{"id":217791,"date":"2023-12-23T00:19:32","date_gmt":"2023-12-22T16:19:32","guid":{"rendered":"https:\/\/www.idc.net\/help\/217791\/"},"modified":"2023-12-23T00:19:32","modified_gmt":"2023-12-22T16:19:32","slug":"mysql%e4%bd%bf%e7%94%a8%e6%89%8b%e5%86%8c%ef%bc%9a%e4%bd%bf%e7%94%a8as%e5%85%b3%e9%94%ae%e5%ad%97%e7%94%a8%e5%88%ab%e5%90%8d%e9%87%8d%e5%91%bd%e5%90%8d%e5%88%97%e6%88%96%e8%a1%a8","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/217791\/","title":{"rendered":"MySQL\u4f7f\u7528\u624b\u518c\uff1a\u4f7f\u7528AS\u5173\u952e\u5b57\u7528\u522b\u540d\u91cd\u547d\u540d\u5217\u6216\u8868"},"content":{"rendered":"<p><title id=\"mysql%e4%bd%bf%e7%94%a8%e6%89%8b%e5%86%8c%ef%bc%9a%e4%bd%bf%e7%94%a8as%e5%85%b3%e9%94%ae%e5%ad%97%e7%94%a8%e5%88%ab%e5%90%8d%e9%87%8d%e5%91%bd%e5%90%8d%e5%88%97%e6%88%96%e8%a1%a8-zsoFFzVyEV\">MySQL\u4f7f\u7528\u624b\u518c\uff1a\u4f7f\u7528AS\u5173\u952e\u5b57\u7528\u522b\u540d\u91cd\u547d\u540d\u5217\u6216\u8868<\/title><\/p>\n<h1 id=\"mysql%e4%bd%bf%e7%94%a8%e6%89%8b%e5%86%8c%ef%bc%9a%e4%bd%bf%e7%94%a8as%e5%85%b3%e9%94%ae%e5%ad%97%e7%94%a8%e5%88%ab%e5%90%8d%e9%87%8d%e5%91%bd%e5%90%8d%e5%88%97%e6%88%96%e8%a1%a8-zsoFFzVyEV\">MySQL\u4f7f\u7528\u624b\u518c\uff1a\u4f7f\u7528AS\u5173\u952e\u5b57\u7528\u522b\u540d\u91cd\u547d\u540d\u5217\u6216\u8868<\/h1>\n<p>\u5728MySQL\u4e2d\uff0c\u4f7f\u7528AS\u5173\u952e\u5b57\u53ef\u4ee5\u4e3a\u5217\u6216\u8868\u6307\u5b9a\u522b\u540d\uff0c\u4ee5\u4fbf\u5728\u67e5\u8be2\u7ed3\u679c\u4e2d\u4f7f\u7528\u66f4\u5177\u63cf\u8ff0\u6027\u7684\u540d\u79f0\u3002\u8fd9\u5bf9\u4e8e\u63d0\u9ad8\u67e5\u8be2\u53ef\u8bfb\u6027\u548c\u7b80\u5316\u590d\u6742\u67e5\u8be2\u975e\u5e38\u6709\u7528\u3002<\/p>\n<h2 id=\"%e9%87%8d%e5%91%bd%e5%90%8d%e5%88%97-zsoFFzVyEV\">\u91cd\u547d\u540d\u5217<\/h2>\n<p>\u8981\u91cd\u547d\u540d\u5217\uff0c\u53ef\u4ee5\u5728SELECT\u8bed\u53e5\u4e2d\u4f7f\u7528AS\u5173\u952e\u5b57\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT column_name AS alias_name\nFROM table_name;<\/code><\/pre>\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c<code>column_name<\/code>\u662f\u8981\u91cd\u547d\u540d\u7684\u5217\u7684\u540d\u79f0\uff0c<code>alias_name<\/code>\u662f\u6307\u5b9a\u7684\u522b\u540d\u3002\u67e5\u8be2\u7ed3\u679c\u5c06\u4f7f\u7528\u522b\u540d\u800c\u4e0d\u662f\u539f\u59cb\u5217\u540d\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u540d\u4e3a<code>employees<\/code>\u7684\u8868\uff0c\u5176\u4e2d\u5305\u542b<code>first_name<\/code>\u548c<code>last_name<\/code>\u5217\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8be2\u6765\u91cd\u547d\u540d\u8fd9\u4e9b\u5217\uff1a<\/p>\n<pre><code>SELECT