Victor Dobrovolsky <booby.stager@gmail.com> writes:
> From that - "short and dirty translation" - point of view - should I prefer
> to divide that
> $$
> Select
> case $1
> when '1'::numeric then tbl.p1
> when '2'::numeric then tbl.p2
> ...
> end as cresult
> $$
> expression into:
> $$
> ...
> if $1 = '1'::numeric then (query_1)
> elsif when '2'::numeric then (query_2)
> ...
> end if;
> ...
> $$
Yeah, that would probably be a preferable approach if you're hoping
for significantly different query plans for the two cases. PG does
not have the sort of run-time plan choice mechanism that you're
describing for Oracle.
regards, tom lane
