{"id":195167,"date":"2024-11-13T12:46:19","date_gmt":"2024-11-13T04:46:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/195167\/"},"modified":"2024-11-13T12:46:20","modified_gmt":"2024-11-13T04:46:20","slug":"%e5%84%aa%e5%8c%96%e6%9f%a5%e8%a9%a2%e9%80%9f%e5%ba%a6%ef%bc%8c%e6%95%b8%e6%93%9a%e5%ba%ab%e7%b4%a2%e5%bc%95%e7%9a%84%e7%a5%9e%e5%a5%87%e6%95%88%e6%9e%9cwhere%e6%a2%9d%e4%bb%b6%e5%a6%82%e4%bd%95","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/195167\/","title":{"rendered":"\u512a\u5316\u67e5\u8a62\u901f\u5ea6\uff0c\u6578\u64da\u5eab\u7d22\u5f15\u7684\u795e\u5947\u6548\u679cwhere\u689d\u4ef6\u5982\u4f55\u767c\u63ee\u5176\u4f5c\u7528 (\u6578\u64da\u5eab\u7d22\u5f15 where)"},"content":{"rendered":"<h1 id=\"%e5%84%aa%e5%8c%96%e6%9f%a5%e8%a9%a2%e9%80%9f%e5%ba%a6%ef%bc%8c%e6%95%b8%e6%93%9a%e5%ba%ab%e7%b4%a2%e5%bc%95%e7%9a%84%e7%a5%9e%e5%a5%87%e6%95%88%e6%9e%9c-VHqgitShUq\">\u512a\u5316\u67e5\u8a62\u901f\u5ea6\uff0c\u6578\u64da\u5eab\u7d22\u5f15\u7684\u795e\u5947\u6548\u679c<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u6027\u80fd\u5c0d\u65bc\u61c9\u7528\u7a0b\u5e8f\u7684\u6574\u9ad4\u6548\u7387\u81f3\u95dc\u91cd\u8981\u3002\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u9577\uff0c\u67e5\u8a62\u901f\u5ea6\u7684\u512a\u5316\u8b8a\u5f97\u6108\u52a0\u91cd\u8981\u3002\u6578\u64da\u5eab\u7d22\u5f15\u4f5c\u70ba\u4e00\u7a2e\u6709\u6548\u7684\u6280\u8853\uff0c\u80fd\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u7279\u5225\u662f\u5728\u4f7f\u7528 <code>WHERE<\/code> \u689d\u4ef6\u9032\u884c\u6578\u64da\u6aa2\u7d22\u6642\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u6578\u64da\u5eab\u7d22\u5f15\u7684\u5de5\u4f5c\u539f\u7406\u53ca\u5176\u5728 <code>WHERE<\/code> \u689d\u4ef6\u4e2d\u7684\u61c9\u7528\u6548\u679c\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e6%95%b8%e6%93%9a%e5%ba%ab%e7%b4%a2%e5%bc%95%ef%bc%9f-VHqgitShUq\">\u4ec0\u9ebc\u662f\u6578\u64da\u5eab\u7d22\u5f15\uff1f<\/h2>\n<p>\u6578\u64da\u5eab\u7d22\u5f15\u662f\u4e00\u7a2e\u6578\u64da\u7d50\u69cb\uff0c\u65e8\u5728\u63d0\u9ad8\u67e5\u8a62\u64cd\u4f5c\u7684\u901f\u5ea6\u3002\u5b83\u985e\u4f3c\u65bc\u66f8\u7c4d\u7684\u76ee\u9304\uff0c\u5e6b\u52a9\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff08DBMS\uff09\u5feb\u901f\u5b9a\u4f4d\u6240\u9700\u6578\u64da\u3002\u7d22\u5f15\u53ef\u4ee5\u57fa\u65bc\u4e00\u500b\u6216\u591a\u500b\u5217\u5275\u5efa\uff0c\u4e26\u4e14\u53ef\u4ee5\u662f\u552f\u4e00\u7684\u6216\u975e\u552f\u4e00\u7684\u3002\u5e38\u898b\u7684\u7d22\u5f15\u985e\u578b\u5305\u62ec B \u6a39\u7d22\u5f15\u3001\u54c8\u5e0c\u7d22\u5f15\u548c\u5168\u6587\u7d22\u5f15\u7b49\u3002<\/p>\n<h2 