serial in output - Mailing list pgsql-sql

Hi,

What function should I use to get a serial number, together with my results,
from a query?

Ex. Of output I want:

1    ooo    pp    ij
2    hou    joo    iu    
3    bhi    ft    yh

Basically, I would like to have one column with integers, from 1 onwards, no
matter how many tables I join in, or the data that I get back.

Thanks