{"id":160725,"date":"2024-11-04T00:29:31","date_gmt":"2024-11-03T16:29:31","guid":{"rendered":"https:\/\/server.hk\/cnblog\/160725\/"},"modified":"2024-11-04T00:29:32","modified_gmt":"2024-11-03T16:29:32","slug":"%e8%b3%87%e6%96%99%e5%ba%ab%e6%95%99%e7%a8%8b%ef%bc%9amysql-as%ef%bc%9a%e8%a8%ad%e7%bd%ae%e5%88%a5%e5%90%8d","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/160725\/","title":{"rendered":"\u8cc7\u6599\u5eab\u6559\u7a0b\uff1aMySQL AS\uff1a\u8a2d\u7f6e\u5225\u540d"},"content":{"rendered":"<h1 id=\"%e8%b3%87%e6%96%99%e5%ba%ab%e6%95%99%e7%a8%8b%ef%bc%9amysql-as%ef%bc%9a%e8%a8%ad%e7%bd%ae%e5%88%a5%e5%90%8d-gEXZHKFOIK\">\u8cc7\u6599\u5eab\u6559\u7a0b\uff1aMySQL AS\uff1a\u8a2d\u7f6e\u5225\u540d<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cMySQL \u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u958b\u6e90\u95dc\u806f\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u3002\u5b83\u7684\u9748\u6d3b\u6027\u548c\u5f37\u5927\u529f\u80fd\u4f7f\u5176\u6210\u70ba\u8a31\u591a\u958b\u767c\u8005\u548c\u4f01\u696d\u7684\u9996\u9078\u3002\u5728 MySQL \u4e2d\uff0c\u4f7f\u7528\u5225\u540d\uff08Alias\uff09\u662f\u4e00\u500b\u5e38\u898b\u7684\u64cd\u4f5c\uff0c\u80fd\u5920\u5e6b\u52a9\u6211\u5011\u7c21\u5316\u67e5\u8a62\u8a9e\u53e5\uff0c\u63d0\u5347\u53ef\u8b80\u6027\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u5982\u4f55\u5728 MySQL \u4e2d\u4f7f\u7528 AS \u95dc\u9375\u5b57\u4f86\u8a2d\u7f6e\u5225\u540d\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e5%88%a5%e5%90%8d%ef%bc%88alias%ef%bc%89%ef%bc%9f-gEXZHKFOIK\">\u4ec0\u9ebc\u662f\u5225\u540d\uff08Alias\uff09\uff1f<\/h2>\n<p>\u5225\u540d\u662f\u7528\u4f86\u7d66\u8cc7\u6599\u8868\u6216\u8cc7\u6599\u5eab\u4e2d\u7684\u6b04\u4f4d\u6307\u5b9a\u4e00\u500b\u81e8\u6642\u540d\u7a31\u3002\u9019\u5728\u67e5\u8a62\u4e2d\u5c24\u5176\u6709\u7528\uff0c\u56e0\u70ba\u5b83\u53ef\u4ee5\u4f7f\u7d50\u679c\u96c6\u66f4\u6613\u65bc\u7406\u89e3\uff0c\u4e26\u4e14\u53ef\u4ee5\u907f\u514d\u4f7f\u7528\u5197\u9577\u7684\u6b04\u4f4d\u540d\u7a31\u3002\u4f7f\u7528\u5225\u540d\u4e0d\u6703\u6539\u8b8a\u8cc7\u6599\u5eab\u4e2d\u7684\u5be6\u969b\u8cc7\u6599\uff0c\u53ea\u662f\u5728\u67e5\u8a62\u7d50\u679c\u4e2d\u63d0\u4f9b\u4e86\u4e00\u500b\u66f4\u53cb\u597d\u7684\u986f\u793a\u65b9\u5f0f\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8-as-%e8%a8%ad%e7%bd%ae%e5%88%a5%e5%90%8d-gEXZHKFOIK\">\u4f7f\u7528 AS \u8a2d\u7f6e\u5225\u540d<\/h2>\n<p>\u5728 MySQL \u4e2d\uff0c\u4f7f\u7528 AS \u95dc\u9375\u5b57\u4f86\u8a2d\u7f6e\u5225\u540d\u7684\u8a9e\u6cd5\u975e\u5e38\u7c21\u55ae\u3002\u4ee5\u4e0b\u662f\u57fa\u672c\u7684\u8a9e\u6cd5\u7d50\u69cb\uff1a<\/p>\n<pre><code>SELECT column_name AS alias_name\nFROM