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
>
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