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create table t(a, b, c, d) as select floor(random()*10) , floor(random()*10) , floor(random()*10) , floor(random()*10) from generate_series(1,3);
3 rows affected
 hidden batch(es)


select * from t;
a b c d
9 8 6 6
4 9 4 7
0 7 2 6
 hidden batch(es)


select distinct unnest( array_agg(distinct a)|| array_agg(distinct b)|| array_agg(distinct c)|| array_agg(distinct d) ) from t order by 1;
unnest
0
2
4
6
7
8
9
 hidden batch(es)