CODEWITHSUNDEEP
postgresql
Sajja Srivichai
Sajja Srivichai

Reputation: 1

How to select data with multiple row output from 1 row (PostgreSQL)

I have data on table test like this

customer_no | name | chance
---------------------------
00000000001 | AAAA |     3
00000000002 | BBBB |     2
00000000003 | CCCC |     1

Now,i want to select from table test with multiple output that calculate by value of field chance

output like this

customer_no | name
------------------
00000000001 | AAAA
00000000001 | AAAA
00000000001 | AAAA
00000000002 | BBBB
00000000002 | BBBB
00000000003 | CCCC

how to select command in pgsql database?

Upvotes: 0

Views: 87

Answers (2)

krokodilko
krokodilko

Reputation: 36087

Try this:

SELECT  customer_no, name FROM (
  SELECT  test.*, 
          generate_series(1,chance) i
  FROM test
) test;

Here is a demo.

Upvotes: 4

roman
roman

Reputation: 117337

with recursive CTE_nums as (
    select max(chance) as num from test
    union all
    select num - 1 from CTE_nums
    where num > 1
)
select
   t.customer_no, t.name
from test as t
   inner join CTE_nums as n on n.num <= t.chance
order by 1, 2

SQL FIDDLE EXAMPLE

Upvotes: 1

Related Questions