Question

我的查询是：

CROSS APPLY(
SELECT SUM(Payment)
FROM (
    SELECT TOP(ABS(2)) Payment 
    FROM dbo.table1 
) AS T
) AS EC(ExpCalc)

加入后我需要这样的东西：

CROSS APPLY(
SELECT SUM(Payment)
FROM (
    SELECT TOP(ABS(2)) Payment 
    FROM dbo.table1 t1
) AS T
) AS EC(ExpCalc) JOIN dbo.info i on t1.key = i.key

我该如何做到这一点？

Answer 1

首先，你不能做你想做的事，因为你没有回归key。但更大的答案是你可以做一个join，但你可以做一个相关的子查询：

CROSS APPLY
(SELECT SUM(Payment)
 FROM (SELECT TOP(ABS(2)) Payment 
       FROM dbo.table1 t1
       WHERE t1.key = i.key
------^
      ) T
) AS EC(ExpCalc)

这会出现在这样的FROM子句中：

FROM dbo.info i CROSS APPLY
(SELECT SUM(Payment)
 FROM (SELECT TOP(ABS(2)) Payment 
       FROM dbo.table1 t1
       WHERE t1.key = i.key
      ) T
) AS EC(ExpCalc)

我们可以在CROSS APPLY中加入表吗？

1 个答案: