相同查询上的不同Group By子句(Select/Where)

Question

我可以重复使用复杂的选择Where子句到不同的组吗？

我在做什么:

(Select X, Count(*) From [Big where clause with many tables] Group By X)
Union All
(Select Y, Count(*) From [Big where clause with many tables] Group By Y)

我怎么能选择这个呢？

我正在使用SQL Server 2008,这将进入一个函数,但可能是一个存储过程.

Answer 1

WITH basequery AS (Select * From [Big where clause with many tables])
SELECT X, COUNT(*) FROM basequery GROUP BY X
UNION ALL
SELECT Y, COUNT(*) FROM basequery GROUP BY Y;

CTE是针对这种情况而制作的.