{"id":183314,"date":"2024-11-10T03:47:18","date_gmt":"2024-11-09T19:47:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/183314\/"},"modified":"2024-11-10T03:47:18","modified_gmt":"2024-11-09T19:47:18","slug":"%e5%af%a6%e7%8f%be%e8%b7%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a8%aa%e5%95%8f%e8%a1%a8%e7%9a%84-sql%e6%8a%80%e5%b7%a7-%e8%b7%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a8%aa%e5%95%8f%e8%a1%a8-sql","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/183314\/","title":{"rendered":"\u5be6\u73fe\u8de8\u6578\u64da\u5eab\u8a2a\u554f\u8868\u7684 SQL\u6280\u5de7 (\u8de8\u6578\u64da\u5eab\u8a2a\u554f\u8868 sql)"},"content":{"rendered":"<h1 id=\"%e5%af%a6%e7%8f%be%e8%b7%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a8%aa%e5%95%8f%e8%a1%a8%e7%9a%84-sql%e6%8a%80%e5%b7%a7-btaXEsUPfD\">\u5be6\u73fe\u8de8\u6578\u64da\u5eab\u8a2a\u554f\u8868\u7684 SQL\u6280\u5de7<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u9a45\u52d5\u6642\u4ee3\uff0c\u8de8\u6578\u64da\u5eab\u8a2a\u554f\u8868\u7684\u9700\u6c42\u65e5\u76ca\u589e\u52a0\u3002\u7121\u8ad6\u662f\u4f01\u696d\u9700\u8981\u6574\u5408\u4f86\u81ea\u4e0d\u540c\u6578\u64da\u5eab\u7684\u6578\u64da\uff0c\u9084\u662f\u958b\u767c\u8005\u5e0c\u671b\u5728\u591a\u500b\u6578\u64da\u6e90\u4e4b\u9593\u9032\u884c\u67e5\u8a62\uff0c\u638c\u63e1\u8de8\u6578\u64da\u5eab\u7684 SQL \u6280\u5de7\u90fd\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u6709\u6548\u5730\u5be6\u73fe\u8de8\u6578\u64da\u5eab\u8a2a\u554f\u8868\u7684 SQL \u6280\u5de7\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u793a\u4f8b\u548c\u5efa\u8b70\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e8%b7%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a8%aa%e5%95%8f%ef%bc%9f-btaXEsUPfD\">\u4ec0\u9ebc\u662f\u8de8\u6578\u64da\u5eab\u8a2a\u554f\uff1f<\/h2>\n<p>\u8de8\u6578\u64da\u5eab\u8a2a\u554f\u662f\u6307\u5728\u4e00\u500b\u6578\u64da\u5eab\u4e2d\u67e5\u8a62\u6216\u64cd\u4f5c\u53e6\u4e00\u500b\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\u3002\u9019\u7a2e\u6280\u8853\u901a\u5e38\u7528\u65bc\u9700\u8981\u6574\u5408\u591a\u500b\u6578\u64da\u6e90\u7684\u60c5\u6cc1\uff0c\u4f8b\u5982\u5728\u4e0d\u540c\u7684\u61c9\u7528\u7a0b\u5e8f\u6216\u670d\u52d9\u4e4b\u9593\u5171\u4eab\u6578\u64da\u3002\u8de8\u6578\u64da\u5eab\u8a2a\u554f\u53ef\u4ee5\u63d0\u9ad8\u6578\u64da\u7684\u53ef\u7528\u6027\u548c\u4e00\u81f4\u6027\uff0c\u4e26\u4f7f\u5f97\u6578\u64da\u5206\u6790\u548c\u5831\u544a\u8b8a\u5f97\u66f4\u52a0\u9ad8\u6548\u3002<\/p>\n<h2 id=\"%e8%b7%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e8%a8%aa%e5%95%8f%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-btaXEsUPfD\">\u8de8\u6578\u64da\u5eab\u8a2a\u554f\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u8de8\u6578\u64da\u5eab\u8a2a\u554f\u7684\u57fa\u672c\u8a9e\u6cd5\u901a\u5e38\u6d89\u53ca\u5230\u6578\u64da\u5eab\u540d\u7a31\u3001\u8868\u540d\u7a31\u548c\u5217\u540d\u7a31\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684 SQL \u8a9e\u6cd5\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT * FROM database_name.table_name;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c<code>database_name<\/code> \u662f\u4f60\u8981\u8a2a\u554f\u7684\u6578\u64da\u5eab\u540d\u7a31\uff0c\u800c <code>table_name<\/code> \u662f\u4f60\u8981\u67e5\u8a62\u7684\u8868\u540d\u7a31\u3002\u9019\u7a2e\u8a9e\u6cd5\u9069\u7528\u65bc\u5927\u591a\u6578\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff08RDBMS\uff09\uff0c\u5982 MySQL\u3001PostgreSQL \u548c SQL Server\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8-join-%e9%80%b2%e8%a1%8c%e8%b7%a8%e6%95%b8%e6%93%9a%e5%ba%ab%e6%9f%a5%e8%a9%a2-btaXEsUPfD\">\u4f7f\u7528 