From: | mig(at)utdt(dot)edu |
---|---|
To: | pgsql-sql(at)postgresql(dot)org |
Subject: | Re: Returning sets from functions? |
Date: | 2000-04-23 15:02:01 |
Message-ID: | 200004231502.MAA05163@ant.utdt |
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Thread: | |
Lists: | pgsql-sql |
Sorry, I forgot part of my question in the previous message:
How do you return a "setof" value from a PG/Tcl procedure? Returning
a list does not seem to work ...
### PREVIOUS MESSAGE WAS ...
Consider
create function followers(text) returns setof text as
'select id from ids where id > $1 '
language 'sql';
The function seems to work OK:
select followers('h');
does return all indexes after the index 'h'.
On the other hand,
select * from ids where id in (select followers('h'));
produces the message
ERROR: An operand to the '=' operator returns a set of text,
but '=' takes single values, not sets.
Apparently the phrase
select followers('h');
returns a set with members which are 'setof text'. psql has no trouble
displaying all rows, but the parser does ...
So, my question is: can I produce a set in a function so that it
mimicks perfectly the return set of a select query?
I am using PG 6.5.3; is this already solved in the 7.0 beta?
Thanks
Miguel Sofer
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