Question

I have a CTE as below (logic removed)

;with cte_a as
(
    select ID, Count(AnotherID) as Counter
    from Table_A
    group by ID
)

and a user defined function that takes an Id as input and returns a table.

udf_GetRelatedItemIds(@Id)

I wanted to just count the number of related item ids returned from the user defined function for each ID in cte_a.

I was trying something like below but it didn’t work

;with cte_a as
(
    select ID, Count(AnotherID) as Counter
    from Table_A
    group by ID
)
select 
ID, 
Count(select RelatedId from udf_GetRelatedItemIds(ID))
from cte_a

Please suggest a solution.

Answer 1

What about

with cte_a as
(
    select ID, Count(AnotherID) as Counter
    from Table_A
    group by ID
)
select 
a.ID, 
(SELECT COUNT(*) FROM udf_GetRelatedItemIds(a.ID)) as IntersectCount
from cte_a a