{"id":162423,"date":"2024-11-04T14:58:21","date_gmt":"2024-11-04T06:58:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/162423\/"},"modified":"2024-11-04T14:58:22","modified_gmt":"2024-11-04T06:58:22","slug":"%e7%b0%a1%e5%96%ae%e6%98%93%e6%87%82%e7%9a%84%e6%96%b9%e6%b3%95%ef%bc%9a%e7%8d%b2%e5%8f%96%e6%95%b8%e6%93%9a%e5%ba%ab%e6%97%a5%e6%9c%9f%e5%ad%97%e6%ae%b5%e6%9c%80%e6%96%b0%e6%99%82%e9%96%93-%e7%8d%b2","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/162423\/","title":{"rendered":"\u7c21\u55ae\u6613\u61c2\u7684\u65b9\u6cd5\uff1a\u7372\u53d6\u6578\u64da\u5eab\u65e5\u671f\u5b57\u6bb5\u6700\u65b0\u6642\u9593 (\u7372\u53d6\u6578\u64da\u5eab\u65e5\u671f\u5b57\u6bb5\u6700\u65b0\u6642\u9593)"},"content":{"rendered":"<h1 id=\"%e7%b0%a1%e5%96%ae%e6%98%93%e6%87%82%e7%9a%84%e6%96%b9%e6%b3%95%ef%bc%9a%e7%8d%b2%e5%8f%96%e6%95%b8%e6%93%9a%e5%ba%ab%e6%97%a5%e6%9c%9f%e5%ad%97%e6%ae%b5%e6%9c%80%e6%96%b0%e6%99%82%e9%96%93-HGufrZvusr\">\u7c21\u55ae\u6613\u61c2\u7684\u65b9\u6cd5\uff1a\u7372\u53d6\u6578\u64da\u5eab\u65e5\u671f\u5b57\u6bb5\u6700\u65b0\u6642\u9593<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u7372\u53d6\u65e5\u671f\u5b57\u6bb5\u7684\u6700\u65b0\u6642\u9593\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f\u7528\u65bc\u5831\u544a\u3001\u6578\u64da\u5206\u6790\u9084\u662f\u7cfb\u7d71\u76e3\u63a7\uff0c\u4e86\u89e3\u5982\u4f55\u6709\u6548\u5730\u67e5\u8a62\u6700\u65b0\u7684\u65e5\u671f\u6642\u9593\u4fe1\u606f\u90fd\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5e7e\u7a2e\u7c21\u55ae\u6613\u61c2\u7684\u65b9\u6cd5\u4f86\u7372\u53d6\u6578\u64da\u5eab\u4e2d\u65e5\u671f\u5b57\u6bb5\u7684\u6700\u65b0\u6642\u9593\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684\u793a\u4f8b\u4ee3\u78bc\u3002<\/p>\n<h2 id=\"1-%e4%bd%bf%e7%94%a8-sql-%e6%9f%a5%e8%a9%a2%e7%8d%b2%e5%8f%96%e6%9c%80%e6%96%b0%e6%97%a5%e6%9c%9f-HGufrZvusr\">1. \u4f7f\u7528 SQL \u67e5\u8a62\u7372\u53d6\u6700\u65b0\u65e5\u671f<\/h2>\n<p>\u6700\u76f4\u63a5\u7684\u65b9\u6cd5\u662f\u4f7f\u7528 SQL \u67e5\u8a62\u4f86\u7372\u53d6\u6700\u65b0\u7684\u65e5\u671f\u6642\u9593\u3002\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>orders<\/code> \u7684\u8868\uff0c\u4e26\u4e14\u8a72\u8868\u4e2d\u6709\u4e00\u500b\u540d\u70ba <code>order_date<\/code> \u7684\u65e5\u671f\u5b57\u6bb5\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b SQL \u67e5\u8a62\u4f86\u7372\u53d6\u6700\u65b0\u7684\u8a02\u55ae\u65e5\u671f\uff1a<\/p>\n<pre><code>SELECT MAX(order_date) AS latest_order_date FROM orders;<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de <code>orders<\/code> \u8868\u4e2d <code>order_date<\/code> \u5b57\u6bb5\u7684\u6700\u5927\u503c\uff0c\u5373\u6700\u65b0\u7684\u8a02\u55ae\u65e5\u671f\u3002<\/p>\n<h2 id=\"2-%e4%bd%bf%e7%94%a8-group-by-%e7%8d%b2%e5%8f%96%e6%af%8f%e5%80%8b%e7%94%a8%e6%88%b6%e7%9a%84%e6%9c%80%e6%96%b0%e6%97%a5%e6%9c%9f-HGufrZvusr\">2. \u4f7f\u7528 GROUP BY \u7372\u53d6\u6bcf\u500b\u7528\u6236\u7684\u6700\u65b0\u65e5\u671f<\/h2>\n<p>\u5982\u679c\u6211\u5011\u60f3\u8981\u7372\u53d6\u6bcf\u500b\u7528\u6236\u7684\u6700\u65b0\u8a02\u55ae\u65e5\u671f\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>GROUP BY<\/code> \u5b50\u53e5\u3002\u5047\u8a2d <code>orders<\/code> \u8868\u4e2d\u9084\u6709\u4e00\u500b <code>user_id<\/code> \u5b57\u6bb5\uff0c\u6211\u5011\u53ef\u4ee5\u9019\u6a23\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT user_id, MAX(order_date) AS latest_order_date \nFROM orders \nGROUP BY user_id;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u5c07\u8fd4\u56de\u6bcf\u500b\u7528\u6236\u7684\u6700\u65b0\u8a02\u55ae\u65e5\u671f\uff0c\u5e6b\u52a9\u6211\u5011\u4e86\u89e3\u6bcf\u4f4d\u7528\u6236\u7684\u6d3b\u52d5\u60c5\u6cc1\u3002<\/p>\n<h2 