Sql里面的条件是“as”列

Question

我有这个问题：

SELECT Param1, Param2 AS P1
FROM SomeTable

我想做这样的事情：

WHERE P1 > 2

有办法做到这一点吗？ 当然有一个查询而不是Param2。

Answer 1

WITH ABC
AS
(
SELECT Param1, Param2 AS P1
FROM SomeTable
)
SELECT * from ABC where P1>2

Answer 2

您可以使用having

试试这个

select param1,param2 as p1
 from table
 having p1 > 2

Answer 3

而不是使用having子句..

    SELECT Param1, Param2 AS P1 
     FROM SomeTable 
     having P1>2;

Answer 4

您可以使用子查询：

SELECT Param1, P1
FROM
(
  SELECT Param1, Param2 AS P1
  FROM SomeTable
) src
WHERE P1 > 2

Answer 5

阅读本文，详细解释：

http://databases.aspfaq.com/database/how-do-i-use-a-select-list-alias-in-the-where-or-group-by-clause.html

拉​​吉

Answer 6

试试这个，

SELECT Param1, 
[P1] = Param2
FROM SomeTable
WHERE [P1] > 2

如果您正在使用ms sql，那么这应该可以正常工作

Answer 7

HAVING不起作用。如上所述的公用表是一种很好的方法。