Question

我在这里遇到一些逻辑问题。试图得到S.ID不在我的子查询中的行数。

COUNT(CASE WHEN S.ID IN
(SELECT DISTINCT S.ID FROM...) 
THEN 1 ELSE 0 END)

我收到了错误：

Cannot perform an aggregate function on an expression containing an aggregate or a subquery.

如何解决这个问题或替代方案？

Answer 1

也许是这样的？

SELECT COUNT(*) FROM .... WHERE ID NOT IN (SELECT DISTINCT ID FROM ...)

Answer 2

使用EXISTS：

SELECT COUNT(t.*) FROM table1 t WHERE NOT EXISTS (SELECT * FROM table2 WHERE ID = t.ID)

Answer 3

将以下构造与CTE一起使用。

  with cte as 
  (
  select 
    case
     when S.ID in (SELECT DISTINCT S.ID FROM LookupTable) then 1
     else 0
    end
    as SID
  from MyTable)
  select count(SID) as SIDCOUNT from cte;

进入时的TSQL计数案例

3 个答案: