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/* syntax version 1 */
/* postgres can not */
select listlength(aggregate_list(distinct x)) as c from (
select AsList(1,2) as x
union all
select AsList(1,3) as x
union all
select AsList(1,2) as x
);
select count(distinct x) as c from (
select AsList(1,2) as x
union all
select AsList(1,3) as x
union all
select AsList(1,2) as x
);
select x,count(distinct y) as c from (
select AsList(1,2) as x,AsList(4) as y
union all
select AsList(1,3) as x,AsList(4) as y
union all
select AsList(1,3) as x,AsList(4) as y
union all
select AsList(1,3) as x,AsList(4) as y
union all
select AsList(1,2) as x,AsList(5) as y
union all
select AsList(1,2) as x,AsList(5) as y
) group by x
order by c;
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