Question

using sql server 2008

I would like to take a table that has 11 million records and divide them into chunks of 50000 each while maintaining the original table and just making sure each chunk contains unique records.
If I select top 50000 records for the first batch, how can I guarantee I get the next 50000 and so on.

Answer 1

Use the ranking functions, in particular row-number():

DECLARE
  @From  int
 ,@Thru  int

--  Example here would be the second set
SET @From = 50001
SET @Thru = 100000

SELECT <columns>
 from (select <columns>, row_number() over (order by <PrimaryKey>) Ranking
        from MyTable) xx
 where Ranking between @From and @Thru