insert multiple records into table based on values in colume

Question

I have a table basetable as given below

id name qty price
2  a    2    20
3  d    3    10
4  b    5    60

i want to insert the rec

Answer 1

You can use a recursive CTE to generate the data:

with cte as (
      select bt.id, bt.name, bt.qty, bt.price, 1 as cnt
      from basetable bt
      union all
      select bt.id, bt.name, bt.qty, bt.price, cnt + 1
      from cte
      where cnt < bt.qty
     )
select id, name, 1 as qty, price
from cte;

If you want to put the data in another table, then either use an insert before the select or an into after the select.

Note: If your quantities get really big, you might have to investigate the MAXRECURSION option.