{"id":143955,"date":"2024-11-01T02:39:17","date_gmt":"2024-10-31T18:39:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/143955\/"},"modified":"2024-11-01T02:39:18","modified_gmt":"2024-10-31T18:39:18","slug":"sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e5%88%a5%e5%90%8d%e5%8a%9f%e8%83%bd%e7%b0%a1%e8%bf%b0-sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e5%88%a5%e5%90%8d","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/143955\/","title":{"rendered":"SQL \u6578\u64da\u5eab\u7684\u5225\u540d\u529f\u80fd\u7c21\u8ff0 (sql \u6578\u64da\u5eab\u5225\u540d)"},"content":{"rendered":"<h1 id=\"sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e5%88%a5%e5%90%8d%e5%8a%9f%e8%83%bd%e7%b0%a1%e8%bf%b0-sql-%e6%95%b8%e6%93%9a%e5%ba%ab%e5%88%a5%e5%90%8d-yMNsqeujgr\">SQL \u6578\u64da\u5eab\u7684\u5225\u540d\u529f\u80fd\u7c21\u8ff0 (SQL \u6578\u64da\u5eab\u5225\u540d)<\/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\u5ee3\u6cdb\u4f7f\u7528\u7684\u8a9e\u8a00\uff0c\u7528\u65bc\u67e5\u8a62\u548c\u64cd\u4f5c\u6578\u64da\u3002SQL \u63d0\u4f9b\u4e86\u591a\u7a2e\u529f\u80fd\u4f86\u7c21\u5316\u6578\u64da\u64cd\u4f5c\uff0c\u5176\u4e2d\u4e4b\u4e00\u5c31\u662f\u5225\u540d\u529f\u80fd\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e SQL \u6578\u64da\u5eab\u7684\u5225\u540d\u529f\u80fd\uff0c\u5305\u62ec\u5176\u7528\u9014\u3001\u512a\u52e2\u4ee5\u53ca\u5982\u4f55\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528\u5225\u540d\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-sql-%e5%88%a5%e5%90%8d%ef%bc%9f-yMNsqeujgr\">\u4ec0\u9ebc\u662f SQL \u5225\u540d\uff1f<\/h2>\n<p>SQL \u5225\u540d\u662f\u4e00\u7a2e\u70ba\u8868\u6216\u5217\u6307\u5b9a\u81e8\u6642\u540d\u7a31\u7684\u529f\u80fd\u3002\u9019\u4e9b\u5225\u540d\u5728\u67e5\u8a62\u57f7\u884c\u671f\u9593\u6709\u6548\uff0c\u4e26\u4e0d\u6703\u6539\u8b8a\u6578\u64da\u5eab\u4e2d\u7684\u5be6\u969b\u7d50\u69cb\u3002\u4f7f\u7528\u5225\u540d\u53ef\u4ee5\u4f7f\u67e5\u8a62\u7d50\u679c\u66f4\u5177\u53ef\u8b80\u6027\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u8907\u96dc\u67e5\u8a62\u6642\u3002<\/p>\n<h2 id=\"%e5%88%a5%e5%90%8d%e7%9a%84%e7%94%a8%e9%80%94-yMNsqeujgr\">\u5225\u540d\u7684\u7528\u9014<\/h2>\n<ul>\n<li><strong>\u63d0\u9ad8\u53ef\u8b80\u6027\uff1a<\/strong>\u4f7f\u7528\u5225\u540d\u53ef\u4ee5\u4f7f\u67e5\u8a62\u7d50\u679c\u66f4\u6613\u65bc\u7406\u89e3\u3002\u4f8b\u5982\uff0c\u7576\u67e5\u8a62\u7684\u5217\u540d\u904e\u9577\u6216\u4e0d\u5920\u76f4\u89c0\u6642\uff0c\u5225\u540d\u53ef\u4ee5\u63d0\u4f9b\u66f4\u6e05\u6670\u7684\u63cf\u8ff0\u3002<\/li>\n<li><strong>\u7c21\u5316\u67e5\u8a62\uff1a<\/strong>\u5728\u591a\u8868\u806f\u63a5\u7684\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528\u5225\u540d\u53ef\u4ee5\u7c21\u5316 SQL \u8a9e\u53e5\uff0c\u6e1b\u5c11\u91cd\u8907\u7684\u8868\u540d\u3002<\/li>\n<li><strong>\u907f\u514d\u547d\u540d\u885d\u7a81\uff1a<\/strong>\u5728\u67e5\u8a62\u4e2d\u4f7f\u7528\u76f8\u540c\u7684\u5217\u540d\u6642\uff0c\u5225\u540d\u53ef\u4ee5\u5e6b\u52a9\u5340\u5206\u4e0d\u540c\u8868\u4e2d\u7684\u76f8\u540c\u5217\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8-sql-%e5%88%a5%e5%90%8d-yMNsqeujgr\">\u5982\u4f55\u4f7f\u7528 SQL \u5225\u540d<\/h2>\n<p>\u5728 SQL \u4e2d\uff0c\u5225\u540d\u7684\u4f7f\u7528\u975e\u5e38\u7c21\u55ae\u3002\u53ef\u4ee5\u4f7f\u7528\u95dc\u9375\u5b57 <code>AS<\/code> \u4f86\u5b9a\u7fa9\u5225\u540d\uff0c\u4f46\u9019\u662f\u53ef\u9078\u7684\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u4f7f\u7528\u5225\u540d\u7684\u7bc4\u4f8b\uff1a<\/p>\n<h3 id=\"%e7%82%ba%e5%88%97%e6%8c%87%e5%ae%9a%e5%88%a5%e5%90%8d-yMNsqeujgr\">\u70ba\u5217\u6307\u5b9a\u5225\u540d<\/h3>\n<pre><code>SELECT first_name AS \"\u540d\u5b57\", last_name AS \"\u59d3\u6c0f\"\nFROM employees;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c<code>first_name<\/code> \u548c <code>last_name<\/code> \u5217\u88ab\u5206\u5225\u6307\u5b9a\u70ba\u201c\u540d\u5b57\u201d\u548c\u201c\u59d3\u6c0f\u201d\u3002\u9019\u6a23\uff0c\u67e5\u8a62\u7d50\u679c\u4e2d\u7684\u5217\u6a19\u984c\u5c07\u66f4\u5177\u53ef\u8b80\u6027\u3002<\/p>\n<h3 id=\"%e7%82%ba%e8%a1%a8%e6%8c%87%e5%ae%9a%e5%88%a5%e5%90%8d-yMNsqeujgr\">\u70ba\u8868\u6307\u5b9a\u5225\u540d<\/h3>\n<pre><code>SELECT e.first_name, e.last_name\nFROM employees AS e\nJOIN departments AS d ON e.department_id = d.id;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c<code>employees<\/code> \u8868\u88ab\u6307\u5b9a\u70ba <code>e<\/code>\uff0c\u800c <code>departments<\/code> \u8868\u88ab\u6307\u5b9a\u70ba <code>d<\/code>\u3002\u9019\u6a23\u53ef\u4ee5\u7c21\u5316\u67e5\u8a62\uff0c\u7279\u5225\u662f\u5728\u6d89\u53ca\u591a\u500b\u8868\u7684\u60c5\u6cc1\u4e0b\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e5%88%a5%e5%90%8d%e7%9a%84%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-yMNsqeujgr\">\u4f7f\u7528\u5225\u540d\u7684\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u96d6\u7136\u4f7f\u7528\u5225\u540d\u6709\u5f88\u591a\u512a\u52e2\uff0c\u4f46\u5728\u4f7f\u7528\u6642\u4e5f\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li>\u5225\u540d\u50c5\u5728\u67e5\u8a62\u57f7\u884c\u671f\u9593\u6709\u6548\uff0c\u4e26\u4e0d\u6703\u5f71\u97ff\u6578\u64da\u5eab\u7684\u7d50\u69cb\u3002<\/li>\n<li>\u5728\u4f7f\u7528\u5225\u540d\u6642\uff0c\u61c9\u907f\u514d\u4f7f\u7528 SQL \u4fdd\u7559\u5b57\u4f5c\u70ba\u5225\u540d\uff0c\u4ee5\u514d\u5f15\u8d77\u8a9e\u6cd5\u932f\u8aa4\u3002<\/li>\n<li>\u5728\u67d0\u4e9b\u6578\u64da\u5eab\u7cfb\u7d71\u4e2d\uff0c\u5225\u540d\u7684\u547d\u540d\u898f\u5247\u53ef\u80fd\u6709\u6240\u4e0d\u540c\uff0c\u4f7f\u7528\u6642\u9700\u53c3\u8003\u76f8\u61c9\u7684\u6587\u6a94\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-yMNsqeujgr\">\u7e3d\u7d50<\/h2>\n<p>SQL \u6578\u64da\u5eab\u7684\u5225\u540d\u529f\u80fd\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u7684\u53ef\u8b80\u6027\u548c\u7c21\u6f54\u6027\u3002\u901a\u904e\u70ba\u5217\u548c\u8868\u6307\u5b9a\u5225\u540d\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u66f4\u8f15\u9b06\u5730\u64b0\u5beb\u548c\u7406\u89e3\u8907\u96dc\u7684 SQL \u67e5\u8a62\u3002\u7121\u8ad6\u662f\u5728\u65e5\u5e38\u7684\u6578\u64da\u64cd\u4f5c\u9084\u662f\u9032\u884c\u6578\u64da\u5206\u6790\u6642\uff0c\u5408\u7406\u4f7f\u7528\u5225\u540d\u90fd\u80fd\u986f\u8457\u63d0\u5347\u5de5\u4f5c\u6548\u7387\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\">\u9999\u6e2f VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u52a9\u60a8\u8f15\u9b06\u7ba1\u7406\u60a8\u7684\u6578\u64da\u5eab\u548c\u61c9\u7528\u7a0b\u5f0f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3 SQL 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