Hvordan viser man rækkenumre i PostgreSQL-forespørgsel?

select   row_number() over (order by <field> nulls last) as rownum, *
from     foo_tbl
order by <field>

Hvis bestilling ikke er nødvendig, kan dette svar også forenkles:

select row_number() over(), *  -- notice: no fields are needed
from   foo_tbl

SQL Fiddle Proof of Concept