first_name AS \u59d3, last_name AS \u540d\nFROM employees;<\/code><\/pre>\n<p>\u8fd9\u5c06\u8fd4\u56de\u4e00\u4e2a\u7ed3\u679c\u96c6\uff0c\u5176\u4e2d\u7684\u5217\u540d\u5206\u522b\u4e3a\u201c\u59d3\u201d\u548c\u201c\u540d\u201d\uff0c\u800c\u4e0d\u662f\u201cfirst_name\u201d\u548c\u201clast_name\u201d\u3002<\/p>\n<h2 id=\"%e9%87%8d%e5%91%bd%e5%90%8d%e8%a1%a8-zsoFFzVyEV\">\u91cd\u547d\u540d\u8868<\/h2>\n<p>\u9664\u4e86\u91cd\u547d\u540d\u5217\uff0c\u8fd8\u53ef\u4ee5\u4f7f\u7528AS\u5173\u952e\u5b57\u91cd\u547d\u540d\u8868\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT column_name\nFROM table_name AS alias_name;<\/code><\/pre>\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c<code>table_name<\/code>\u662f\u8981\u91cd\u547d\u540d\u7684\u8868\u7684\u540d\u79f0\uff0c<code>alias_name<\/code>\u662f\u6307\u5b9a\u7684\u522b\u540d\u3002\u67e5\u8be2\u7ed3\u679c\u5c06\u4f7f\u7528\u522b\u540d\u800c\u4e0d\u662f\u539f\u59cb\u8868\u540d\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u540d\u4e3a<code>orders<\/code>\u7684\u8868\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8be2\u6765\u91cd\u547d\u540d\u8fd9\u4e2a\u8868\uff1a<\/p>\n<pre><code>SELECT *\nFROM orders AS \u8ba2\u5355;<\/code><\/pre>\n<p>\u8fd9\u5c06\u8fd4\u56de\u4e00\u4e2a\u7ed3\u679c\u96c6\uff0c\u5176\u4e2d\u7684\u8868\u540d\u4e3a\u201c\u8ba2\u5355\u201d\uff0c\u800c\u4e0d\u662f\u201corders\u201d\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e5%88%ab%e5%90%8d%e8%bf%9b%e8%a1%8c%e8%ae%a1%e7%ae%97-zsoFFzVyEV\">\u4f7f\u7528\u522b\u540d\u8fdb\u884c\u8ba1\u7b97<\/h2>\n<p>\u9664\u4e86\u63d0\u9ad8\u53ef\u8bfb\u6027\uff0c\u4f7f\u7528\u522b\u540d\u8fd8\u53ef\u4ee5\u5728\u67e5\u8be2\u4e2d\u8fdb\u884c\u8ba1\u7b97\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT column_name1 + column_name2 AS sum\nFROM table_name;<\/code><\/pre>\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c<code>column_name1<\/code>\u548c<code>column_name2<\/code>\u662f\u8981\u76f8\u52a0\u7684\u5217\u7684\u540d\u79f0\uff0c<code>sum<\/code>\u662f\u6307\u5b9a\u7684\u522b\u540d\u3002\u67e5\u8be2\u7ed3\u679c\u5c06\u5305\u542b\u4e00\u4e2a\u540d\u4e3a\u201csum\u201d\u7684\u5217\uff0c\u5176\u4e2d\u7684\u503c\u662f<code>column_name1<\/code>\u548c<code>column_name2<\/code>\u76f8\u52a0\u7684\u7ed3\u679c\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u540d\u4e3a<code>sales<\/code>\u7684\u8868\uff0c\u5176\u4e2d\u5305\u542b<code>quantity<\/code>\u548c<code>price<\/code>\u5217\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8be2\u6765\u8ba1\u7b97\u9500\u552e\u603b\u989d\uff1a<\/p>\n<pre><code>SELECT