mysql - SQL 喜欢在 concatted 字段上？

Question

在 mysql 中是否可以在连接字段上进行选择和搜索？

This is example: SELECT concat(members.name, " " ,members.surname) AS i FROM members where i LIKE '%string%'

Answer 1

您不能在 select 子句中为列加上别名，然后在 where 子句中使用它。

但是有很多方法可以做你想做的事情。

最接近的解决方案是使用HAVING而不是WHERE：

SELECT concat(members.name, " " ,members.surname) AS i 
FROM members 
HAVING i LIKE '%string%'

Answer 2

只需将 concat 添加到 WHERE

SELECT concat(members.name, " ", members.surname) as i FROM members WHERE concat(members.name, " ", members.surname) LIKE '%somestring%'

Answer 3

或者，像这样：

select * from
(SELECT concat(members.name, " " ,members.surname) AS i 
FROM members) con
where con.i LIKE '%string%' 

萨卢多斯 ;)