“具有查询”与“临时表”的性能比较

Question

明智地选择查询性能> 1）进行查询或2）临时表中的哪个更好

1）

 with table_map as ( select * from t1 where x=y),
    select col1, sum(col) from table_map group by 1
    union all
    select col2, sum(col) from table_map group by 1
    union all
    select col3, sum(col) from table_map group by 1

2）

 create temp table tmp_details as (select * from t1 where x=y) 
select col1, sum(col) from tmp_details group by 1
union all
select col2, sum(col) from tmp_details group by 1
union all
select col3, sum(col) from tmp_details group by 1