SQL Server - INNER JOIN WITH DISTINCT

Question

I am having a hard time doing the following:

select a.FirstName, a.LastName, v.District
from AddTbl a order by Firstname
inner join (select distinct LastName         


        

Answer 1

It's not the same doing a select distinct at the beginning because you are wasting all the calculated rows from the result.

select a.FirstName, a.LastName, v.District
from AddTbl a order by Firstname
natural join (select distinct LastName from
            ValTbl v  where a.LastName = v.LastName)

try that.