Sql里面的條件是“as”列

Question

我有這個問題：

SELECT Param1, Param2 AS P1
FROM SomeTable

我想做這樣的事情：

WHERE P1 > 2

有辦法做到這一點？ 當然有一個查詢而不是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

嘗試這個

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

Answer 3

而不是使用有條款的地方..

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

Answer 4

您可以使用子查詢：

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

Answer 5

閱讀本文，詳細解釋如下：

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

嘗試這個，

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

如果您使用ms sql，這應該可行

Answer 7

HAVING不行。 如上所述的公用表是一種很好的方法。