{"id":2358,"date":"2025-03-04T20:25:59","date_gmt":"2025-03-04T12:25:59","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=2358"},"modified":"2025-03-04T20:25:59","modified_gmt":"2025-03-04T12:25:59","slug":"sqlite-%e5%88%ab%e5%90%8d","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/03\/04\/sqlite-%e5%88%ab%e5%90%8d\/","title":{"rendered":"SQLite\u00a0\u522b\u540d"},"content":{"rendered":"\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u5728 SQLite \u4e2d\uff0c\u522b\u540d\uff08Alias\uff09\u53ef\u4ee5\u7528\u4e8e\u8868\u548c\u5217\uff0c\u5e2e\u52a9\u7b80\u5316\u67e5\u8be2\u6216\u7ed9\u590d\u6742\u7684\u8868\u8fbe\u5f0f\u547d\u540d\u3002\u522b\u540d\u901a\u5e38\u5728 <code>SELECT<\/code> \u67e5\u8be2\u4e2d\u4f7f\u7528\uff0c\u901a\u8fc7 <code>AS<\/code> \u5173\u952e\u5b57\u6307\u5b9a\u3002<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\">1. \u5217\u7684\u522b\u540d<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5217\u522b\u540d\u7528\u6765\u4e3a\u67e5\u8be2\u4e2d\u7684\u5217\u6307\u5b9a\u4e00\u4e2a\u4e34\u65f6\u540d\u79f0\uff0c\u901a\u5e38\u7528\u4e8e\u7b80\u5316\u5217\u540d\u6216\u4e3a\u8ba1\u7b97\u5217\u521b\u5efa\u4e00\u4e2a\u6613\u4e8e\u7406\u89e3\u7684\u540d\u5b57\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u8bed\u6cd5<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT column_name AS alias_name\nFROM table_name;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u793a\u4f8b<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT first_name AS \"First Name\", last_name AS \"Last Name\"\nFROM employees;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u8fd9\u4e2a\u67e5\u8be2\u4e2d\uff0c<code>first_name<\/code> \u5217\u88ab\u547d\u540d\u4e3a <code>\"First Name\"<\/code>\uff0c<code>last_name<\/code> \u88ab\u547d\u540d\u4e3a <code>\"Last Name\"<\/code>\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. \u8868\u7684\u522b\u540d<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u8868\u522b\u540d\u7528\u6765\u4e3a\u8868\u6307\u5b9a\u4e00\u4e2a\u77ed\u7684\u540d\u79f0\uff0c\u5728 SQL \u67e5\u8be2\u4e2d\u5f15\u7528\u65f6\u66f4\u4e3a\u7b80\u6d01\u3002\u901a\u5e38\u548c JOIN \u64cd\u4f5c\u4e00\u8d77\u4f7f\u7528\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u8bed\u6cd5<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT column_name\nFROM table_name AS alias_name;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u793a\u4f8b<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT e.first_name, e.last_name\nFROM employees AS e\nWHERE e.department = 'HR';<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728\u8fd9\u4e2a\u67e5\u8be2\u4e2d\uff0c<code>employees<\/code> \u8868\u88ab\u547d\u540d\u4e3a <code>e<\/code>\uff0c\u7136\u540e\u5728\u67e5\u8be2\u4e2d\u5f15\u7528 <code>e<\/code> \u6765\u8bbf\u95ee\u5217\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. \u4f7f\u7528\u522b\u540d\u7684\u6ce8\u610f\u4e8b\u9879<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u522b\u540d\u53ef\u4ee5\u4f7f\u7528\u7a7a\u683c\uff0c\u4f46\u901a\u5e38\u9700\u8981\u7528\u5f15\u53f7\u6216\u53cc\u5f15\u53f7\u62ec\u8d77\u6765\u3002<\/li>\n\n\n\n<li><code>AS<\/code> \u5173\u952e\u5b57\u662f\u53ef\u9009\u7684\uff0c\u53ef\u4ee5\u7701\u7565\uff0c\u76f4\u63a5\u5199\u522b\u540d\u4e5f\u53ef\u4ee5\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u793a\u4f8b<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT first_name \"First Name\", last_name \"Last Name\"\nFROM employees;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u522b\u540d\u7684\u4e3b\u8981\u76ee\u7684\u662f\u63d0\u5347\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u7b80\u6d01\u6027\uff0c\u7279\u522b\u662f\u5728\u6d89\u53ca\u590d\u6742\u67e5\u8be2\u65f6\u3002\u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 SQLite \u4e2d\uff0c\u522b\u540d\uff08Alias\uff09\u53ef\u4ee5\u7528\u4e8e\u8868\u548c\u5217\uff0c\u5e2e\u52a9\u7b80\u5316\u67e5\u8be2\u6216\u7ed9\u590d\u6742\u7684\u8868\u8fbe\u5f0f\u547d\u540d\u3002\u522b\u540d\u901a\u5e38\u5728 SELE [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[76],"tags":[],"class_list":["post-2358","post","type-post","status-publish","format-standard","hentry","category-sqlite"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2358","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=2358"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2358\/revisions"}],"predecessor-version":[{"id":2359,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2358\/revisions\/2359"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=2358"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=2358"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=2358"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}