The query would become
SELECT a.id, a.name, array_acc(b.name) as b_names
FROM a LEFT JOIN b USING(id)
GROUP BY a.id, a.name;
All variants are possible. Variant with array_to_string is faster and
doesn't need own aggregate function. And you can easy remove
duplicities.
SELECT a.id, a.name,
Le lundi 02 juillet 2007, D. Dante Lorenso a écrit :
> I wanted to select several rows of data and have them returned in a
> single record with the rows joined by a delimiter. Turns out this is
> very easy to do in PostgreSQL:
>
>SELECT a.id, a.name,
> ARRAY_TO_STRING(ARRAY(
>SELE
