From: | Richard Huxton <dev(at)archonet(dot)com> |
---|---|
To: | Bart Degryse <Bart(dot)Degryse(at)indicator(dot)be> |
Cc: | PostgreSQL SQL List <pgsql-sql(at)postgresql(dot)org> |
Subject: | Re: Function description |
Date: | 2008-02-15 10:15:45 |
Message-ID: | 47B56651.9050600@archonet.com |
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Thread: | |
Lists: | pgsql-sql |
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
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