From: PFC <lists@boutiquenumerique.com>
To: lucap@personainternet.com
To: pgsql-sql@postgresql.org
Subject: Re: select multiple immediate values, but in multiple rows
Date: Tue, 15 Mar 2005 15:20:14 +0100
Message-ID: <opsnonf00zth1vuj@localhost> (raw)
In-Reply-To: <200503142318.27510.lucap@shaw.ca>
References: <200503142318.27510.lucap@shaw.ca>
You need a function like this :
CREATE OR REPLACE FUNCTION array_srf( integer[] ) RETURNS SETOF integer
LANGUAGE PLPGSQL etc... AS
$$
DECLARE
_data ALIAS FOR $1;
_i INTEGER;
BEGIN
FOR _i IN 1..icount(_data) LOOP
RETURN NEXT _data[_i];
END LOOP;
RETURN;
END;
$$
select * from array_srf('{1,2,3,4}');
array_srf
-----------
1
2
3
4
(4 lignes)
This will avoid you the UNION.
> Hello all. I'd like to write a query does a set subtraction A - B, but
> A is
> is a set of constants that I need to provide in the query as immediate
> values. I thought of something like
>
> select a from (1,2,3.4)
> except
> select col_name from table;
>
> but I don't know the syntax to specify my set of constants. I thought of
> doing
> select 1 union select 2 union select 3 union ... except ...
> but I figure there must be a better way. The size of the set would be
> anywhere between 1 and about 5 or 6 elements. Is there a better way to
> do
> this?
>
> Thanks.
>
> Luca
>
> ---------------------------(end of broadcast)---------------------------
> TIP 8: explain analyze is your friend
>
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To: pgsql-sql@postgresql.org
Cc: lists@boutiquenumerique.com, lucap@personainternet.com
Subject: Re: select multiple immediate values, but in multiple rows
In-Reply-To: <opsnonf00zth1vuj@localhost>
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