{"id":153777,"date":"2024-11-02T10:16:18","date_gmt":"2024-11-02T02:16:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/153777\/"},"modified":"2024-11-02T10:16:19","modified_gmt":"2024-11-02T02:16:19","slug":"%e5%b8%b6%e6%82%a8%e4%ba%86%e8%a7%a3%e4%bb%80%e9%ba%bc%e6%98%afsql%e8%81%af%e5%90%88%e6%9f%a5%e8%a9%a2","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/153777\/","title":{"rendered":"\u5e36\u60a8\u4e86\u89e3\u4ec0\u9ebc\u662fSQL\u806f\u5408\u67e5\u8a62"},"content":{"rendered":"<h1 id=\"%e5%b8%b6%e6%82%a8%e4%ba%86%e8%a7%a3%e4%bb%80%e9%ba%bc%e6%98%afsql%e8%81%af%e5%90%88%e6%9f%a5%e8%a9%a2-wInbMNRqeR\">\u5e36\u60a8\u4e86\u89e3\u4ec0\u9ebc\u662fSQL\u806f\u5408\u67e5\u8a62<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u4e00\u7a2e\u7528\u65bc\u67e5\u8a62\u548c\u64cd\u4f5c\u6578\u64da\u7684\u6a19\u6e96\u8a9e\u8a00\u3002\u7576\u6211\u5011\u9700\u8981\u5f9e\u591a\u500b\u8868\u4e2d\u63d0\u53d6\u6578\u64da\u6642\uff0c\u806f\u5408\u67e5\u8a62\uff08UNION\uff09\u662f\u4e00\u500b\u975e\u5e38\u6709\u7528\u7684\u5de5\u5177\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eSQL\u806f\u5408\u67e5\u8a62\u7684\u6982\u5ff5\u3001\u7528\u6cd5\u53ca\u5176\u5be6\u969b\u61c9\u7528\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afsql%e8%81%af%e5%90%88%e6%9f%a5%e8%a9%a2%ef%bc%9f-wInbMNRqeR\">\u4ec0\u9ebc\u662fSQL\u806f\u5408\u67e5\u8a62\uff1f<\/h2>\n<p>SQL\u806f\u5408\u67e5\u8a62\u662f\u4e00\u7a2e\u5c07\u5169\u500b\u6216\u591a\u500bSELECT\u67e5\u8a62\u7684\u7d50\u679c\u5408\u4f75\u70ba\u4e00\u500b\u7d50\u679c\u96c6\u7684\u64cd\u4f5c\u3002\u9019\u4e9b\u67e5\u8a62\u5fc5\u9808\u5177\u6709\u76f8\u540c\u7684\u5217\u6578\u548c\u76f8\u4f3c\u7684\u6578\u64da\u985e\u578b\u3002\u806f\u5408\u67e5\u8a62\u7684\u4e3b\u8981\u76ee\u7684\u662f\u5f9e\u4e0d\u540c\u7684\u8868\u4e2d\u63d0\u53d6\u76f8\u95dc\u6578\u64da\uff0c\u4e26\u5c07\u5176\u6574\u5408\u5728\u4e00\u8d77\uff0c\u4ee5\u4fbf\u9032\u884c\u66f4\u5168\u9762\u7684\u5206\u6790\u3002<\/p>\n<h2 id=\"%e8%81%af%e5%90%88%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-wInbMNRqeR\">\u806f\u5408\u67e5\u8a62\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>\u806f\u5408\u67e5\u8a62\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT column1, column2, ...\nFROM table1\nWHERE condition1\nUNION\nSELECT column1, column2, ...\nFROM table2\nWHERE condition2;<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0cUNION\u95dc\u9375\u5b57\u7528\u65bc\u5c07\u5169\u500bSELECT\u67e5\u8a62\u7684\u7d50\u679c\u5408\u4f75\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cUNION\u6703\u81ea\u52d5\u53bb\u9664\u91cd\u8907\u7684\u8a18\u9304\u3002\u5982\u679c\u5e0c\u671b\u4fdd\u7559\u6240\u6709\u8a18\u9304\uff0c\u5305\u62ec\u91cd\u8907\u7684\uff0c\u53ef\u4ee5\u4f7f\u7528UNION ALL\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8union%e7%9a%84%e7%a4%ba%e4%be%8b-wInbMNRqeR\">\u4f7f\u7528UNION\u7684\u793a\u4f8b<\/h2>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u5169\u500b\u8868\uff1a<strong>customers<\/strong>\u548c<strong>suppliers<\/strong>\uff0c\u5b83\u5011\u90fd\u5305\u542b\u57ce\u5e02\uff08city\uff09\u548c\u570b\u5bb6\uff08country\uff09\u4fe1\u606f\u3002\u6211\u5011\u5e0c\u671b\u5f9e\u9019\u5169\u500b\u8868\u4e2d\u63d0\u53d6\u6240\u6709\u4f86\u81ea\u201c\u9999\u6e2f\u201d\u7684\u5ba2\u6236\u548c\u4f9b\u61c9\u5546\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT city, country\nFROM customers\nWHERE city = '\u9999\u6e2f'\nUNION\nSELECT city, country\nFROM suppliers\nWHERE city = '\u9999\u6e2f';<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u6240\u6709\u4f86\u81ea\u9999\u6e2f\u7684\u5ba2\u6236\u548c\u4f9b\u61c9\u5546\u7684\u57ce\u5e02\u548c\u570b\u5bb6\u4fe1\u606f\uff0c\u4e26\u4e14\u4e0d\u6703\u6709\u91cd\u8907\u7684\u8a18\u9304\u3002<\/p>\n<h2 id=\"%e8%81%af%e5%90%88%e6%9f%a5%e8%a9%a2%e7%9a%84%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-wInbMNRqeR\">\u806f\u5408\u67e5\u8a62\u7684\u6ce8\u610f\u4e8b\u9805<\/h2>\n<ul>\n<li><strong>\u5217\u6578\u548c\u6578\u64da\u985e\u578b\uff1a<\/strong>\u6240\u6709\u806f\u5408\u7684SELECT\u67e5\u8a62\u5fc5\u9808\u8fd4\u56de\u76f8\u540c\u6578\u91cf\u7684\u5217\uff0c\u4e26\u4e14\u5c0d\u61c9\u5217\u7684\u6578\u64da\u985e\u578b\u5fc5\u9808\u76f8\u4f3c\u3002<\/li>\n<li><strong>\u6392\u5e8f\uff1a<\/strong>\u5982\u679c\u9700\u8981\u5c0d\u6700\u7d42\u7d50\u679c\u9032\u884c\u6392\u5e8f\uff0c\u53ef\u4ee5\u5728\u6700\u5f8c\u4e00\u500bSELECT\u67e5\u8a62\u5f8c\u4f7f\u7528ORDER BY\u8a9e\u53e5\u3002<\/li>\n<li><strong>\u6027\u80fd\u8003\u91cf\uff1a<\/strong>\u4f7f\u7528\u806f\u5408\u67e5\u8a62\u6642\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\uff0c\u53ef\u80fd\u6703\u5f71\u97ff\u67e5\u8a62\u6027\u80fd\uff0c\u56e0\u6b64\u61c9\u8b39\u614e\u4f7f\u7528\u3002<\/li>\n<\/ul>\n<h2 id=\"%e8%81%af%e5%90%88%e6%9f%a5%e8%a9%a2%e7%9a%84%e5%af%a6%e9%9a%9b%e6%87%89%e7%94%a8-wInbMNRqeR\">\u806f\u5408\u67e5\u8a62\u7684\u5be6\u969b\u61c9\u7528<\/h2>\n<p>\u806f\u5408\u67e5\u8a62\u5728\u8a31\u591a\u5be6\u969b\u61c9\u7528\u4e2d\u90fd\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff0c\u5728\u4e00\u500b\u96fb\u5b50\u5546\u52d9\u5e73\u53f0\u4e2d\uff0c\u53ef\u80fd\u9700\u8981\u5f9e\u4e0d\u540c\u7684\u6578\u64da\u8868\u4e2d\u63d0\u53d6\u5ba2\u6236\u548c\u4f9b\u61c9\u5546\u7684\u806f\u7e6b\u4fe1\u606f\uff0c\u4ee5\u4fbf\u9032\u884c\u5e02\u5834\u5206\u6790\u6216\u5ba2\u6236\u95dc\u4fc2\u7ba1\u7406\u3002\u6b64\u5916\uff0c\u806f\u5408\u67e5\u8a62\u9084\u53ef\u4ee5\u7528\u65bc\u5831\u544a\u751f\u6210\uff0c\u5e6b\u52a9\u4f01\u696d\u6574\u5408\u4f86\u81ea\u4e0d\u540c\u4f86\u6e90\u7684\u6578\u64da\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-wInbMNRqeR\">\u7e3d\u7d50<\/h2>\n<p>SQL\u806f\u5408\u67e5\u8a62\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5f9e\u591a\u500b\u8868\u4e2d\u63d0\u53d6\u548c\u6574\u5408\u6578\u64da\u3002\u901a\u904e\u6b63\u78ba\u4f7f\u7528UNION\u548cUNION ALL\uff0c\u6578\u64da\u5206\u6790\u5e2b\u548c\u958b\u767c\u8005\u53ef\u4ee5\u66f4\u6709\u6548\u5730\u9032\u884c\u6578\u64da\u67e5\u8a62\u548c\u5831\u544a\u751f\u6210\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u81f3\u95dc\u91cd\u8981\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u670d\u52d9\uff0cServer.HK\u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3SQL\u806f\u5408\u67e5\u8a62\u7684\u57fa\u672c\u6982\u5ff5\uff0c\u5b78\u7fd2\u5982\u4f55\u5c07\u591a\u500b\u67e5\u8a62\u7d50\u679c\u5408\u4f75\uff0c\u63d0\u5347\u6578\u64da\u5206\u6790\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-153777","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/153777","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=153777"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/153777\/revisions"}],"predecessor-version":[{"id":153778,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/153777\/revisions\/153778"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=153777"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=153777"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=153777"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}