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      1. MYSQL INSERT SELECT 问题

        MYSQL INSERT SELECT problem(MYSQL INSERT SELECT 问题)
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                  本文介绍了MYSQL INSERT SELECT 问题的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着跟版网的小编来一起学习吧!

                  问题描述

                  我在理解如何执行某些 INSERT SELECT 方面有点困难.

                  i have a little difficulty in understanding how to do some INSERT SELECT.

                  例如我有两张桌子.

                  TABLE : users  
                  
                   id | name   | gender  
                   1  | John   | m  
                   2  | Mary   | f  
                  
                  TABLE : website  
                  
                   fid | url             | id  
                   1   | www.desilva.biz | 2  
                   2   | gidhelp.com     | 4  
                  

                  现在假设我想向表格网站添加另一个查询.我得到两个变量,让我们说:

                  Now let's say i want to add another query to the table website. I get two variables, lets say:

                  $user = John;
                  $site = "www.google.com";
                  

                  我想从 users 表中选择 John 的 id 并在一个语句中将其插入到 website 表中.

                  i want to select the id of John from users table and insert it into website table in one statement.

                  我该怎么做?

                  推荐答案

                  假设你的变量已经被正确转义并且不受SQL注入的影响:

                  Assuming your variables are already escaped properly and are not subject to SQL injection:

                  INSERT
                  INTO    website (url, fid)
                  SELECT  $site, id
                  FROM    users
                  WHERE   name = $user
                  

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