{"id":168365,"date":"2024-11-06T11:46:16","date_gmt":"2024-11-06T03:46:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/168365\/"},"modified":"2024-11-06T11:46:16","modified_gmt":"2024-11-06T03:46:16","slug":"sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e5%ad%98%e5%84%b2%e9%81%8b%e7%ae%97%e7%ac%a6%e8%99%9f%ef%bc%9f-sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e8%83%bd%e5%ad%98%e9%81%8b%e7%ae%97%e7%ac%a6%e8%99%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/168365\/","title":{"rendered":"SQL \u6578\u64da\u5eab\u4e2d\u5b58\u5132\u904b\u7b97\u7b26\u865f\uff1f (sql \u6578\u64da\u5eab\u80fd\u5b58\u904b\u7b97\u7b26\u865f)"},"content":{"rendered":"<h1 id=\"sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e4%b8%ad%e5%ad%98%e5%84%b2%e9%81%8b%e7%ae%97%e7%ac%a6%e8%99%9f%ef%bc%9f-IouSFNDUsL\">SQL \u6578\u64da\u5eab\u4e2d\u5b58\u5132\u904b\u7b97\u7b26\u865f\uff1f<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u9a45\u52d5\u4e16\u754c\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u8207\u6578\u64da\u5eab\u4ea4\u4e92\u7684\u4e3b\u8981\u5de5\u5177\u4e4b\u4e00\u3002\u7121\u8ad6\u662f\u9032\u884c\u6578\u64da\u67e5\u8a62\u3001\u66f4\u65b0\u9084\u662f\u7ba1\u7406\uff0cSQL \u90fd\u63d0\u4f9b\u4e86\u5f37\u5927\u7684\u529f\u80fd\u4f86\u8655\u7406\u5404\u7a2e\u6578\u64da\u985e\u578b\u3002\u5728\u9019\u7bc7\u6587\u7ae0\u4e2d\uff0c\u6211\u5011\u5c07\u63a2\u8a0e SQL \u6578\u64da\u5eab\u4e2d\u904b\u7b97\u7b26\u865f\u7684\u5b58\u5132\u53ca\u5176\u4f7f\u7528\u65b9\u5f0f\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e9%81%8b%e7%ae%97%e7%ac%a6%e8%99%9f%ef%bc%9f-IouSFNDUsL\">\u4ec0\u9ebc\u662f\u904b\u7b97\u7b26\u865f\uff1f<\/h2>\n<p>\u904b\u7b97\u7b26\u865f\u662f\u7528\u65bc\u57f7\u884c\u6578\u5b78\u904b\u7b97\u3001\u6bd4\u8f03\u6216\u908f\u8f2f\u64cd\u4f5c\u7684\u7b26\u865f\u3002\u5728 SQL \u4e2d\uff0c\u904b\u7b97\u7b26\u865f\u53ef\u4ee5\u5206\u70ba\u5e7e\u500b\u4e3b\u8981\u985e\u5225\uff1a<\/p>\n<ul>\n<li><strong>\u7b97\u8853\u904b\u7b97\u7b26\uff1a<\/strong>\u7528\u65bc\u6578\u5b78\u8a08\u7b97\uff0c\u5982\u52a0\u6cd5\u3001\u6e1b\u6cd5\u3001\u4e58\u6cd5\u548c\u9664\u6cd5\u3002<\/li>\n<li><strong>\u6bd4\u8f03\u904b\u7b97\u7b26\uff1a<\/strong>\u7528\u65bc\u6bd4\u8f03\u5169\u500b\u503c\uff0c\u5982\u7b49\u65bc\u3001\u4e0d\u7b49\u65bc\u3001\u5927\u65bc\u3001\u5c0f\u65bc\u7b49\u3002<\/li>\n<li><strong>\u908f\u8f2f\u904b\u7b97\u7b26\uff1a<\/strong>\u7528\u65bc\u7d44\u5408\u591a\u500b\u689d\u4ef6\uff0c\u5982 AND\u3001OR \u548c NOT\u3002<\/li>\n<\/ul>\n<h2 id=\"sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e8%83%bd%e5%90%a6%e5%ad%98%e5%84%b2%e9%81%8b%e7%ae%97%e7%ac%a6%e8%99%9f%ef%bc%9f-IouSFNDUsL\">SQL \u6578\u64da\u5eab\u80fd\u5426\u5b58\u5132\u904b\u7b97\u7b26\u865f\uff1f<\/h2>\n<p>\u5728 SQL \u6578\u64da\u5eab\u4e2d\uff0c\u904b\u7b97\u7b26\u865f\u672c\u8eab\u4e26\u4e0d\u76f4\u63a5\u5b58\u5132\uff0c\u800c\u662f\u7528\u65bc\u67e5\u8a62\u548c\u64cd\u4f5c\u6578\u64da\u7684\u5de5\u5177\u3002\u904b\u7b97\u7b26\u865f\u901a\u5e38\u5728 SQL \u8a9e\u53e5\u4e2d\u4f7f\u7528\uff0c\u4ee5\u4fbf\u5c0d\u6578\u64da\u9032\u884c\u8a08\u7b97\u6216\u7be9\u9078\u3002\u4f8b\u5982\uff0c\u7576\u6211\u5011\u9700\u8981\u5f9e\u6578\u64da\u5eab\u4e2d\u67e5\u8a62\u67d0\u500b\u7bc4\u570d\u5167\u7684\u6578\u64da\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528\u6bd4\u8f03\u904b\u7b97\u7b26\u3002<\/p>\n<h3 id=\"%e9%81%8b%e7%ae%97%e7%ac%a6%e8%99%9f%e7%9a%84%e4%bd%bf%e7%94%a8%e7%a4%ba%e4%be%8b-IouSFNDUsL\">\u904b\u7b97\u7b26\u865f\u7684\u4f7f\u7528\u793a\u4f8b<\/h3>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684 