{"id":143993,"date":"2024-11-01T02:58:19","date_gmt":"2024-10-31T18:58:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/143993\/"},"modified":"2024-11-01T02:58:20","modified_gmt":"2024-10-31T18:58:20","slug":"sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e5%b0%87%e6%a9%ab%e5%90%91%e6%95%b8%e6%93%9a%e8%bd%89%e6%8f%9b%e7%82%ba%e7%b8%b1%e5%90%91%e5%ad%97%e6%ae%b5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/143993\/","title":{"rendered":"SQL \u6578\u64da\u5eab\u5c07\u6a6b\u5411\u6578\u64da\u8f49\u63db\u70ba\u7e31\u5411\u5b57\u6bb5"},"content":{"rendered":"<h1 id=\"sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e5%b0%87%e6%a9%ab%e5%90%91%e6%95%b8%e6%93%9a%e8%bd%89%e6%8f%9b%e7%82%ba%e7%b8%b1%e5%90%91%e5%ad%97%e6%ae%b5-PYuIueFifG\">SQL \u6578\u64da\u5eab\u5c07\u6a6b\u5411\u6578\u64da\u8f49\u63db\u70ba\u7e31\u5411\u5b57\u6bb5<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u6578\u64da\u7684\u7d44\u7e54\u548c\u7d50\u69cb\u5c0d\u65bc\u6578\u64da\u7684\u67e5\u8a62\u548c\u5206\u6790\u81f3\u95dc\u91cd\u8981\u3002\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\uff0c\u5982\u4f55\u6709\u6548\u5730\u8f49\u63db\u6578\u64da\u683c\u5f0f\u6210\u70ba\u4e00\u500b\u91cd\u8981\u7684\u8ab2\u984c\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5728 SQL \u6578\u64da\u5eab\u4e2d\u5c07\u6a6b\u5411\u6578\u64da\u8f49\u63db\u70ba\u7e31\u5411\u5b57\u6bb5\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u3002<\/p>\n<h2 id=\"%e6%a9%ab%e5%90%91%e6%95%b8%e6%93%9a%e8%88%87%e7%b8%b1%e5%90%91%e6%95%b8%e6%93%9a%e7%9a%84%e5%ae%9a%e7%be%a9-PYuIueFifG\">\u6a6b\u5411\u6578\u64da\u8207\u7e31\u5411\u6578\u64da\u7684\u5b9a\u7fa9<\/h2>\n<p>\u6a6b\u5411\u6578\u64da\uff08\u4e5f\u7a31\u70ba\u5bec\u683c\u5f0f\u6578\u64da\uff09\u662f\u6307\u5728\u6578\u64da\u8868\u4e2d\uff0c\u6bcf\u4e00\u884c\u4ee3\u8868\u4e00\u500b\u5be6\u9ad4\uff0c\u800c\u6bcf\u4e00\u5217\u5247\u4ee3\u8868\u8a72\u5be6\u9ad4\u7684\u4e0d\u540c\u5c6c\u6027\u3002\u4f8b\u5982\uff0c\u8003\u616e\u4ee5\u4e0b\u7684\u5b78\u751f\u6210\u7e3e\u8868\uff1a<\/p>\n<pre>\n| \u5b78\u751fID | \u6578\u5b78 | \u82f1\u6587 | \u79d1\u5b78 |\n|--------|------|------|------|\n| 1      | 85   | 90   | 78   |\n| 2      | 88   | 92   | 80   |\n| 3      | 90   | 85   | 82   |\n<\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6bcf\u4e00\u884c\u4ee3\u8868\u4e00\u4f4d\u5b78\u751f\uff0c\u800c\u6bcf\u4e00\u5217\u4ee3\u8868\u8a72\u5b78\u751f\u5728\u4e0d\u540c\u79d1\u76ee\u4e2d\u7684\u6210\u7e3e\u3002<\/p>\n<p>\u76f8\u5c0d\u5730\uff0c\u7e31\u5411\u6578\u64da\uff08\u4e5f\u7a31\u70ba\u9577\u683c\u5f0f\u6578\u64da\uff09\u5247\u662f\u5c07\u6bcf\u500b\u5c6c\u6027\u5206\u958b\u6210\u70ba\u591a\u884c\u3002\u5c0d\u65bc\u4e0a\u8ff0\u7684\u5b78\u751f\u6210\u7e3e\u8868\uff0c\u7e31\u5411\u6578\u64da\u7684\u8868\u793a\u65b9\u5f0f\u5982\u4e0b\uff1a<\/p>\n<pre>\n| \u5b78\u751fID | \u79d1\u76ee | \u6210\u7e3e |\n|--------|------|------|\n| 1      | \u6578\u5b78 | 85   |\n| 1      | \u82f1\u6587 | 90   |\n| 1      | \u79d1\u5b78 | 78   |\n| 2      | \u6578\u5b78 | 88   |\n| 2      | \u82f1\u6587 | 92   |\n| 2      | \u79d1\u5b78 | 80   |\n| 3      | \u6578\u5b78 | 90   |\n| 3      | \u82f1\u6587 | 85   |\n| 3      | \u79d1\u5b78 | 82   |\n<\/pre>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e8%bd%89%e6%8f%9b%e6%95%b8%e6%93%9a%e6%a0%bc%e5%bc%8f-PYuIueFifG\">\u70ba\u4ec0\u9ebc\u9700\u8981\u8f49\u63db\u6578\u64da\u683c\u5f0f<\/h2>\n<p>\u5c07\u6a6b\u5411\u6578\u64da\u8f49\u63db\u70ba\u7e31\u5411\u6578\u64da\u6709\u52a9\u65bc\u6578\u64da\u5206\u6790\u548c\u5831\u544a\u751f\u6210\u3002\u8a31\u591a\u6578\u64da\u5206\u6790\u5de5\u5177\u548c\u6280\u8853\uff08\u5982\u6578\u64da\u900f\u8996\u8868\u548c\u7d71\u8a08\u5206\u6790\uff09\u66f4\u9069\u5408\u8655\u7406\u7e31\u5411\u6578\u64da\u3002\u6b64\u5916\uff0c\u7e31\u5411\u6578\u64da\u5728\u9032\u884c\u6578\u64da\u53ef\u8996\u5316\u6642\u4e5f\u66f4\u5177\u9748\u6d3b\u6027\u3002<\/p>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%9c%a8-sql-%e4%b8%ad%e9%80%b2%e8%a1%8c%e8%bd%89%e6%8f%9b-PYuIueFifG\">\u5982\u4f55\u5728 SQL \u4e2d\u9032\u884c\u8f49\u63db<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>UNPIVOT<\/code> \u64cd\u4f5c\u4f86\u5c07\u6a6b\u5411\u6578\u64da\u8f49\u63db\u70ba\u7e31\u5411\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u5c07\u4e0a\u8ff0\u5b78\u751f\u6210\u7e3e\u8868\u8f49\u63db\u70ba\u7e31\u5411\u683c\u5f0f\uff1a<\/p>\n<pre>\nSELECT \u5b78\u751fID, \u79d1\u76ee, \u6210\u7e3e\nFROM \n(\n    SELECT \u5b78\u751fID, \u6578\u5b78, \u82f1\u6587, \u79d1\u5b78\n    FROM \u5b78\u751f\u6210\u7e3e\n) AS \u6a6b\u5411\u6578\u64da\nUNPIVOT\n(\n    \u6210\u7e3e FOR \u79d1\u76ee IN (\u6578\u5b78, \u82f1\u6587, \u79d1\u5b78)\n) AS \u7e31\u5411\u6578\u64da;\n<\/pre>\n<p>\u5728\u9019\u6bb5 SQL \u4ee3\u78bc\u4e2d\uff0c\u6211\u5011\u9996\u5148\u9078\u64c7\u4e86\u6a6b\u5411\u6578\u64da\uff0c\u7136\u5f8c\u4f7f\u7528 <code>UNPIVOT<\/code> \u5c07\u6578\u64da\u8f49\u63db\u70ba\u7e31\u5411\u683c\u5f0f\u3002\u9019\u6a23\uff0c\u6211\u5011\u5c31\u80fd\u5920\u5f97\u5230\u6bcf\u4f4d\u5b78\u751f\u5728\u5404\u79d1\u76ee\u7684\u6210\u7e3e\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-PYuIueFifG\">\u7d50\u8ad6<\/h2>\n<p>\u5c07\u6a6b\u5411\u6578\u64da\u8f49\u63db\u70ba\u7e31\u5411\u5b57\u6bb5\u662f\u4e00\u500b\u91cd\u8981\u7684\u6578\u64da\u8655\u7406\u6280\u8853\uff0c\u80fd\u5920\u63d0\u9ad8\u6578\u64da\u5206\u6790\u7684\u6548\u7387\u548c\u9748\u6d3b\u6027\u3002\u901a\u904e\u4f7f\u7528 SQL \u7684 <code>UNPIVOT<\/code> \u64cd\u4f5c\uff0c\u6578\u64da\u5eab\u7ba1\u7406\u8005\u53ef\u4ee5\u8f15\u9b06\u5730\u9032\u884c\u9019\u4e00\u8f49\u63db\uff0c\u5f9e\u800c\u66f4\u597d\u5730\u652f\u6301\u696d\u52d9\u6c7a\u7b56\u548c\u6578\u64da\u5206\u6790\u9700\u6c42\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u6216\u5176\u4ed6\u76f8\u95dc\u6280\u8853\u6709\u8208\u8da3\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4e86\u89e3\u66f4\u591a\u8cc7\u8a0a\u3002\u6211\u5011\u63d0\u4f9b\u5404\u7a2e <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u5e6b\u52a9\u60a8\u66f4\u597d\u5730\u7ba1\u7406\u548c\u5206\u6790\u6578\u64da\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5c07SQL\u6578\u64da\u5eab\u4e2d\u7684\u6a6b\u5411\u6578\u64da\u8f49\u63db\u70ba\u7e31\u5411\u5b57\u6bb5\uff0c\u63d0\u5347\u6578\u64da\u5206\u6790\u6548\u7387\u8207\u9748\u6d3b\u6027\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-143993","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143993","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=143993"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143993\/revisions"}],"predecessor-version":[{"id":143994,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/143993\/revisions\/143994"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=143993"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=143993"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=143993"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}