Question

I have the following sql:

    select * from 
    ( 
         select p.ID, 
         Received = (select Rec from Exp   
                     where EstAmt = (select MAX(ex.EstAmt) from Exp ex 
                                     where ex.Prot = p.ID and EstAmt > 0) 
                    )    

   From Prot  
   ) subsel 
   where Received = 1 

I want to do a case on the Received so if it is 1 then have it say ‘Yes’ else have it say ‘No’.
I know how to do a case but not in this situation as I have Received which is a subquery.

I tried the following but did not work

     select * from 
     ( 
       select p.ID, 

       case Received = (select Rec from Exp   
                        where EstAmt = (select MAX(ex.EstAmt) from Exp ex 
                                        where ex.Prot = p.ID and EstAmt > 0) 
                  )    
      when 1 then 'Yes'
      else 'No'
      end Received
      From Prot  
     ) subsel 
    where Received = 1 

Answer 1

Instead of

case Received = (select Rec from Exp   
                        where EstAmt = (select MAX(ex.EstAmt) from Exp ex 
                                        where ex.Prot = p.ID and EstAmt > 0) 
                  )  

try:

case (select Rec from Exp   
                            where EstAmt = (select MAX(ex.EstAmt) from Exp ex 
                                            where ex.Prot = p.ID and EstAmt > 0) 
                      )  

Other answers have important points too, but you can’t assign the value of a subquery to Received, just use a single value after “case” and make sure the subquery does not return multiple values.