Table Variables with an Alias in a Delete From Statement

Question

I want to delete rows from a SQL Server 2000/2005 table variable based on the presence of other rows in the same table (delete all 0 count rows if a non-0 count row exists with

Answer 1

Specify the alias name before FROM statement Meaning, you are deleting from the aliased table.

delete o1
from   @O as o1
where  ACount = 0 
       and exists ( select  Month 
                    from    @O o2 
                    where   o1.Month = o2.Month 
                            and o2.ACount > 0)

Result