如何在mysql的where子句中使用别名

Question

还有其他方法可以执行此查询：

SELECT CONCAT_WS(" ", strLname, strFname, strMname) AS lessor_name 
FROM tbl_lessor 
WHERE lessor = '$lessor_name'

我尝试了但是在mysql中显示了未知列的错误

Answer 1

可能是由于lessor而不是where子句中的lessor_name。所以请尝试以下一次：

SELECT CONCAT_WS(" ", strLname, strFname, strMname) AS lessor_name 
FROM tbl_lessor 
having lessor_name= '$lessor_name'

Answer 2

在MySQL中，您不能使用 WHERE 附近的别名。

Answer 3

也许这会奏效：

SELECT CONCAT_WS(" ", strLname, strFname, strMname) AS lessor_name  
FROM tbl_lessor  
WHERE CONCAT_WS(" ", strLname, strFname, strMname) = '$lessor_name' 

Answer 4

这样可行。

SELECT * FROM (SELECT CONCAT_WS(" ", strLname, strFname, strMname) AS lessor_name 
FROM tbl_lessor) AS t1 
WHERE lessor_name = '$lessor_name'