>>>I got:
>>>Operand data type datetime is invalid for sum operator.
>>>Because DATETIME1 - DATETIME2 is also datetime.
>>>

>>>DECLARE @Test TABLE (Fld1 datetime, Fld2 datetime)
>>>DECLARE @i int
>>>SET @i = 0
>>>WHILE @i < 20
>>>      BEGIN 
>>>         INSERT INTO @Test VALUES (GETDATE()+@i, GETDATE()+@i*20)
>>>         SET @i = @i +1
>>>      END
>>>SELECT SUM(Fld2-Fld2) FROM @Test
>>>

>>
>>I've no,idea what you're talking about :)
>
>
>ROFL
>Yep, now you haven't :-)

8-)