Hi Juerg,
> I need to build an additional field (metakey) out of three fields in
> the table.
>
> SELECT a.a_kurzbez, a.a_ausgabenr, a.a_bundnr, a.a_nr, a.a_z_blaenge,
> a.a_z_laenge, a.a_z_umfang FROM auftrag a
>
> should be changed to something like
>
> SELECT (a.a_kurzbez + a.a_ausgabenr + a.a_bundnr) as metakey,
> a.a_kurzbez, a.a_ausgabenr, a.a_bundnr, a.a_nr, a.a_z_blaenge,
> a.a_z_laenge, a.a_z_umfang FROM auftrag a
Try the following:
SELECT a.a_kurzbez || ' ' || a.a_ausgabenr::text || ' ' || a.a_bundnr::text as metakey,... remainder as above
or, if you need that frequently, create a function:
CREATE FUNCTION metakey (text, int4, int4) returns text as
' SELECT $1 || ' ' || text($2) || ' ' || text($3) '
LANGUAGE 'sql';
|| is the "concatenate text" operator.
Change the param types and cast them as you need.
Hope that helps,
Christof.
> output :
>
> field : metakey a_kurzbez a_ausgabenr
> a_bundnr
>
> DMD 001 03 DMD 001
> 03
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