table_name;<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>column_name<\/code> \u662f\u4f60\u60f3\u8981\u67e5\u8a62\u7684\u6b04\u4f4d\u540d\u7a31\uff0c\u800c <code>alias_name<\/code> \u5247\u662f\u4f60\u5e0c\u671b\u7d66\u9019\u500b\u6b04\u4f4d\u6307\u5b9a\u7684\u5225\u540d\u3002\u63a5\u4e0b\u4f86\uff0c\u6211\u5011\u5c07\u901a\u904e\u4e00\u4e9b\u793a\u4f8b\u4f86\u8aaa\u660e\u5982\u4f55\u4f7f\u7528 AS \u8a2d\u7f6e\u5225\u540d\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b-1%ef%bc%9a%e8%a8%ad%e7%bd%ae%e6%ac%84%e4%bd%8d%e5%88%a5%e5%90%8d-gEXZHKFOIK\">\u793a\u4f8b 1\uff1a\u8a2d\u7f6e\u6b04\u4f4d\u5225\u540d<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba <code>employees<\/code> \u7684\u8cc7\u6599\u8868\uff0c\u5305\u542b\u4ee5\u4e0b\u6b04\u4f4d\uff1a<code>first_name<\/code>\u3001<code>last_name<\/code> \u548c <code>salary<\/code>\u3002\u5982\u679c\u6211\u5011\u60f3\u8981\u67e5\u8a62\u54e1\u5de5\u7684\u5168\u540d\u4e26\u5c07\u5176\u986f\u793a\u70ba <code>Full Name<\/code>\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT CONCAT(first_name, ' ', last_name) AS 'Full Name'\nFROM employees;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u6211\u5011\u4f7f\u7528\u4e86 <code>CONCAT<\/code> \u51fd\u6578\u4f86\u5408\u4f75 <code>first_name<\/code> \u548c <code>last_name<\/code>\uff0c\u4e26\u5c07\u7d50\u679c\u547d\u540d\u70ba <code>Full Name<\/code>\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b-2%ef%bc%9a%e8%a8%ad%e7%bd%ae%e8%a1%a8%e5%88%a5%e5%90%8d-gEXZHKFOIK\">\u793a\u4f8b 2\uff1a\u8a2d\u7f6e\u8868\u5225\u540d<\/h3>\n<p>\u9664\u4e86\u8a2d\u7f6e\u6b04\u4f4d\u5225\u540d\u5916\uff0c\u6211\u5011\u9084\u53ef\u4ee5\u70ba\u8cc7\u6599\u8868\u8a2d\u7f6e\u5225\u540d\u3002\u9019\u5728\u9032\u884c\u591a\u8868\u67e5\u8a62\u6642\u7279\u5225\u6709\u7528\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT e.first_name, e.last_name\nFROM employees AS e\nWHERE e.salary &gt; 50000;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0c\u6211\u5011\u5c07 <code>employees<\/code> \u8cc7\u6599\u8868\u8a2d\u7f6e\u70ba\u5225\u540d <code>e<\/code>\uff0c\u9019\u6a23\u5728\u67e5\u8a62\u4e2d\u5f15\u7528\u6b04\u4f4d\u6642\u5c31\u53ef\u4ee5\u4f7f\u7528\u66f4\u77ed\u7684\u540d\u7a31\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e5%88%a5%e5%90%8d%e7%9a%84%e5%a5%bd%e8%99%95-gEXZHKFOIK\">\u4f7f\u7528\u5225\u540d\u7684\u597d\u8655<\/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\uff0c\u7279\u5225\u662f\u7576\u6b04\u4f4d\u540d\u7a31\u8f03\u9577\u6216\u4e0d\u76f4\u89c0\u6642\u3002<\/li>\n<li><strong>\u7c21\u5316\u67e5\u8a62\uff1a<\/strong>\u5728\u591a\u8868\u67e5\u8a62\u4e2d\uff0c\u4f7f\u7528\u5225\u540d\u53ef\u4ee5\u6e1b\u5c11\u91cd\u8907\u7684\u8868\u540d\u7a31\uff0c\u8b93\u67e5\u8a