On Tue, Jan 2, 2018 at 1:36 PM, Tony Papadimitriou <to...@acm.org> wrote:
> create table t(s);
> insert into t values ('A'),('A'),('B');
>
> select group_concat(s,', ') from t group by null; -- OK
> select group_concat(distinct s) from t group by null; -- OK
> select group_concat(distinct s,', ') from t group by null; -- ERROR
>
> -- The moment the optional delimiter is given along with DISTINCT you get
> this error:
> -- Error: near line 6: DISTINCT aggregates must have exactly one argument
A limitation of the SQL syntax. I suspect this might work for your
example use case: select group_concat(s, ',') from (select distinct s
as s from t) group by null;
Tested and confirmed here.
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