id=\"%e7%b4%a2%e5%bc%95%e7%9a%84%e5%b7%a5%e4%bd%9c%e5%8e%9f%e7%90%86-VHqgitShUq\">\u7d22\u5f15\u7684\u5de5\u4f5c\u539f\u7406<\/h2>\n<p>\u7576\u4e00\u500b\u67e5\u8a62\u88ab\u57f7\u884c\u6642\uff0c\u6578\u64da\u5eab\u9996\u5148\u6703\u6aa2\u67e5\u662f\u5426\u5b58\u5728\u76f8\u95dc\u7684\u7d22\u5f15\u3002\u5982\u679c\u5b58\u5728\uff0c\u6578\u64da\u5eab\u5c07\u4f7f\u7528\u7d22\u5f15\u4f86\u5feb\u901f\u5b9a\u4f4d\u6578\u64da\uff0c\u800c\u4e0d\u662f\u9010\u884c\u6383\u63cf\u6574\u500b\u8868\u3002\u9019\u6a23\u53ef\u4ee5\u986f\u8457\u6e1b\u5c11\u67e5\u8a62\u6240\u9700\u7684\u6642\u9593\u548c\u8cc7\u6e90\u3002<\/p>\n<h3 id=\"%e7%b4%a2%e5%bc%95%e7%9a%84%e7%b5%90%e6%a7%8b-VHqgitShUq\">\u7d22\u5f15\u7684\u7d50\u69cb<\/h3>\n<p>\u4ee5 B \u6a39\u7d22\u5f15\u70ba\u4f8b\uff0c\u9019\u662f\u4e00\u7a2e\u81ea\u5e73\u8861\u7684\u6a39\u5f62\u6578\u64da\u7d50\u69cb\uff0c\u80fd\u5920\u4fdd\u6301\u6578\u64da\u6709\u5e8f\u4e26\u652f\u6301\u9ad8\u6548\u7684\u67e5\u8a62\u3002\u6bcf\u500b\u7bc0\u9ede\u5305\u542b\u4e00\u500b\u9375\u503c\u548c\u6307\u5411\u5b50\u7bc0\u9ede\u7684\u6307\u91dd\u3002\u7576\u67e5\u8a62\u767c\u751f\u6642\uff0c\u6578\u64da\u5eab\u53ef\u4ee5\u901a\u904e\u6bd4\u8f03\u9375\u503c\u4f86\u5feb\u901f\u5c0e\u822a\u5230\u6b63\u78ba\u7684\u7bc0\u9ede\u3002<\/p>\n<h2 id=\"where-%e6%a2%9d%e4%bb%b6%e8%88%87%e7%b4%a2%e5%bc%95%e7%9a%84%e7%b5%90%e5%90%88-VHqgitShUq\">WHERE \u689d\u4ef6\u8207\u7d22\u5f15\u7684\u7d50\u5408<\/h2>\n<p>\u5728 SQL \u67e5\u8a62\u4e2d\uff0c<code>WHERE<\/code> \u689d\u4ef6\u7528\u65bc\u904e\u6ffe\u6578\u64da\u3002\u7576\u67e5\u8a62\u4e2d\u5305\u542b <code>WHERE<\/code> \u689d\u4ef6\u6642\uff0c\u7d22\u5f15\u7684\u4f5c\u7528\u5c24\u70ba\u660e\u986f\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT * FROM users WHERE age &gt; 30;<\/code><\/pre>\n<p>\u5982\u679c\u5728 <code>age<\/code> \u5217\u4e0a\u5275\u5efa\u4e86\u7d22\u5f15\uff0c\u6578\u64da\u5eab\u5c07\u80fd\u5920\u5feb\u901f\u627e\u5230\u6240\u6709\u5e74\u9f61\u5927\u65bc 30 \u7684\u7528\u6236\uff0c\u800c\u4e0d\u5fc5\u6aa2\u67e5\u6bcf\u4e00\u884c\u6578\u64da\u3002\u9019\u6a23\u7684\u512a\u5316\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u5c24\u70ba\u91cd\u8981\u3002<\/p>\n<h3 id=\"%e5%a4%9a%e5%88%97%e7%b4%a2%e5%bc%95%e7%9a%84%e6%87%89%e7%94%a8-VHqgitShUq\">\u591a\u5217\u7d22\u5f15\u7684\u61c9\u7528<\/h3>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u67e5\u8a62\u53ef\u80fd\u6d89\u53ca\u591a\u500b\u5217\u7684\u904e\u6ffe\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT * FROM orders WHERE customer_id = 123 AND order_date &gt; '2023-01-01';<\/code><\/pre>\n<p>\u5728\u9019\u7a2e\u60c5\u6cc1\u4e0b\uff0c\u53ef\u4ee5\u5275\u5efa\u4e00\u500b\u591a\u5217\u7d22\u5f15\uff0c\u6db5\u84cb <code>customer_id<\/code> \u548c <code>order_date<\/code>\u3002\u9019\u6a23\uff0c\u6578\u64da\u5eab\u53ef\u4ee5\u66f4\u9ad8\u6548\u5730\u8655\u7406\u67e5\u8a62\uff0c\u56e0\u70ba\u5b83\u53ef\u4ee5\u540c\u6642\u5229\u7528\u5169\u500b\u689d\u4ef6\u4f86\u7e2e\u5c0f\u641c\u7d22\u7bc4\u570d\u3002<\/p>\n<h2 