SQL \u904b\u7b97\u7b26\u865f\u53ca\u5176\u4f7f\u7528\u793a\u4f8b\uff1a<\/p>\n<pre><code>-- \u4f7f\u7528\u7b97\u8853\u904b\u7b97\u7b26\u9032\u884c\u8a08\u7b97\nSELECT price, quantity, price * quantity AS total\nFROM orders;\n\n-- \u4f7f\u7528\u6bd4\u8f03\u904b\u7b97\u7b26\u7be9\u9078\u6578\u64da\nSELECT * \nFROM products \nWHERE price &gt; 100;\n\n-- \u4f7f\u7528\u908f\u8f2f\u904b\u7b97\u7b26\u7d44\u5408\u689d\u4ef6\nSELECT * \nFROM customers \nWHERE country = 'Hong Kong' AND age &gt; 18;\n<\/code><\/pre>\n<h2 id=\"%e9%81%8b%e7%ae%97%e7%ac%a6%e8%99%9f%e7%9a%84%e5%ad%98%e5%84%b2%e8%88%87%e6%95%b8%e6%93%9a%e9%a1%9e%e5%9e%8b-IouSFNDUsL\">\u904b\u7b97\u7b26\u865f\u7684\u5b58\u5132\u8207\u6578\u64da\u985e\u578b<\/h2>\n<p>\u5118\u7ba1\u904b\u7b97\u7b26\u865f\u672c\u8eab\u4e0d\u6703\u88ab\u5b58\u5132\uff0c\u4f46\u5b83\u5011\u7684\u64cd\u4f5c\u7d50\u679c\u53ef\u4ee5\u5b58\u5132\u5728\u6578\u64da\u5eab\u4e2d\u3002\u9019\u610f\u5473\u8457\uff0c\u7576\u6211\u5011\u4f7f\u7528\u904b\u7b97\u7b26\u9032\u884c\u8a08\u7b97\u6642\uff0c\u7d50\u679c\u53ef\u4ee5\u88ab\u63d2\u5165\u5230\u6578\u64da\u8868\u4e2d\u3002\u4f8b\u5982\uff0c\u6211\u5011\u53ef\u4ee5\u5c07\u8a08\u7b97\u51fa\u7684\u7e3d\u50f9\u5b58\u5132\u5728\u4e00\u500b\u65b0\u7684\u5217\u4e2d\u3002<\/p>\n<pre><code>-- \u5c07\u8a08\u7b97\u7d50\u679c\u63d2\u5165\u5230\u65b0\u8868\u4e2d\nINSERT INTO sales_summary (product_id, total_sales)\nSELECT product_id, SUM(price * quantity) \nFROM orders \nGROUP BY product_id;\n<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-IouSFNDUsL\">\u7d50\u8ad6<\/h2>\n<p>\u7e3d\u7d50\u4f86\u8aaa\uff0cSQL \u6578\u64da\u5eab\u4e2d\u4e26\u4e0d\u76f4\u63a5\u5b58\u5132\u904b\u7b97\u7b26\u865f\uff0c\u800c\u662f\u5229\u7528\u9019\u4e9b\u904b\u7b97\u7b26\u865f\u4f86\u9032\u884c\u6578\u64da\u7684\u67e5\u8a62\u548c\u64cd\u4f5c\u3002\u904b\u7b97\u7b26\u865f\u5728 SQL \u8a9e\u53e5\u4e2d\u626e\u6f14\u8457\u91cd\u8981\u7684\u89d2\u8272\uff0c\u5e6b\u52a9\u7528\u6236\u6709\u6548\u5730\u8655\u7406\u548c\u5206\u6790\u6578\u64da\u3002\u7121\u8ad6\u662f\u9032\u884c\u7c21\u55ae\u7684\u6578\u5b78\u8a08\u7b97\u9084\u662f\u8907\u96dc\u7684\u6578\u64da\u7be9\u9078\uff0c\u904b\u7b97\u7b26\u865f\u90fd\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u5de5\u5177\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728 SQL \u6578\u64da\u5eab\u4e2d\u4f7f\u7528\u904b\u7b97\u7b26\u865f\u6709\u9032\u4e00\u6b65\u7684\u8208\u8da3\uff0c\u6216\u8005\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u95dc\u65bc <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u7684\u8cc7\u8a0a\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\uff0c\u7372\u53d6\u66f4\u591a\u8cc7\u6e90\u548c\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u5728 SQL \u6578\u64da\u5eab\u4e2d\u5b58\u5132\u904b\u7b97\u7b26\u865f\uff0c\u63a2\u7d22\u5176\u61c9\u7528\u53ca\u6700\u4f73\u5be6\u8e10\uff0c\u63d0\u5347\u6578\u64da\u7ba1\u7406\u6548\u7387\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-168365","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168365","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=168365"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168365\/revisions"}],"predecessor-version":[{"id":168366,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/168365\/revisions\/168366"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=168365"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=168365"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=168365"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}