id=\"3-%e4%bd%bf%e7%94%a8%e5%ad%90%e6%9f%a5%e8%a9%a2%e7%8d%b2%e5%8f%96%e6%9c%80%e6%96%b0%e6%97%a5%e6%9c%9f-HGufrZvusr\">3. \u4f7f\u7528\u5b50\u67e5\u8a62\u7372\u53d6\u6700\u65b0\u65e5\u671f<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u6211\u5011\u53ef\u80fd\u9700\u8981\u7372\u53d6\u6700\u65b0\u65e5\u671f\u7684\u5176\u4ed6\u76f8\u95dc\u4fe1\u606f\u3002\u9019\u6642\u53ef\u4ee5\u4f7f\u7528\u5b50\u67e5\u8a62\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u60f3\u8981\u7372\u53d6\u6700\u65b0\u8a02\u55ae\u7684\u8a73\u7d30\u4fe1\u606f\uff0c\u53ef\u4ee5\u9019\u6a23\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT * FROM orders \nWHERE order_date = (SELECT MAX(order_date) FROM orders);<\/code><\/pre>\n<p>\u9019\u689d\u67e5\u8a62\u5c07\u8fd4\u56de\u6700\u65b0\u8a02\u55ae\u7684\u6240\u6709\u5b57\u6bb5\u4fe1\u606f\uff0c\u8b93\u6211\u5011\u80fd\u5920\u7372\u53d6\u66f4\u5168\u9762\u7684\u6578\u64da\u3002<\/p>\n<h2 id=\"4-%e4%bd%bf%e7%94%a8%e6%99%82%e9%96%93%e6%88%b3%e9%80%b2%e8%a1%8c%e6%af%94%e8%bc%83-HGufrZvusr\">4. \u4f7f\u7528\u6642\u9593\u6233\u9032\u884c\u6bd4\u8f03<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u65e5\u671f\u5b57\u6bb5\u53ef\u80fd\u4ee5\u6642\u9593\u6233\u7684\u5f62\u5f0f\u5b58\u5132\u3002\u9019\u6642\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528 <code>FROM_UNIXTIME<\/code> \u51fd\u6578\u5c07\u6642\u9593\u6233\u8f49\u63db\u70ba\u65e5\u671f\u683c\u5f0f\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>SELECT MAX(FROM_UNIXTIME(order_timestamp)) AS latest_order_date \nFROM orders;<\/code><\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6211\u5011\u7372\u53d6\u5230\u6b63\u78ba\u7684\u6700\u65b0\u65e5\u671f\u6642\u9593\u3002<\/p>\n<h2 id=\"5-%e6%95%b8%e6%93%9a%e5%ba%ab%e6%80%a7%e8%83%bd%e8%80%83%e9%87%8f-HGufrZvusr\">5. \u6578\u64da\u5eab\u6027\u80fd\u8003\u91cf<\/h2>\n<p>\u5728\u57f7\u884c\u9019\u4e9b\u67e5\u8a62\u6642\uff0c\u7279\u5225\u662f\u5728\u5927\u578b\u6578\u64da\u5eab\u4e2d\uff0c\u6027\u80fd\u662f\u9700\u8981\u8003\u616e\u7684\u91cd\u8981\u56e0\u7d20\u3002\u70ba\u4e86\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\uff0c\u53ef\u4ee5\u8003\u616e\u5c0d\u65e5\u671f\u5b57\u6bb5\u5efa\u7acb\u7d22\u5f15\u3002\u9019\u6a23\u53ef\u4ee5\u52a0\u5feb\u67e5\u8a62\u901f\u5ea6\uff0c\u7279\u5225\u662f\u5728\u9032\u884c <code>MAX<\/code> \u6216 <code>GROUP BY<\/code> \u64cd\u4f5c\u6642\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-HGufrZvusr\">\u7e3d\u7d50<\/h2>\n<p>\u7372\u53d6\u6578\u64da\u5eab\u65e5\u671f\u5b57\u6bb5\u7684\u6700\u65b0\u6642\u9593\u662f\u4e00\u9805\u57fa\u672c\u4f46\u91cd\u8981\u7684\u6280\u80fd\u3002\u901a\u904e\u4f7f\u7528 SQL \u67e5\u8a62\u3001\u5b50\u67e5\u8a62\u548c\u9069\u7576\u7684\u7d22\u5f15\uff0c\u6211\u5011\u53ef\u4ee5\u9ad8\u6548\u5730\u7372\u53d6\u6240\u9700\u7684\u6578\u64da\u3002\u7121\u8ad6\u662f\u7528\u65bc\u696d\u52d9\u5831\u544a\u9084\u662f\u6578\u64da\u5206\u6790\uff0c\u638c\u63e1\u9019\u4e9b\u6280\u5de7\u90fd\u80fd\u5e6b\u52a9\u6211\u5011\u66f4\u597d\u5730\u7ba1\u7406\u548c\u5229\u7528\u6578\u64da\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\u5e6b\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u548c\u64f4\u5c55\u60a8\u7684\u696d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u7c21\u55ae\u6613\u61c2\u7684\u65b9\u6cd5\uff0c\u5feb\u901f\u7372\u53d6\u6578\u64da\u5eab\u4e2d\u65e5\u671f\u5b57\u6bb5\u7684\u6700\u65b0\u6642\u9593\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-162423","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162423","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=162423"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162423\/revisions"}],"predecessor-version":[{"id":162424,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162423\/revisions\/162424"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=162423"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=162423"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=162423"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}