{"id":31624,"date":"2023-05-25T11:22:38","date_gmt":"2023-05-25T03:22:38","guid":{"rendered":"https:\/\/docs.pingcode.com\/?p=31624"},"modified":"2023-07-31T00:09:36","modified_gmt":"2023-07-30T16:09:36","slug":"mysql%e7%b4%a2%e5%bc%95%e5%a4%b1%e6%95%88%e5%8e%9f%e7%90%86%e6%98%af%e4%bb%80%e4%b9%88","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/31624.html","title":{"rendered":"MySQL\u7d22\u5f15\u5931\u6548\u539f\u7406\u662f\u4ec0\u4e48"},"content":{"rendered":"<blockquote class=\"wp-block-quote\">\n<p>\u7d22\u5f15\u5931\u6548\u95ee\u9898\u662f\u9762\u8bd5\u5fc5\u95ee\u95ee\u9898\uff0c\u56e0\u4e3a\u7d22\u5f15\u5931\u6548\u7684\u60c5\u51b5\u6bd4\u8f83\u591a\uff0c\u5f88\u591a\u540c\u5b66\u8bb0\u4e0d\u4f4f\uff0c\u9762\u8bd5\u7684\u65f6\u5019\u56de\u7b54\u4e0d\u597d\u3002\u6211\u4ed4\u7ec6\u7814\u7a76\u4e86\u4e03\u4e03\u56db\u5341\u4e03\u5929\uff0c\u8bbe\u8ba1\u4e86\u4e00\u53e5\u4e03\u5b57\u53e3\u8bc0\uff0c\u8bb0\u4f4f\u8fd9\u53e5\u53e3\u8bc0\uff0c\u4ee5\u540e\u518d\u9047\u5230\u8fd9\u4e2a\u95ee\u9898\u5c31\u53ef\u4ee5\u62ff\u6ee1\u5206\u4e86\u3002<\/p>\n<\/blockquote>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img fetchpriority=\"high\" alt=\"\" class=\"wp-image-31625\" decoding=\"async\" height=\"421\" sizes=\"(max-width: 680px) 100vw, 680px\" src=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/05\/\u6dfb\u52a0\u6807\u9898-18-12.png?x-oss-process=image\/auto-orient,1\/format,webp\" srcset=\"https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/05\/\u6dfb\u52a0\u6807\u9898-18-12.png?x-oss-process=image\/auto-orient,1\/format,webp 680w, https:\/\/cdn-docs.pingcode.com\/wp-content\/uploads\/2023\/05\/\u6dfb\u52a0\u6807\u9898-18-12-300x186.png 300w\" width=\"680\"\/><\/figure>\n<\/div>\n<h2 class=\"wp-block-heading\"><strong>\u4e00\u3001MySQL\u7d22\u5f15\u5931\u6548\u539f\u7406<\/strong><\/h2>\n<p>\u7d22\u5f15\u5931\u6548\u95ee\u9898\u662f\u9762\u8bd5\u5fc5\u95ee\u95ee\u9898\uff0c\u56e0\u4e3a\u7d22\u5f15\u5931\u6548\u7684\u60c5\u51b5\u6bd4\u8f83\u591a\uff0c\u5f88\u591a\u540c\u5b66\u8bb0\u4e0d\u4f4f\uff0c\u9762\u8bd5\u7684\u65f6\u5019\u56de\u7b54\u4e0d\u597d\u3002\u6211\u4ed4\u7ec6\u7814\u7a76\u4e86\u4e03\u4e03\u56db\u5341\u4e03\u5929\uff0c\u8bbe\u8ba1\u4e86\u4e00\u53e5\u4e03\u5b57\u53e3\u8bc0\uff0c\u8bb0\u4f4f\u8fd9\u53e5\u53e3\u8bc0\uff0c\u4ee5\u540e\u518d\u9047\u5230\u8fd9\u4e2a\u95ee\u9898\u5c31\u53ef\u4ee5\u62ff\u6ee1\u5206\u4e86\u3002<\/p>\n<p>\u4e03\u5b57\u53e3\u8bc0\u5c31\u662f\uff1a<\/p>\n<p><strong>\u6a21 \u578b \u6570 \u7a7a \u8fd0 \u6700 \u5feb<\/strong><\/p>\n<p>\u53e3\u8bc0\u5b57\u9762\u610f\u601d\u5c31\u662f\uff0c\u8981\u8fd0\u9001\u4e00\u4e2a\u4ea7\u54c1\u6a21\u578b\u7684\u8bdd\uff0c\u8981\u7528\u7a7a\u8fd0\uff0c\u4e0d\u8981\u7528\u9646\u8fd0\u548c\u6d77\u8fd0\uff0c\u6570\u7a7a\u8fd0\u975e\u5e38\u5feb\u3002\u53eb\u505a\uff1a\u6a21\u578b\u6570\u7a7a\u8fd0\u975e\u5e38\u5feb\u3002<\/p>\n<p>\u4e0b\u9762\u6211\u62c6\u5f00\u9010\u5b57\u8bb2\u89e3\u4e00\u4e0b\uff1a<\/p>\n<p><strong>\u6a21<\/strong>\uff1a\u6a21\u7cca\u67e5\u8be2\u7684\u610f\u601d\u3002like\u7684\u6a21\u7cca\u67e5\u8be2\u4ee5%\u5f00\u5934\uff0c\u7d22\u5f15\u5931\u6548\u3002\u6bd4\u5982\uff1a<\/p>\n<p>SELECT * FROM `user` WHERE `name` LIKE \u2018%\u8001\u733f\u2019;<\/p>\n<p><strong>\u578b<\/strong>\uff1a\u4ee3\u8868\u6570\u636e\u7c7b\u578b\u3002\u7c7b\u578b\u9519\u8bef\uff0c\u5982\u5b57\u6bb5\u7c7b\u578b\u4e3avarchar\uff0cwhere\u6761\u4ef6\u7528number\uff0c\u7d22\u5f15\u4e5f\u4f1a\u5931\u6548\u3002\u6bd4\u5982\uff1a<\/p>\n<p>SELECT * FROM `user` WHERE\u00a0height= 180;<\/p>\n<p>height\u4e3avarchar\u7c7b\u578b\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\u3002<\/p>\n<p><strong>\u6570<\/strong>\uff1a\u662f\u51fd\u6570\u7684\u610f\u601d\u3002\u5bf9\u7d22\u5f15\u7684\u5b57\u6bb5\u4f7f\u7528\u5185\u90e8\u51fd\u6570\uff0c\u7d22\u5f15\u4e5f\u4f1a\u5931\u6548\u3002\u8fd9\u79cd\u60c5\u51b5\u4e0b\u5e94\u8be5\u5efa\u7acb\u57fa\u4e8e\u51fd\u6570\u7684\u7d22\u5f15\u3002\u6bd4\u5982\uff1a<\/p>\n<p>SELECT * FROM `user` WHERE DATE(create_time) = \u20182020-09-03\u2019;<\/p>\n<p>create_time\u5b57\u6bb5\u8bbe\u7f6e\u7d22\u5f15\uff0c\u90a3\u5c31\u65e0\u6cd5\u4f7f\u7528\u51fd\u6570\uff0c\u5426\u5219\u7d22\u5f15\u5931\u6548\u3002<\/p>\n<p><strong>\u7a7a<\/strong>\uff1a\u662fNull\u7684\u610f\u601d\u3002\u7d22\u5f15\u4e0d\u5b58\u50a8\u7a7a\u503c\uff0c\u5982\u679c\u4e0d\u9650\u5236\u7d22\u5f15\u5217\u662fnot null\uff0c\u6570\u636e\u5e93\u4f1a\u8ba4\u4e3a\u7d22\u5f15\u5217\u6709\u53ef\u80fd\u5b58\u5728\u7a7a\u503c\uff0c\u6240\u4ee5\u4e0d\u4f1a\u6309\u7167\u7d22\u5f15\u8fdb\u884c\u8ba1\u7b97\u3002\u6bd4\u5982\uff1a<\/p>\n<p>SELECT * FROM `user` WHERE address IS