62\u66f4\u7c21\u6f54\u3002<\/li>\n<li><strong>\u907f\u514d\u885d\u7a81\uff1a<\/strong>\u5728\u806f\u63a5\u67e5\u8a62\u4e2d\uff0c\u4f7f\u7528\u5225\u540d\u53ef\u4ee5\u907f\u514d\u6b04\u4f4d\u540d\u7a31\u885d\u7a81\u7684\u554f\u984c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-gEXZHKFOIK\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528\u5225\u540d\u6642\uff0c\u6709\u5e7e\u9ede\u9700\u8981\u6ce8\u610f\uff1a<\/p>\n<ul>\n<li>\u5225\u540d\u4e0d\u9700\u8981\u4f7f\u7528 <code>AS<\/code> \u95dc\u9375\u5b57\uff0c\u4f46\u4f7f\u7528\u5b83\u53ef\u4ee5\u63d0\u9ad8\u53ef\u8b80\u6027\u3002<\/li>\n<li>\u5982\u679c\u5225\u540d\u5305\u542b\u7a7a\u683c\u6216\u7279\u6b8a\u5b57\u7b26\uff0c\u5247\u9700\u8981\u4f7f\u7528\u55ae\u5f15\u865f\u6216\u96d9\u5f15\u865f\u5c07\u5176\u62ec\u8d77\u4f86\u3002<\/li>\n<li>\u5225\u540d\u50c5\u5728\u67e5\u8a62\u7684\u7d50\u679c\u96c6\u4e2d\u6709\u6548\uff0c\u4e26\u4e0d\u6703\u5f71\u97ff\u8cc7\u6599\u5eab\u4e2d\u7684\u5be6\u969b\u6b04\u4f4d\u540d\u7a31\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-gEXZHKFOIK\">\u7e3d\u7d50<\/h2>\n<p>\u5728 MySQL \u4e2d\uff0c\u4f7f\u7528 AS \u8a2d\u7f6e\u5225\u540d\u662f\u4e00\u500b\u7c21\u55ae\u800c\u6709\u6548\u7684\u65b9\u5f0f\uff0c\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u7684\u53ef\u8b80\u6027\u548c\u7c21\u6f54\u6027\u3002\u7121\u8ad6\u662f\u70ba\u6b04\u4f4d\u9084\u662f\u8cc7\u6599\u8868\u8a2d\u7f6e\u5225\u540d\uff0c\u9019\u7a2e\u6280\u8853\u90fd\u80fd\u5e6b\u52a9\u958b\u767c\u8005\u66f4\u597d\u5730\u7d44\u7e54\u548c\u7406\u89e3\u8cc7\u6599\u3002\u5c0d\u65bc\u9700\u8981\u8655\u7406\u5927\u91cf\u8cc7\u6599\u7684\u958b\u767c\u8005\u4f86\u8aaa\uff0c\u638c\u63e1\u9019\u4e00\u6280\u5de7\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f\u8cc7\u6599\u5eab\u7ba1\u7406\u9084\u662f\u7db2\u7ad9\u6258\u7ba1\uff0c\u6211\u5011\u7684 <a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a> \u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728MySQL\u4e2d\u4f7f\u7528AS\u8a2d\u7f6e\u5225\u540d\uff0c\u7c21\u5316\u67e5\u8a62\u8a9e\u53e5\uff0c\u63d0\u9ad8\u6578\u64da\u5eab\u64cd\u4f5c\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-160725","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160725","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=160725"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160725\/revisions"}],"predecessor-version":[{"id":160726,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/160725\/revisions\/160726"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=160725"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=160725"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=160725"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}