Dont' forget to cc: the list Bart :-)
Bart Degryse wrote:
> Thanks for that explanation Richard.
> But how can I know what they repeat without having documentation.
> I mean, how about functions like eg regexeqjoinsel, regexeqsel, reltimeeq, reltimege.
> I can imagine they mimic some other functionality, but how can I know whichone?
Well, like I said many implement operators, so they can be obviously be
found in pg_operator:
SELECT * FROM pg_operator WHERE oprcode = 'reltimeeq'::regproc;
The oprleft/right/result columns hold oid numbers for types in pg_type.
Casts are listed in pg_cast etc.
The fine manuals detail the system catalogues in a chapter "System
Catalogs".
http://www.postgresql.org/docs/8.3/static/catalogs.html
To see how e.g. \dC etc work start psql with -E
If it's not documented though, you need to ask two questions:
1. Why am I using it?
2. Will it be there in the next version?
-- Richard Huxton Archonet Ltd