{"id":186150,"date":"2024-11-11T03:31:19","date_gmt":"2024-11-10T19:31:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/186150\/"},"modified":"2024-11-11T03:31:19","modified_gmt":"2024-11-10T19:31:19","slug":"%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e8%a8%88%e7%ae%97%e7%b0%a1%e4%bb%8b%ef%bc%88%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e8%a8%88%e7%ae%97%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/186150\/","title":{"rendered":"\u6578\u64da\u5eab\u8868\u8a08\u7b97\u7c21\u4ecb\uff08\u6578\u64da\u5eab\u8868\u8a08\u7b97\uff09"},"content":{"rendered":"<h1 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e8%a8%88%e7%ae%97%e7%b0%a1%e4%bb%8b%ef%bc%88%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e8%a8%88%e7%ae%97%ef%bc%89-PjReBJDkqD\">\u6578\u64da\u5eab\u8868\u8a08\u7b97\u7c21\u4ecb\uff08\u6578\u64da\u5eab\u8868\u8a08\u7b97\uff09<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u9a45\u52d5\u6642\u4ee3\uff0c\u6578\u64da\u5eab\u7684\u7ba1\u7406\u548c\u8a08\u7b97\u8b8a\u5f97\u8d8a\u4f86\u8d8a\u91cd\u8981\u3002\u6578\u64da\u5eab\u8868\u8a08\u7b97\u662f\u6307\u5728\u6578\u64da\u5eab\u4e2d\u5c0d\u8868\u9032\u884c\u7684\u5404\u7a2e\u8a08\u7b97\u548c\u64cd\u4f5c\uff0c\u9019\u4e9b\u64cd\u4f5c\u53ef\u4ee5\u5e6b\u52a9\u7528\u6236\u66f4\u597d\u5730\u7406\u89e3\u548c\u5229\u7528\u6578\u64da\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u6578\u64da\u5eab\u8868\u8a08\u7b97\u7684\u57fa\u672c\u6982\u5ff5\u3001\u5e38\u898b\u64cd\u4f5c\u4ee5\u53ca\u5176\u5728\u5be6\u969b\u61c9\u7528\u4e2d\u7684\u91cd\u8981\u6027\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e8%a8%88%e7%ae%97%ef%bc%9f-PjReBJDkqD\">\u4ec0\u9ebc\u662f\u6578\u64da\u5eab\u8868\u8a08\u7b97\uff1f<\/h2>\n<p>\u6578\u64da\u5eab\u8868\u8a08\u7b97\u662f\u6307\u5728\u6578\u64da\u5eab\u4e2d\u5c0d\u8868\u683c\u6578\u64da\u9032\u884c\u7684\u8a08\u7b97\u548c\u5206\u6790\u3002\u9019\u4e9b\u8a08\u7b97\u53ef\u4ee5\u5305\u62ec\u6578\u64da\u7684\u805a\u5408\u3001\u904e\u6ffe\u3001\u6392\u5e8f\u548c\u806f\u63a5\u7b49\u64cd\u4f5c\u3002\u6578\u64da\u5eab\u8868\u901a\u5e38\u7531\u884c\u548c\u5217\u7d44\u6210\uff0c\u6bcf\u4e00\u884c\u4ee3\u8868\u4e00\u689d\u8a18\u9304\uff0c\u6bcf\u4e00\u5217\u4ee3\u8868\u4e00\u500b\u5c6c\u6027\u3002\u901a\u904e\u5c0d\u9019\u4e9b\u6578\u64da\u9032\u884c\u8a08\u7b97\uff0c\u4f7f\u7528\u8005\u53ef\u4ee5\u7372\u5f97\u6709\u50f9\u503c\u7684\u4fe1\u606f\uff0c\u5f9e\u800c\u652f\u6301\u6c7a\u7b56\u904e\u7a0b\u3002<\/p>\n<h2 id=\"%e5%b8%b8%e8%a6%8b%e7%9a%84%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e8%a8%88%e7%ae%97%e6%93%8d%e4%bd%9c-PjReBJDkqD\">\u5e38\u898b\u7684\u6578\u64da\u5eab\u8868\u8a08\u7b97\u64cd\u4f5c<\/h2>\n<ul>\n<li><strong>\u805a\u5408\u51fd\u6578<\/strong>: \u805a\u5408\u51fd\u6578\u5982 <code>SUM()<\/code>\u3001<code>AVG()<\/code>\u3001<code>COUNT()<\/code> \u7b49\u53ef\u4ee5\u7528\u4f86\u8a08\u7b97\u6578\u64da\u7684\u7e3d\u548c\u3001\u5e73\u5747\u503c\u548c\u8a18\u9304\u6578\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u8a08\u7b97\u67d0\u500b\u7522\u54c1\u7684\u7e3d\u92b7\u552e\u984d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u67e5\u8a62\uff1a<\/li>\n<pre><code>SELECT SUM(sales) FROM products;<\/code><\/pre>\n<li><strong>\u904e\u6ffe\u6578\u64da<\/strong>: \u4f7f\u7528 <code>WHERE<\/code> \u5b50\u53e5\u53ef\u4ee5\u904e\u6ffe\u51fa\u7b26\u5408\u7279\u5b9a\u689d\u4ef6\u7684\u6578\u64da\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u67e5\u8a62\u92b7\u552e\u984d\u5927\u65bc1000\u7684\u7522\u54c1\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/li>\n<pre><code>SELECT * FROM products WHERE sales &gt; 1000;<\/code><\/pre>\n<li><strong>\u6392\u5e8f\u6578\u64da<\/strong>: \u4f7f\u7528 <code>ORDER