John Found wrote:
> i.e. how to select only the groups that contain
> some value in the set of values in a column not
> specified in group by clause.
>
> select
> (select group_concat(b) from t t1 where t1.a = t2.a) as list
> from t t2
> where b = ?1;
Similarly:
select
group_concat(b) as list
from t
where a in (select a
from t
where b = ?1)
group by a;
But you will not be able to avoid the subquery: the filter has to
include all other rows of the group with matching b, and after the
group_concat(), the result is no longer in a form useful for lookups.
(And doing the filter after the grouping is probably not efficient.)
Regards,
Clemens
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