SQL 子查询作为表达式

Question

I have the following two tables:

Create Table #Claims (ClaimId int, FormType varchar(3), AdjustmentVersion int)

Create Table #Secondary (FeeId int, FeeName varchar(60))

I want to be able to return all the claims that are a specific FormType and AdjustmentVersion.

Given the following query:

select * from #Claims where FormType = 'DEN' and AdjustmentVersion in (1,2,3,(select FeeId from #Secondary))

How do I correct the syntax to match the AdjustmentVersion on the given integers and the subquery at the same time? Currently, I am getting error 'Subquery returned more than one result'.

I tried using and OR with AdjustmentVersion but that ended up ignoring the FormType = 'DEN'

Answer 1

You're trying to pass in a result set into an IN clause. You can only give it a scalar (eg you could give it the TOP 1 row). The right way to apply a condition like this is to add an EXISTS clause to your WHERE. Alternative guide .

If you still need some guidance after reading those, let me know.

Answer 2

You can split the values into two sets, the literals and the subquery:

select *
  from #Claims
  where FormType = 'DEN' and
    ( AdjustmentVersion in (1,2,3) or AdjustmentVersion in (select FeeId from #Secondary) );