{"id":144043,"date":"2024-11-01T03:27:20","date_gmt":"2024-10-31T19:27:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/144043\/"},"modified":"2024-11-01T03:27:21","modified_gmt":"2024-10-31T19:27:21","slug":"sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e7%b5%b1%e8%a8%88%e6%9f%a5%e8%a9%a2%e5%af%a6%e7%8f%be%e6%8a%80%e5%b7%a7-%e6%95%b8%e6%93%9a%e5%ba%ab-sql-%e7%b5%b1%e8%a8%88%e6%9f%a5%e8%a9%a2","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/144043\/","title":{"rendered":"SQL \u6578\u64da\u5eab\u7d71\u8a08\u67e5\u8a62\u5be6\u73fe\u6280\u5de7 (\u6578\u64da\u5eab sql \u7d71\u8a08\u67e5\u8a62)"},"content":{"rendered":"<h1 id=\"sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e7%b5%b1%e8%a8%88%e6%9f%a5%e8%a9%a2%e5%af%a6%e7%8f%be%e6%8a%80%e5%b7%a7-%e6%95%b8%e6%93%9a%e5%ba%ab-sql-%e7%b5%b1%e8%a8%88%e6%9f%a5%e8%a9%a2-QraoRxlhPX\">SQL \u6578\u64da\u5eab\u7d71\u8a08\u67e5\u8a62\u5be6\u73fe\u6280\u5de7 (\u6578\u64da\u5eab sql \u7d71\u8a08\u67e5\u8a62)<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u6210\u70ba\u4e86\u6578\u64da\u5eab\u7ba1\u7406\u548c\u6578\u64da\u5206\u6790\u7684\u6838\u5fc3\u5de5\u5177\u3002\u7121\u8ad6\u662f\u4f01\u696d\u9084\u662f\u500b\u4eba\uff0c\u5c0d\u6578\u64da\u7684\u5206\u6790\u548c\u7d71\u8a08\u67e5\u8a62\u90fd\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u4e00\u4e9b\u5be6\u73fe SQL \u6578\u64da\u5eab\u7d71\u8a08\u67e5\u8a62\u7684\u6280\u5de7\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u6709\u6548\u5730\u5f9e\u6578\u64da\u4e2d\u63d0\u53d6\u6709\u50f9\u503c\u7684\u4fe1\u606f\u3002<\/p>\n<h2 id=\"1-%e7%90%86%e8%a7%a3%e5%9f%ba%e6%9c%ac%e7%9a%84%e7%b5%b1%e8%a8%88%e5%87%bd%e6%95%b8-QraoRxlhPX\">1. \u7406\u89e3\u57fa\u672c\u7684\u7d71\u8a08\u51fd\u6578<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u6709\u5e7e\u500b\u57fa\u672c\u7684\u7d71\u8a08\u51fd\u6578\u53ef\u4ee5\u5e6b\u52a9\u6211\u5011\u9032\u884c\u6578\u64da\u5206\u6790\uff1a<\/p>\n<ul>\n<li><code>COUNT()<\/code>\uff1a\u8a08\u7b97\u884c\u6578\u3002<\/li>\n<li><code>SUM()<\/code>\uff1a\u8a08\u7b97\u6578\u503c\u7684\u7e3d\u548c\u3002<\/li>\n<li><code>AVG()<\/code>\uff1a\u8a08\u7b97\u6578\u503c\u7684\u5e73\u5747\u503c\u3002<\/li>\n<li><code>MIN()<\/code>\uff1a\u627e\u51fa\u6700\u5c0f\u503c\u3002<\/li>\n<li><code>MAX()<\/code>\uff1a\u627e\u51fa\u6700\u5927\u503c\u3002<\/li>\n<\/ul>\n<p>\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>sales<\/code> \u7684\u8868\u683c\uff0c\u5305\u542b\u92b7\u552e\u6578\u64da\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\u4f86\u8a08\u7b97\u7e3d\u92b7\u552e\u984d\uff1a<\/p>\n<pre><code>SELECT SUM(amount) AS total_sales FROM sales;<\/code><\/pre>\n<h2>2. \u4f7f\u7528 <code>GROUP BY<\/code> \u9032\u884c\u5206\u7d44\u7d71\u8a08<\/h2>\n<p>\u7576\u9700\u8981\u5c0d\u6578\u64da\u9032\u884c\u5206\u7d44\u7d71\u8a08\u6642\uff0c<code>GROUP BY<\/code> \u5b50\u53e5\u662f\u975e\u5e38\u6709\u7528\u7684\u3002\u5b83\u53ef\u4ee5\u5c07\u6578\u64da\u6309\u7279\u5b9a\u5217\u9032\u884c\u5206\u7d44\uff0c\u4e26\u5c0d\u6bcf\u7d44\u6578\u64da\u9032\u884c\u7d71\u8a08\u8a08\u7b97\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u60f3\u8981\u6309\u7522\u54c1\u985e\u5225\u8a08\u7b97\u6bcf\u500b\u985e\u5225\u7684\u92b7\u552e\u7e3d\u984d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT category, SUM(amount) AS total_sales\nFROM sales\nGROUP BY category;<\/code><\/pre>\n<h2>3. \u4f7f\u7528 <code>HAVING<\/code> \u9032\u884c\u904e\u6ffe<\/h2>\n<p>\u5728\u4f7f\u7528 <code>GROUP BY<\/code> \u9032\u884c\u5206\u7d44\u7d71\u8a08\u5f8c\uff0c\u53ef\u80fd\u9700\u8981\u5c0d\u7d50\u679c\u9032\u884c\u904e\u6ffe\u3002\u9019\u6642\u53ef\u4ee5\u4f7f\u7528 <code>HAVING<\/code> \u5b50\u53e5\u3002<code>HAVING<\/code> \u5141\u8a31\u6211\u5011\u5c0d\u805a\u5408\u7d50\u679c\u9032\u884c\u904e\u6ffe\uff0c\u9019\u8207 <code>WHERE<\/code> \u5b50\u53e5\u7684\u4f5c\u7528\u4e0d\u540c\uff0c\u56e0\u70ba <code>WHERE<\/code> \u662f\u5728\u805a\u5408\u4e4b\u524d\u9032\u884c\u904e\u6ffe\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u53ea\u60f3\u67e5\u770b\u92b7\u552e\u7e3d\u984d\u8d85\u904e 1000 \u7684\u7522\u54c1\u985e\u5225\uff0c\u53ef\u4ee5\u9019\u6a23\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT category, SUM(amount) AS total_sales\nFROM sales\nGROUP BY category\nHAVING SUM(amount) &gt; 1000;<\/code><\/pre>\n<h2>4. \u4f7f\u7528 <code>JOIN<\/code> \u9032\u884c\u591a\u8868\u67e5\u8a62<\/h2>\n<p>\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u6578\u64da\u901a\u5e38\u5206\u6563\u5728\u591a\u500b\u8868\u4e2d\u3002\u4f7f\u7528 <code>JOIN<\/code> \u53ef\u4ee5\u5c07\u9019\u4e9b\u8868\u9023\u63a5\u8d77\u4f86\uff0c\u9032\u884c\u66f4\u8907\u96dc\u7684\u7d71\u8a08\u67e5\u8a62\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b <code>products<\/code> \u8868\u548c\u4e00\u500b <code>sales<\/code> \u8868\uff0c\u6211\u5011\u60f3\u8981\u67e5\u8a62\u6bcf\u500b\u7522\u54c1\u7684\u92b7\u552e\u7e3d\u984d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT p.product_name, SUM(s.amount) AS total_sales\nFROM products p\nJOIN sales s ON p.product_id = s.product_id\nGROUP BY p.product_name;<\/code><\/pre>\n<h2 id=\"5-%e4%bd%bf%e7%94%a8%e7%aa%97%e5%8f%a3%e5%87%bd%e6%95%b8%e9%80%b2%e8%a1%8c%e9%ab%98%e7%b4%9a%e5%88%86%e6%9e%90-QraoRxlhPX\">5. \u4f7f\u7528\u7a97\u53e3\u51fd\u6578\u9032\u884c\u9ad8\u7d1a\u5206\u6790<\/h2>\n<p>\u7a97\u53e3\u51fd\u6578\u662f\u4e00\u7a2e\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u5728\u4e0d\u6539\u8b8a\u7d50\u679c\u96c6\u7684\u60c5\u6cc1\u4e0b\u9032\u884c\u9ad8\u7d1a\u5206\u6790\u3002\u5b83\u5011\u5141\u8a31\u6211\u5011\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528\u805a\u5408\u51fd\u6578\uff0c\u4e26\u4e14\u53ef\u4ee5\u5728\u6bcf\u4e00\u884c\u4e0a\u9032\u884c\u8a08\u7b97\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u60f3\u8981\u8a08\u7b97\u6bcf\u500b\u7522\u54c1\u7684\u92b7\u552e\u984d\u4f54\u7e3d\u92b7\u552e\u984d\u7684\u6bd4\u4f8b\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT product_name, \n       SUM(amount) AS total_sales,\n       SUM(amount) \/ SUM(SUM(amount)) OVER () AS sales_percentage\nFROM sales\nJOIN products ON sales.product_id = products.product_id\nGROUP BY product_name;<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-QraoRxlhPX\">\u7e3d\u7d50<\/h2>\n<p>\u638c\u63e1 SQL \u6578\u64da\u5eab\u7684\u7d71\u8a08\u67e5\u8a62\u6280\u5de7\u5c0d\u65bc\u6578\u64da\u5206\u6790\u81f3\u95dc\u91cd\u8981\u3002\u901a\u904e\u4f7f\u7528\u57fa\u672c\u7684\u7d71\u8a08\u51fd\u6578\u3001\u5206\u7d44\u3001\u904e\u6ffe\u3001\u9023\u63a5\u548c\u7a97\u53e3\u51fd\u6578\uff0c\u60a8\u53ef\u4ee5\u5f9e\u6578\u64da\u4e2d\u63d0\u53d6\u51fa\u6709\u50f9\u503c\u7684\u898b\u89e3\u3002\u9019\u4e9b\u6280\u5de7\u4e0d\u50c5\u80fd\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\uff0c\u9084\u80fd\u5e6b\u52a9\u60a8\u66f4\u597d\u5730\u7406\u89e3\u6578\u64da\u80cc\u5f8c\u7684\u6545\u4e8b\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u9700\u6c42\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u9069\u5408\u5404\u7a2e\u696d\u52d9\u9700\u6c42\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u638c\u63e1 SQL \u6578\u64da\u5eab\u7d71\u8a08\u67e5\u8a62\u7684\u5be6\u73fe\u6280\u5de7\uff0c\u63d0\u5347\u6578\u64da\u5206\u6790\u80fd\u529b\uff0c\u5feb\u901f\u7372\u53d6\u95dc\u9375\u6578\u64da\u6d1e\u5bdf\uff0c\u512a\u5316\u696d\u52d9\u6c7a\u7b56\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-144043","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144043","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=144043"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144043\/revisions"}],"predecessor-version":[{"id":144044,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/144043\/revisions\/144044"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=144043"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=144043"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=144043"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}