236\u57285\u4e2a\u4ee5\u5185**<\/code><\/p>\n\n\n\n**\uff0820\uff09\u5355\u7d22\u5f15\u5b57\u6bb5\u6570\u4e0d\u5141\u8bb8\u8d85\u8fc75\u4e2a**<\/code><\/p>\n\n\n\n\u89e3\u8bfb\uff1a\u5b57\u6bb5\u8d85\u8fc75\u4e2a\u65f6\uff0c\u5b9e\u9645\u5df2\u7ecf\u8d77\u4e0d\u5230\u6709\u6548\u8fc7\u6ee4\u6570\u636e\u7684\u4f5c\u7528\u4e86<\/code><\/p>\n\n\n\n\u89e3\u8bfb\uff1a<\/code><\/p>\n\n\n\na\uff09\u66f4\u65b0\u4f1a\u53d8\u66f4B+\u6811\uff0c\u66f4\u65b0\u9891\u7e41\u7684\u5b57\u6bb5\u5efa\u7acb\u7d22\u5f15\u4f1a\u5927\u5927\u964d\u4f4e\u6570\u636e\u5e93\u6027\u80fd<\/code><\/p>\n\n\n\nb\uff09\u201c\u6027\u522b\u201d\u8fd9\u79cd\u533a\u5206\u5ea6\u4e0d\u5927\u7684\u5c5e\u6027\uff0c\u5efa\u7acb\u7d22\u5f15\u662f\u6ca1\u6709\u4ec0\u4e48\u610f\u4e49\u7684\uff0c\u4e0d\u80fd\u6709\u6548\u8fc7\u6ee4\u6570\u636e\uff0c\u6027\u80fd\u4e0e\u5168\u8868\u626b\u63cf\u7c7b\u4f3c<\/code><\/p>\n\n\n\n\u89e3\u8bfb\uff1a\u80fd\u591f\u66f4\u52a0\u6709\u6548\u7684\u8fc7\u6ee4\u6570\u636e<\/code><\/p>\n\n\n\n**\uff0823\uff09\u7981\u6b62\u4f7f\u7528SELECT *\uff0c\u53ea\u83b7\u53d6\u5fc5\u8981\u7684\u5b57\u6bb5\uff0c\u9700\u8981\u663e\u793a\u8bf4\u660e\u5217\u5c5e\u6027**<\/code><\/p>\n\n\n\n\u89e3\u8bfb\uff1a<\/code><\/p>\n\n\n\na\uff09\u8bfb\u53d6\u4e0d\u9700\u8981\u7684\u5217\u4f1a\u589e\u52a0CPU\u3001IO\u3001NET\u6d88\u8017<\/code><\/p>\n\n\n\nb\uff09\u4e0d\u80fd\u6709\u6548\u7684\u5229\u7528\u8986\u76d6\u7d22\u5f15<\/code><\/p>\n\n\n\nc\uff09\u4f7f\u7528SELECT *\u5bb9\u6613\u5728\u589e\u52a0\u6216\u8005\u5220\u9664\u5b57\u6bb5\u540e\u51fa\u73b0\u7a0b\u5e8fBUG<\/code><\/p>\n\n\n\n\u89e3\u8bfb\uff1a\u5bb9\u6613\u5728\u589e\u52a0\u6216\u8005\u5220\u9664\u5b57\u6bb5\u540e\u51fa\u73b0\u7a0b\u5e8fBUG<\/code><\/p>\n\n\n\n\u89e3\u8bfb\uff1aSELECT uid FROM t_user WHERE phone=13812345678 \u4f1a\u5bfc\u81f4\u5168\u8868\u626b\u63cf\uff0c\u800c\u4e0d\u80fd\u547d\u4e2dphone\u7d22\u5f15\uff0c\u731c\u731c\u4e3a\u4ec0\u4e48\uff1f\uff08\u8fd9\u4e2a\u7ebf\u4e0a\u95ee\u9898\u4e0d\u6b62\u51fa\u73b0\u8fc7\u4e00\u6b21\uff09<\/code><\/p>\n\n\n\n\u89e3\u8bfb\uff1aSELECT uid FROM t_user WHERE from_unixtime(day)>='2017-02-15' \u4f1a\u5bfc\u81f4\u5168\u8868\u626b\u63cf<\/code><\/p>\n\n\n\n\u6b63\u786e\u7684\u5199\u6cd5\u662f\uff1aSELECT uid FROM t_user WHERE day>= unix_timestamp('2017-02-15 00:00:00')<\/code><\/p>\n\n\n\n\u89e3\u8bfb\uff1a<\/code><\/p>\n\n\n\na\uff09\u8d1f\u5411\u67e5\u8be2\u6761\u4ef6\uff1aNOT\u3001!=\u3001<>\u3001!<\u3001!>\u3001NOT IN\u3001NOT LIKE\u7b49\uff0c\u4f1a\u5bfc\u81f4\u5168\u8868\u626b\u63cf<\/code><\/p>\n\n\n\nb\uff09%\u5f00\u5934\u7684\u6a21\u7cca\u67e5\u8be2\uff0c\u4f1a\u5bfc\u81f4\u5168\u8868\u626b\u63cf<\/code><\/p>\n\n\n\n\u89e3\u8bfb\uff1a\u4f1a\u4ea7\u751f\u4e34\u65f6\u8868\uff0c\u6d88\u8017\u8f83\u591a\u5185\u5b58\u4e0eCPU\uff0c\u6781\u5927\u5f71\u54cd\u6570\u636e\u5e93\u6027\u80fd<\/code><\/p>\n\n\n\n\u89e3\u8bfb\uff1a\u65e7\u7248\u672cMysql\u7684OR\u67e5\u8be2\u662f\u4e0d\u80fd\u547d\u4e2d\u7d22\u5f15\u7684\uff0c\u5373\u4f7f\u80fd\u547d\u4e2d\u7d22\u5f15\uff0c\u4e3a\u4f55\u8981\u8ba9\u6570\u636e\u5e93\u8017\u8d39\u66f4\u591a\u7684CPU\u5e2e\u52a9\u5b9e\u65bd\u67e5\u8be2\u4f18\u5316\u5462\uff1f<\/code><\/p>\n\n\n\n\u603b\u7ed3\uff1a\u5927\u6570\u636e\u91cf\u9ad8\u5e76\u53d1\u7684\u4e92\u8054\u7f51\u4e1a\u52a1\uff0c\u6781\u5927\u5f71\u54cd\u6570\u636e\u5e93\u6027\u80fd\u7684\u90fd\u4e0d\u8ba9\u7528\uff0c\u4e0d\u8ba9\u7528\u54df\u3002<\/code><\/p>\n","protected":false},"excerpt":{"rendered":"