quantity * price AS total\nFROM sales;<\/code><\/pre>\n<p>\u8fd9\u5c06\u8fd4\u56de\u4e00\u4e2a\u7ed3\u679c\u96c6\uff0c\u5176\u4e2d\u7684\u5217\u540d\u4e3a\u201ctotal\u201d\uff0c\u5176\u4e2d\u7684\u503c\u662f<code>quantity<\/code>\u548c<code>price<\/code>\u76f8\u4e58\u7684\u7ed3\u679c\u3002<\/p>\n<h2 id=\"%e6%80%bb%e7%bb%93-zsoFFzVyEV\">\u603b\u7ed3<\/h2>\n<p>\u4f7f\u7528AS\u5173\u952e\u5b57\u53ef\u4ee5\u4e3aMySQL\u67e5\u8be2\u4e2d\u7684\u5217\u6216\u8868\u6307\u5b9a\u522b\u540d\uff0c\u4ee5\u63d0\u9ad8\u67e5\u8be2\u53ef\u8bfb\u6027\u548c\u7b80\u5316\u590d\u6742\u67e5\u8be2\u3002\u901a\u8fc7\u91cd\u547d\u540d\u5217\u6216\u8868\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u66f4\u5177\u63cf\u8ff0\u6027\u7684\u540d\u79f0\u6765\u8868\u793a\u6570\u636e\uff0c\u4f7f\u67e5\u8be2\u7ed3\u679c\u66f4\u6613\u4e8e\u7406\u89e3\u3002\u6b64\u5916\uff0c\u4f7f\u7528\u522b\u540d\u8fd8\u53ef\u4ee5\u5728\u67e5\u8be2\u4e2d\u8fdb\u884c\u8ba1\u7b97\uff0c\u4ece\u800c\u5f97\u5230\u66f4\u6709\u7528\u7684\u7ed3\u679c\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5bfb\u627e\u4e00\u4e2a\u53ef\u9760\u7684\u4e91\u8ba1\u7b97\u670d\u52a1\u63d0\u4f9b\u5546\uff0c\u540e\u6d6a\u4e91\u662f\u4e00\u4e2a\u4e0d\u9519\u7684\u9009\u62e9\u3002\u4ed6\u4eec\u63d0\u4f9b\u9999\u6e2f\u670d\u52a1\u5668\u3001\u7f8e\u56fd\u670d\u52a1\u5668\u548c\u4e91\u670d\u52a1\u5668\u7b49\u591a\u79cd\u4ea7\u54c1\uff0c\u4e3a\u60a8\u7684\u4e1a\u52a1\u63d0\u4f9b\u7a33\u5b9a\u53ef\u9760\u7684\u57fa\u7840\u8bbe\u65bd\u652f\u6301\u3002\u60a8\u53ef\u4ee5\u8bbf\u95ee<a href=\"https:\/\/idc.net\">\u540e\u6d6a\u4e91\u5b98\u7f51<\/a>\u4e86\u89e3\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>MySQL\u4f7f\u7528\u624b\u518c\uff1a\u4f7f\u7528AS\u5173\u952e\u5b57\u7528\u522b\u540d\u91cd\u547d\u540d\u5217\u6216\u8868 MySQL\u4f7f\u7528\u624b\u518c\uff1a\u4f7f\u7528AS\u5173\u952e\u5b57\u7528\u522b\u540d\u91cd\u547d\u540d\u5217\u6216\u8868 \u5728 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[197851],"tags":[],"class_list":["post-217791","post","type-post","status-publish","format-standard","hentry","category-php"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/217791","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=217791"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/217791\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=217791"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=217791"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=217791"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}