Need to generate n rows based on a value in a column

Question

I have the following table

TABLE A

ID | QUANTITY
------------
1  | 3
2  | 2

What I need is

TABLE B

ID | Ref          


        

Answer 1

This would also do the trick. It uses recursion, creates a table with rows 1-100.

WITH NBR ( NUM ) AS (
    SELECT 1 UNION ALL
    SELECT 1 + NUM FROM NBR 
    WHERE NUM < 100
)
SELECT * into NUMBERS from NBR