JOIN \u9032\u884c\u8de8\u6578\u64da\u5eab\u67e5\u8a62<\/h2>\n<p>\u5728\u9032\u884c\u8de8\u6578\u64da\u5eab\u67e5\u8a62\u6642\uff0c\u4f7f\u7528 <code>JOIN<\/code> \u8a9e\u53e5\u53ef\u4ee5\u6709\u6548\u5730\u6574\u5408\u4f86\u81ea\u4e0d\u540c\u6578\u64da\u5eab\u7684\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528 <code>JOIN<\/code> \u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT a.column1, b.column2\nFROM database1.table1 AS a\nJOIN database2.table2 AS b ON a.id = b.foreign_id;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5f9e <code>database1<\/code> \u7684 <code>table1<\/code> \u548c <code>database2<\/code> \u7684 <code>table2<\/code> \u4e2d\u9078\u64c7\u6578\u64da\uff0c\u4e26\u901a\u904e <code>id<\/code> \u548c <code>foreign_id<\/code> \u9032\u884c\u9023\u63a5\u3002\u9019\u6a23\u53ef\u4ee5\u5728\u4e00\u500b\u67e5\u8a62\u4e2d\u7372\u53d6\u4f86\u81ea\u4e0d\u540c\u6578\u64da\u5eab\u7684\u76f8\u95dc\u6578\u64da\u3002<\/p>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-btaXEsUPfD\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u9032\u884c\u8de8\u6578\u64da\u5eab\u8a2a\u554f\u6642\uff0c\u6709\u5e7e\u500b\u6ce8\u610f\u4e8b\u9805\u9700\u8981\u8003\u616e\uff1a<\/p>\n<ul>\n<li><strong>\u6b0a\u9650\u7ba1\u7406\uff1a<\/strong>\u78ba\u4fdd\u7528\u6236\u64c1\u6709\u8a2a\u554f\u6240\u6709\u76f8\u95dc\u6578\u64da\u5eab\u7684\u6b0a\u9650\u3002<\/li>\n<li><strong>\u6027\u80fd\u8003\u91cf\uff1a<\/strong>\u8de8\u6578\u64da\u5eab\u67e5\u8a62\u53ef\u80fd\u6703\u5f71\u97ff\u6027\u80fd\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002\u5efa\u8b70\u5c0d\u67e5\u8a62\u9032\u884c\u512a\u5316\u3002<\/li>\n<li><strong>\u6578\u64da\u4e00\u81f4\u6027\uff1a<\/strong>\u78ba\u4fdd\u4e0d\u540c\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\u7d50\u69cb\u548c\u985e\u578b\u4e00\u81f4\uff0c\u4ee5\u907f\u514d\u67e5\u8a62\u932f\u8aa4\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-btaXEsUPfD\">\u7d50\u8ad6<\/h2>\n<p>\u8de8\u6578\u64da\u5eab\u8a2a\u554f\u8868\u7684 SQL \u6280\u5de7\u5c0d\u65bc\u6578\u64da\u6574\u5408\u548c\u5206\u6790\u81f3\u95dc\u91cd\u8981\u3002\u901a\u904e\u638c\u63e1\u57fa\u672c\u8a9e\u6cd5\u548c\u4f7f\u7528 <code>JOIN<\/code> \u8a9e\u53e5\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u6709\u6548\u5730\u5f9e\u591a\u500b\u6578\u64da\u5eab\u4e2d\u63d0\u53d6\u548c\u6574\u5408\u6578\u64da\u3002\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u6ce8\u610f\u6b0a\u9650\u7ba1\u7406\u3001\u6027\u80fd\u8003\u91cf\u548c\u6578\u64da\u4e00\u81f4\u6027\u5c07\u6709\u52a9\u65bc\u63d0\u9ad8\u67e5\u8a62\u7684\u6548\u7387\u548c\u6e96\u78ba\u6027\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\u8a2a\u554f\u60a8\u7684\u6578\u64da\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22\u5be6\u73fe\u8de8\u6578\u64da\u5eab\u8a2a\u554f\u8868\u7684 SQL \u6280\u5de7\uff0c\u63d0\u5347\u6578\u64da\u6574\u5408\u6548\u7387\uff0c\u7c21\u5316\u67e5\u8a62\u904e\u7a0b\uff0c\u52a9\u529b\u6578\u64da\u5206\u6790\u8207\u7ba1\u7406\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-183314","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/183314","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=183314"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/183314\/revisions"}],"predecessor-version":[{"id":183315,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/183314\/revisions\/183315"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=183314"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=183314"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=183314"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}