BY<\/code> \u5b50\u53e5\u53ef\u4ee5\u5c0d\u67e5\u8a62\u7d50\u679c\u9032\u884c\u6392\u5e8f\u3002\u4ee5\u4e0b\u67e5\u8a62\u5c07\u6839\u64da\u92b7\u552e\u984d\u5c0d\u7522\u54c1\u9032\u884c\u964d\u5e8f\u6392\u5e8f\uff1a<\/li>\n<pre><code>SELECT * FROM products ORDER BY sales DESC;<\/code><\/pre>\n<li><strong>\u806f\u63a5\u64cd\u4f5c<\/strong>: \u806f\u63a5\u64cd\u4f5c\u53ef\u4ee5\u5c07\u591a\u500b\u8868\u4e2d\u7684\u6578\u64da\u7d50\u5408\u5728\u4e00\u8d77\u3002\u4f7f\u7528 <code>JOIN<\/code> \u5b50\u53e5\u53ef\u4ee5\u5be6\u73fe\u9019\u4e00\u9ede\u3002\u4f8b\u5982\uff0c\u82e5\u8981\u67e5\u8a62\u6bcf\u500b\u7522\u54c1\u53ca\u5176\u985e\u5225\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/li>\n<pre><code>SELECT products.name, categories.name FROM products\nJOIN categories ON products.category_id = categories.id;<\/code><\/pre>\n<\/ul>\n<h2 id=\"%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a1%a8%e8%a8%88%e7%ae%97%e7%9a%84%e6%87%89%e7%94%a8-PjReBJDkqD\">\u6578\u64da\u5eab\u8868\u8a08\u7b97\u7684\u61c9\u7528<\/h2>\n<p>\u6578\u64da\u5eab\u8868\u8a08\u7b97\u5728\u5404\u884c\u5404\u696d\u4e2d\u90fd\u6709\u5ee3\u6cdb\u7684\u61c9\u7528\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u61c9\u7528\u5834\u666f\uff1a<\/p>\n<ul>\n<li><strong>\u5546\u696d\u5206\u6790<\/strong>: \u4f01\u696d\u53ef\u4ee5\u901a\u904e\u6578\u64da\u5eab\u8868\u8a08\u7b97\u4f86\u5206\u6790\u92b7\u552e\u6578\u64da\u3001\u5ba2\u6236\u884c\u70ba\u7b49\uff0c\u5f9e\u800c\u5236\u5b9a\u66f4\u6709\u6548\u7684\u5e02\u5834\u7b56\u7565\u3002<\/li>\n<li><strong>\u8ca1\u52d9\u5831\u544a<\/strong>: \u8ca1\u52d9\u90e8\u9580\u53ef\u4ee5\u5229\u7528\u6578\u64da\u5eab\u8868\u8a08\u7b97\u4f86\u751f\u6210\u5831\u544a\uff0c\u5e6b\u52a9\u7ba1\u7406\u5c64\u4e86\u89e3\u516c\u53f8\u7684\u8ca1\u52d9\u72c0\u6cc1\u3002<\/li>\n<li><strong>\u6578\u64da\u6316\u6398<\/strong>: \u901a\u904e\u5c0d\u6578\u64da\u9032\u884c\u8a08\u7b97\u548c\u5206\u6790\uff0c\u4f01\u696d\u53ef\u4ee5\u767c\u73fe\u6f5b\u5728\u7684\u5546\u6a5f\u548c\u98a8\u96aa\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-PjReBJDkqD\">\u7d50\u8ad6<\/h2>\n<p>\u6578\u64da\u5eab\u8868\u8a08\u7b97\u662f\u6578\u64da\u7ba1\u7406\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\uff0c\u5b83\u5e6b\u52a9\u7528\u6236\u5f9e\u5927\u91cf\u6578\u64da\u4e2d\u63d0\u53d6\u6709\u50f9\u503c\u7684\u4fe1\u606f\u3002\u7121\u8ad6\u662f\u5728\u5546\u696d\u5206\u6790\u3001\u8ca1\u52d9\u5831\u544a\u9084\u662f\u6578\u64da\u6316\u6398\u4e2d\uff0c\u6578\u64da\u5eab\u8868\u8a08\u7b97\u90fd\u767c\u63ee\u8457\u91cd\u8981\u7684\u4f5c\u7528\u3002\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u9577\uff0c\u638c\u63e1\u6578\u64da\u5eab\u8868\u8a08\u7b97\u7684\u6280\u80fd\u5c07\u8b8a\u5f97\u8d8a\u4f86\u8d8a\u91cd\u8981\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u74b0\u5883\u4e2d\u9032\u884c\u6578\u64da\u5eab\u7ba1\u7406\u548c\u8a08\u7b97\u6709\u8208\u8da3\uff0cServer.HK \u63d0\u4f9b\u4e86\u591a\u7a2e\u89e3\u6c7a\u65b9\u6848\uff0c\u5e6b\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u548c\u5206\u6790\u6578\u64da\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u6578\u64da\u5eab\u8868\u8a08\u7b97\u7684\u57fa\u672c\u6982\u5ff5\uff0c\u63a2\u7d22\u5982\u4f55\u6709\u6548\u7ba1\u7406\u548c\u5206\u6790\u6578\u64da\uff0c\u63d0\u5347\u6578\u64da\u8655\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-186150","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/186150","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=186150"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/186150\/revisions"}],"predecessor-version":[{"id":186151,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/186150\/revisions\/186151"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=186150"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=186150"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=186150"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}