Question

I have the following query:

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 
where Received = 1

In the above, Received is a field I created as an alias that will get the value of what Rec is. Rec is a field in the table.

But when I put Received in the where clause I get: Invalid Column Name ‘Received’. As mentioned, Received is not a field in the table but a place hold er that gets the value from the subquery. Any idea on how i can have Received in the where clause as I need to show the result only if that value is 1.

Answer 1

You would have to filter the results of your original query, using it as a sub query:

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