id=\"%e7%b4%a2%e5%bc%95%e7%9a%84%e6%88%90%e6%9c%ac%e8%88%87%e8%80%83%e9%87%8f-VHqgitShUq\">\u7d22\u5f15\u7684\u6210\u672c\u8207\u8003\u91cf<\/h2>\n<p>\u5118\u7ba1\u7d22\u5f15\u80fd\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u4f46\u5b83\u5011\u4e5f\u6709\u5176\u6210\u672c\u3002\u6bcf\u7576\u5c0d\u8868\u9032\u884c\u63d2\u5165\u3001\u66f4\u65b0\u6216\u522a\u9664\u64cd\u4f5c\u6642\uff0c\u76f8\u95dc\u7684\u7d22\u5f15\u4e5f\u9700\u8981\u88ab\u66f4\u65b0\uff0c\u9019\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\u3002\u56e0\u6b64\uff0c\u5728\u5275\u5efa\u7d22\u5f15\u6642\uff0c\u9700\u8981\u4ed4\u7d30\u8003\u616e\u54ea\u4e9b\u5217\u6700\u5e38\u7528\u65bc\u67e5\u8a62\uff0c\u4e26\u5e73\u8861\u67e5\u8a62\u6027\u80fd\u8207\u5beb\u5165\u6027\u80fd\u4e4b\u9593\u7684\u95dc\u4fc2\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-VHqgitShUq\">\u7d50\u8ad6<\/h2>\n<p>\u6578\u64da\u5eab\u7d22\u5f15\u662f\u4e00\u7a2e\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u901f\u5ea6\uff0c\u7279\u5225\u662f\u5728\u4f7f\u7528 <code>WHERE<\/code> \u689d\u4ef6\u6642\u3002\u901a\u904e\u5408\u7406\u5730\u8a2d\u8a08\u548c\u4f7f\u7528\u7d22\u5f15\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u512a\u5316\u6578\u64da\u6aa2\u7d22\u904e\u7a0b\uff0c\u63d0\u5347\u61c9\u7528\u7a0b\u5e8f\u7684\u6574\u9ad4\u6027\u80fd\u3002\u7136\u800c\uff0c\u7d22\u5f15\u7684\u4f7f\u7528\u4e5f\u9700\u8981\u8b39\u614e\u8003\u91cf\uff0c\u4ee5\u907f\u514d\u5c0d\u6578\u64da\u5beb\u5165\u6027\u80fd\u9020\u6210\u8ca0\u9762\u5f71\u97ff\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u95dc\u65bc\u6578\u64da\u5eab\u6027\u80fd\u512a\u5316\u7684\u8cc7\u8a0a\uff0c\u60a8\u53ef\u4ee5\u8a2a\u554f <a href=\"https:\/\/server.hk\">Server.HK<\/a>\uff0c\u6211\u5011\u63d0\u4f9b\u5404\u7a2e <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u5e6b\u52a9\u60a8\u63d0\u5347\u7db2\u7ad9\u548c\u61c9\u7528\u7684\u6548\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u6578\u64da\u5eab\u7d22\u5f15\u5982\u4f55\u512a\u5316\u67e5\u8a62\u901f\u5ea6\uff0c\u4e86\u89e3WHERE\u689d\u4ef6\u5728\u63d0\u5347\u67e5\u8a62\u6548\u7387\u4e2d\u7684\u95dc\u9375\u4f5c\u7528\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-195167","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/195167","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=195167"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/195167\/revisions"}],"predecessor-version":[{"id":195168,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/195167\/revisions\/195168"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=195167"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=195167"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=195167"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}