SQl Query to break results into specifically sized groups

I need to write a query to identify 5 groups of different size. I know I can use NTILE to break my set up into equal size groups but I need something like this

Total Records say 1,000,000

Group 1 100,000 Rows
Group 2 200,000 Rows
Group 3 300,000 Rows
Group 4 400,000 Rows



Well, use row_number() and logic on top of that:

select (case when seqnum <= 100000 then 'Group1'
             when seqnum <= 100000 + 200000 then 'Group2'
             when seqnum <= 100000 + 200000 + 300000 then 'Group3'
             when seqnum <= 100000 + 200000  + 300000 + 400000 then 'Group4'
         end) as GroupName,
from (select t.*,
             row_number() over (order by <your criteria>) as seqnum
      from t
     ) t

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