如何使用在mysql中

Question

条款是否有这样做的查询任何其他方式的别名：

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

我尝试过，但得到了一个错误，它说在mysql中未知列

Answer 1

这可能是由于lessor而不是lessor_name where子句。所以，下面一次尝试：

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

Answer 2

也许这将工作：

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

Answer 3

在MySQL中，你不能使用别名附近WHERE。

Answer 4

这将工作。

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