Andrew Dunstan wrote:
>
>
> On 08/04/2011 04:55 PM, Tom Lane wrote:
> > Bruce Momjian<bruce@momjian.us> writes:
> >> One thing we don't optimize is INSERT ... SELECT when the table is
> >> created or truncated in the same transaction. Seems we could.
> >> We optimize CREATE TABLE AS which is effectively SELECT ... INTO using a
> >> different syntax. Is this a TODO?
> > Considering that SELECT INTO is deprecated, I don't think we should be
> > expending effort to encourage people to use it.
> >
> >
>
>
> Right, but the original point about INSERT ... SELECT seems reasonable, no?
Right. I brought up SELECT INTO because you could make the argument
that INSERT ... SELECT is not a utility command like the other ones and
therefore can't be done easily, but CREATE TABLE AS is internal SELECT
INTO and implemented in execMain.c, which I think is where INSERT ...
SELECT would also be implemented.
-- Bruce Momjian <bruce@momjian.us> http://momjian.us EnterpriseDB
http://enterprisedb.com
+ It's impossible for everything to be true. +
