mysql - 您如何使用连接/联合从两个不同的表中选择值？

Question

我有两张桌子

用户

ID   Name  
1    test      
2    test2

和

应用

UserID    URL
  1       website1
  2       website2

我正在尝试执行一个查询，该查询将创建与此类似的内容。

查询结果

Name     URL
test     website1
test2    website2

我的尝试

SELECT u.Name, a.URL FROM users as u, application as a INNER JOIN u.ID = a.UserID

我试过这个，但它似乎没有工作。任何帮助，将不胜感激。

Answer 1

需要注意的几项，表别名不需要as并join推断出内部连接。此查询还取决于应用程序表的实际名称，您可能需要替换为artist_application.

SELECT u.Name, a.URL 
FROM users u 
join application a
on u.ID = a.UserID

Answer 2

尝试JOIN

Select
u.Name, 
a.URL
from 
`USERS` u
INNER JOIN artist_application a on (u.id = a.userId)

Answer 3

正确的语法是

SELECT u.Name, a.URL 
FROM users as u
left join artist_application as a on u.ID = a.UserID

Answer 4

SELECT u.Name, a.URL 
FROM users as u, artist_application as a 
WHERE u.ID = a.UserID

Answer 5

您可以执行以下操作：

SELECT u.Name, a.URL
FROM users as u, artist_application as a
WHERE u.ID = a.UserID

Answer 6

干得好。

SELECT u.Name, a.URL FROM users as u INNER JOIN artist_application as a on u.ID = a.UserID