How can I expand out a row into multiple row result set?

Question

I have a table that I\'m trying to break out each row into one or more rows based on the second column value. Like this:

table (id, pcs):
ABC   3
DEF   1
GH         


        

Answer 1

SELECT
  id
 ,pcs_num
FROM MyTable
CROSS APPLY (
  SELECT TOP (pcs)
    ROW_NUMBER() OVER(ORDER BY (SELECT 1)) pcs_num
  FROM master.dbo.spt_values
) t