How to unfold the results of an Oracle query based on the value of a column

Question

I have a table on a Oracle DB with two columns. I would like to see every row repeated as many times as the number stored in the second column. The table looks like this:

Answer 1

If a is your table then you can also do :

select a1.col1 , a1.col2 
      from a a1
      join  (select level col2  from dual 
      connect by level < ( select max(col2) + 1 from a))   a2
      on a2.col2 between 1 and a1.col2