Is there a way to split the results of a select query into two equal halfs?

Question

I need a solution for a select query in Sql Server 2005.

I\'d like to have a query returning two ResultSets each of which holding exactly half of all records matchin

Answer 1

If this is SQL Server 2000, then I'd be inclined to find the PK of the middle value like so:

Declare @MiddleId int

Set @MiddleId = (
                Select TOP 1 PK
                From (
                        Select TOP 50 PERCENT PK
                        From Table
                        Order By TheId ASC
                        )
                Order By TheId DESC
                )

Select ...
From Table
Where TheId <= @MiddleId

Select ..
From Table
Where TheId > @MiddleId

With SQL Server 2005, I'd be inclined to do the same but you can use a CTE

;With NumProjects As
    (
    Select Id, ROW_NUMBER() OVER (ORDER BY TheId ASC ) As Num
    From Table
    )
Select @MiddleId = Id
From Table
Where Num = CEILING( (Select Count(*) From Table) / 2 )