c limit 00; explain (costs off, nodes off) select count(distinct(a)) col0, max(b) col0, count(distinct(b)) col0, min(c) col0, count(distinct(c)) guo, avg(a) qiang from t_distinct; select count(distinct(a)) col0, max(b) col0, count(distinct(b)) col0, min(c) col0, count(distinct(c)) guo, avg(a) qiang from t_distinct; explain (costs off, nodes off) select count(distinct(a))+avg(b) col0, count(c) col0, d from t_distinct group by d having count(distinct(c))>0