NULL\u4e0d\u8d70\u7d22\u5f15\u3002<\/p>\n<p>SELECT * FROM `user` WHERE address IS NOT NULL;\u8d70\u7d22\u5f15\u3002<\/p>\n<p>\u5efa\u8bae\u5927\u5bb6\u8fd9\u8bbe\u8ba1\u5b57\u6bb5\u7684\u65f6\u5019\uff0c\u5982\u679c\u6ca1\u6709\u5fc5\u8981\u7684\u8981\u6c42\u5fc5\u987b\u4e3aNULL\uff0c\u90a3\u4e48\u8f83\u597d\u7ed9\u4e2a\u9ed8\u8ba4\u503c\u7a7a\u5b57\u7b26\u4e32\uff0c\u8fd9\u53ef\u4ee5\u89e3\u51b3\u5f88\u591a\u540e\u7eed\u7684\u9ebb\u70e6\uff08\u5207\u8bb0\uff09\u3002<\/p>\n<p><strong>\u8fd0<\/strong>\uff1a\u662f\u8fd0\u7b97\u7684\u610f\u601d\u3002\u5bf9\u7d22\u5f15\u5217\u8fdb\u884c\uff08+\uff0c-\uff0c*\uff0c\/\uff0c!, !=, &lt;&gt;\uff09\u7b49\u8fd0\u7b97\uff0c\u4f1a\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\u3002\u6bd4\u5982\uff1a<\/p>\n<p>SELECT * FROM `user` WHERE age \u2013 1 = 20;<\/p>\n<p><strong>\u6700<\/strong>\uff1a\u662f\u6700\u5de6\u539f\u5219\u3002\u5728\u590d\u5408\u7d22\u5f15\u4e2d\u7d22\u5f15\u5217\u7684\u987a\u5e8f\u81f3\u5173\u91cd\u8981\u3002\u5982\u679c\u4e0d\u662f\u6309\u7167\u7d22\u5f15\u7684\u6700\u5de6\u5217\u5f00\u59cb\u67e5\u627e\uff0c\u5219\u65e0\u6cd5\u4f7f\u7528\u7d22\u5f15\u3002<\/p>\n<p><strong>\u5feb<\/strong>\uff1a\u5168\u8868\u626b\u63cf\u66f4\u5feb\u7684\u610f\u601d\u3002\u5982\u679c\u6570\u636e\u5e93\u9884\u8ba1\u4f7f\u7528\u5168\u8868\u626b\u63cf\u8981\u6bd4\u4f7f\u7528\u7d22\u5f15\u5feb\uff0c\u5219\u4e0d\u4f7f\u7528\u7d22\u5f15\u3002<\/p>\n<p><strong>\u5ef6\u4f38\u9605\u8bfb\uff1a<\/strong><\/p>\n<h2 class=\"wp-block-heading\"><strong>\u4e8c\u3001\u53cc\u4e3b\u67b6\u6784\u5b9e\u73b0\u65b9\u6848<\/strong><\/h2>\n<p>1\u3001\u4e3b\u5907\u6a21\u5f0f\uff0c\u4e24\u53f0MySQL\u4e92\u4e3a\u4e3b\u4ece\uff0c\u5176\u4e2d\u4e00\u53f0\u4f5c\u4e3a\u4e3b\u8282\u70b9\u5bf9\u5916\u63d0\u4f9b\u670d\u52a1\uff0c\u53e6\u5916\u4e00\u53f0\u4f5c\u4e3a\u5907\u673a\u8282\u70b9(standby),\u5f53\u63d0\u4f9b\u670d\u52a1\u7684\u4e3b\u8282\u70b9\u53d1\u751f\u6545\u969c\u540e\uff0c\u5c06\u670d\u52a1\u8bf7\u6c42\u5feb\u901f\u5207\u6362\u5230\u5907\u7528\u8282\u70b9\uff0c\u539f\u4e3b\u8282\u70b9\u6545\u969c\u6062\u590d\u540e\u8f6c\u6362\u4e3a\u5907\u7528\u8282\u70b9(standby)\u3002<br \/>2\u3001\u4e3b\u4e3b\u6a21\u5f0f\uff0c\u4e24\u53f0MySQL\u4e92\u4e3a\u4e3b\u4ece\uff0c\u4e14\u4e24\u53f0MySQL\u5747\u4f5c\u4e3a\u4e3b\u8282\u70b9\u5bf9\u5916\u63d0\u4f9b\u670d\u52a1\uff0c\u5f53\u5176\u4e2d\u4e00\u53f0MySQL\u53d1\u751f\u6545\u969c\u540e\uff0c\u5c06\u6307\u5411\u8be5\u6545\u969c\u8282\u70b9\u7684\u8bf7\u6c42\u5feb\u901f\u5207\u6362\u5230\u53e6\u5916\u4e00\u53f0MySQL\uff0c\u539f\u6765\u6307\u5411\u975e\u6545\u969c\u8282\u70b9\u7684\u8bf7\u6c42\u4e0d\u53d7\u5f71\u54cd\u3002<br \/>\u5728\u4e3b\u4e3b\u6a21\u5f0f\u4e0b\uff0c\u4e24\u4e2a\u4e3b\u5e93\u90fd\u63d0\u4f9b\u8bfb\u5199\u670d\u52a1\uff0c\u5982\u679c\u5e94\u7528\u901a\u8fc7\u4e24\u4e2a\u4e3b\u5e93\u64cd\u4f5c\u76f8\u540c\u6570\u636e\uff0c\u5219\u4f1a\u53d1\u751f\u51b2\u7a81\u5bfc\u81f4\u6570\u636e\u8986\u76d6(\u4f7f\u7528\u8bed\u53e5\u6a21\u5f0f\u590d\u5236)\u6216\u590d\u5236\u5f02\u5e38(\u4f7f\u7528\u884c\u6a21\u5f0f\u590d\u5236)\uff0c\u56e0\u6b64\u9700\u8981\u5bf9\u8bfb\u5199\u670d\u52a1\u8fdb\u884c\u63a7\u5236\uff1a<br \/>1\u3001\u57fa\u4e8e\u81ea\u4e3b\u4e3b\u952e\u63a7\u5236\uff0c\u901a\u8fc7\u8bbe\u7f6e\u81ea\u589e\u5c5e\u6027auto_increment_offset\u548cauto_increment_increment\u6765\u63a7\u5236\u6bcf\u4e2a\u4e3b\u8282\u70b9\u751f\u4ea7\u4e0d\u540c\u7684\u81ea\u589e\u503c\uff0c\u5e76\u6839\u636e\u4e0d\u540c\u81ea\u589e\u503c\u8bbf\u95ee\u4e0d\u540c\u4e3b\u8282\u70b9\u3002<br 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\/>3\u3001\u4ee3\u7406\uff0c\u901a\u8fc7\u66f4\u65b0\u4ee3\u7406\u4e2d\u5b58\u653e\u7684\u8def\u7531\u4fe1\u606f\u6765\u6307\u5411\u65b0\u4e3b\u8282\u70b9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u7d22\u5f15\u5931\u6548\u95ee\u9898\u662f\u9762\u8bd5\u5fc5\u95ee\u95ee\u9898\uff0c\u56e0\u4e3a\u7d22\u5f15\u5931\u6548\u7684\u60c5\u51b5\u6bd4\u8f83\u591a\uff0c\u5f88\u591a\u540c\u5b66\u8bb0\u4e0d\u4f4f\uff0c\u9762\u8bd5\u7684\u65f6\u5019\u56de\u7b54\u4e0d\u597d\u3002\u6211\u4ed4\u7ec6\u7814\u7a76\u4e86\u4e03\u4e03\u56db\u5341 [&hellip;]","protected":false},"author":1,"featured_media":31625,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/31624"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=31624"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/31624\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/31625"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=31624"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=31624"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=31624"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}