{"id":172837,"date":"2024-11-07T15:29:19","date_gmt":"2024-11-07T07:29:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/172837\/"},"modified":"2024-11-07T15:29:20","modified_gmt":"2024-11-07T07:29:20","slug":"%e5%a6%82%e4%bd%95%e6%9f%a5%e6%89%be%e4%b8%8d%e5%90%8c%e7%9a%84%e6%95%b8%e6%93%9a%e5%ba%ab%e5%88%97-%e6%80%8e%e6%a8%a3%e6%89%be%e5%87%ba%e5%85%a9%e5%80%8b%e5%88%97%e4%b8%ad%e4%b8%8d%e5%90%8c%e7%9a%84","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/172837\/","title":{"rendered":"\u5982\u4f55\u67e5\u627e\u4e0d\u540c\u7684\u6578\u64da\u5eab\u5217 (\u600e\u6a23\u627e\u51fa\u5169\u500b\u5217\u4e2d\u4e0d\u540c\u7684\u6578\u64da\u5eab)"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e6%9f%a5%e6%89%be%e4%b8%8d%e5%90%8c%e7%9a%84%e6%95%b8%e6%93%9a%e5%ba%ab%e5%88%97-%e6%80%8e%e6%a8%a3%e6%89%be%e5%87%ba%e5%85%a9%e5%80%8b%e5%88%97%e4%b8%ad%e4%b8%8d%e5%90%8c%e7%9a%84-MZHKJHhuNY\">\u5982\u4f55\u67e5\u627e\u4e0d\u540c\u7684\u6578\u64da\u5eab\u5217 (\u600e\u6a23\u627e\u51fa\u5169\u500b\u5217\u4e2d\u4e0d\u540c\u7684\u6578\u64da\u5eab)<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u7d93\u5e38\u9700\u8981\u6bd4\u8f03\u5169\u500b\u5217\u4e4b\u9593\u7684\u6578\u64da\uff0c\u4ee5\u627e\u51fa\u5b83\u5011\u4e4b\u9593\u7684\u5dee\u7570\u3002\u9019\u5728\u6578\u64da\u6e05\u7406\u3001\u6578\u64da\u9077\u79fb\u6216\u6578\u64da\u5206\u6790\u7684\u904e\u7a0b\u4e2d\u5c24\u70ba\u91cd\u8981\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5e7e\u7a2e\u67e5\u627e\u4e0d\u540c\u6578\u64da\u5eab\u5217\u7684\u65b9\u6cd5\uff0c\u4e26\u63d0\u4f9b\u76f8\u61c9\u7684 SQL \u67e5\u8a62\u793a\u4f8b\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8-sql-%e6%9f%a5%e8%a9%a2%e6%af%94%e8%bc%83%e5%85%a9%e5%80%8b%e5%88%97-MZHKJHhuNY\">\u4f7f\u7528 SQL \u67e5\u8a62\u6bd4\u8f03\u5169\u500b\u5217<\/h2>\n<p>\u6700\u5e38\u898b\u7684\u65b9\u6cd5\u662f\u4f7f\u7528 SQL \u67e5\u8a62\u4f86\u6bd4\u8f03\u5169\u500b\u5217\u3002\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>employees<\/code> \u7684\u8868\uff0c\u8a72\u8868\u4e2d\u6709\u5169\u500b\u5217 <code>email_old<\/code> \u548c <code>email_new<\/code>\uff0c\u6211\u5011\u5e0c\u671b\u627e\u51fa\u9019\u5169\u500b\u5217\u4e2d\u4e0d\u540c\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u3002<\/p>\n<pre><code>SELECT email_old, email_new\nFROM employees\nWHERE email_old  email_new;\n<\/code><\/pre>\n<p>\u4e0a\u8ff0\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709 <code>email_old<\/code> \u548c <code>email_new<\/code> \u5217\u4e2d\u4e0d\u76f8\u540c\u7684\u8a18\u9304\u3002\u9019\u662f\u4e00\u500b\u7c21\u55ae\u800c\u6709\u6548\u7684\u65b9\u6cd5\uff0c\u9069\u7528\u65bc\u5c0f\u578b\u6578\u64da\u96c6\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8-join-%e4%be%86%e6%af%94%e8%bc%83%e5%85%a9%e5%80%8b%e8%a1%a8-MZHKJHhuNY\">\u4f7f\u7528 JOIN \u4f86\u6bd4\u8f03\u5169\u500b\u8868<\/h2>\n<p>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u60a8\u53ef\u80fd\u9700\u8981\u6bd4\u8f03\u5169\u500b\u4e0d\u540c\u7684\u8868\u4e2d\u7684\u5217\u3002\u5047\u8a2d\u6211\u5011\u6709\u5169\u500b\u8868 <code>employees_2022<\/code> \u548c <code>employees_2023<\/code>\uff0c\u6211\u5011\u60f3\u627e\u51fa\u5728 2022 \u5e74\u548c 2023 \u5e74\u4e4b\u9593\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u7684\u8b8a\u5316\u3002<\/p>\n<pre><code>SELECT e22.email AS email_2022, e23.email AS email_2023\nFROM employees_2022 e22\nJOIN employees_2023 e23 ON e22.id = e23.id\nWHERE e22.email  e23.email;\n<\/code><\/pre>\n<p>\u9019\u6bb5\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u5728 2022 \u5e74\u548c 2023 \u5e74\u4e4b\u9593\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u4e0d\u540c\u7684\u54e1\u5de5\u8a18\u9304\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8-except-%e6%88%96-minus-%e4%be%86%e6%89%be%e5%87%ba%e5%b7%ae%e7%95%b0-MZHKJHhuNY\">\u4f7f\u7528 EXCEPT \u6216 MINUS \u4f86\u627e\u51fa\u5dee\u7570<\/h2>\n<p>\u5728\u67d0\u4e9b\u6578\u64da\u5eab\u7cfb\u7d71\u4e2d\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528 <code>EXCEPT<\/code> \u6216 <code>MINUS<\/code> \u4f86\u627e\u51fa\u5169\u500b\u5217\u4e4b\u9593\u7684\u5dee\u7570\u3002\u9019\u4e9b\u95dc\u9375\u5b57\u53ef\u4ee5\u5e6b\u52a9\u60a8\u7372\u53d6\u5728\u4e00\u500b\u5217\u4e2d\u5b58\u5728\u4f46\u5728\u53e6\u4e00\u500b\u5217\u4e2d\u4e0d\u5b58\u5728\u7684\u6578\u64da\u3002<\/p>\n<pre><code>SELECT email_old\nFROM employees\nEXCEPT\nSELECT email_new\nFROM employees;\n<\/code><\/pre>\n<p>\u9019\u6bb5\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u5728 <code>email_old<\/code> \u5217\u4e2d\u5b58\u5728\u4f46\u5728 <code>email_new<\/code> \u5217\u4e2d\u4e0d\u5b58\u5728\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e7%ae%a1%e7%90%86%e5%b7%a5%e5%85%b7-MZHKJHhuNY\">\u4f7f\u7528\u6578\u64da\u5eab\u7ba1\u7406\u5de5\u5177<\/h2>\n<p>\u9664\u4e86\u4f7f\u7528 SQL \u67e5\u8a62\uff0c\u9084\u53ef\u4ee5\u5229\u7528\u4e00\u4e9b\u6578\u64da\u5eab\u7ba1\u7406\u5de5\u5177\u4f86\u6bd4\u8f03\u6578\u64da\u3002\u4f8b\u5982\uff0c\u8a31\u591a\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff08\u5982 MySQL Workbench\u3001SQL Server Management Studio \u7b49\uff09\u63d0\u4f9b\u4e86\u53ef\u8996\u5316\u7684\u6bd4\u8f03\u5de5\u5177\uff0c\u9019\u4e9b\u5de5\u5177\u53ef\u4ee5\u5e6b\u52a9\u7528\u6236\u66f4\u76f4\u89c0\u5730\u67e5\u770b\u6578\u64da\u4e4b\u9593\u7684\u5dee\u7570\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-MZHKJHhuNY\">\u7d50\u8ad6<\/h2>\n<p>\u67e5\u627e\u4e0d\u540c\u7684\u6578\u64da\u5eab\u5217\u662f\u4e00\u9805\u91cd\u8981\u7684\u4efb\u52d9\uff0c\u7121\u8ad6\u662f\u5728\u6578\u64da\u6e05\u7406\u3001\u6578\u64da\u9077\u79fb\u9084\u662f\u6578\u64da\u5206\u6790\u4e2d\u3002\u901a\u904e\u4f7f\u7528 SQL \u67e5\u8a62\u3001JOIN \u64cd\u4f5c\u3001EXCEPT \u6216 MINUS \u95dc\u9375\u5b57\uff0c\u60a8\u53ef\u4ee5\u6709\u6548\u5730\u627e\u51fa\u5169\u500b\u5217\u4e4b\u9593\u7684\u5dee\u7570\u3002\u6b64\u5916\uff0c\u5229\u7528\u6578\u64da\u5eab\u7ba1\u7406\u5de5\u5177\u4e5f\u80fd\u63d0\u9ad8\u6548\u7387\u548c\u6e96\u78ba\u6027\u3002<\/p>\n<p>\u5982\u679c\u60a8\u9700\u8981\u66f4\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\u548c\u7ba1\u7406\uff0c\u8003\u616e\u4f7f\u7528 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u670d\u52d9\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u6578\u64da\u5eab\u64cd\u4f5c\u63d0\u4f9b\u66f4\u5f37\u5927\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u67e5\u627e\u5169\u500b\u6578\u64da\u5eab\u5217\u4e4b\u9593\u7684\u4e0d\u540c\u6578\u64da\uff0c\u638c\u63e1\u6709\u6548\u7684\u67e5\u8a62\u6280\u5de7\u548c\u65b9\u6cd5\uff0c\u63d0\u5347\u6578\u64da\u5206\u6790\u80fd\u529b\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-172837","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172837","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=172837"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172837\/revisions"}],"predecessor-version":[{"id":172838,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172837\/revisions\/172838"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=172837"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=172837"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=172837"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}