表与来自不同表的列数据

Question

我想创建包含两列的表并将数据插入到列中 两个不同的表。我使用查询来生成源表的交叉产品。

以下查询： -

create table test 
as 
select a.offer_id as offer_id,b.poid as poid 
from (select distinct offer_id from table1 limit 5) a, (select distinct poid from table2 limit 5) b;

如何避免跨产品。

Answer 1

我怀疑你想要这样的东西：

select a.offer_id as offer_id, b.poid as poid 
from (select offer_id, row_number() over (order by rand()) as seqnum
      from (select distinct offer_id from table1 limit 5) a
     ) a join
     (select poid, row_number() over (order by rand()) as seqnum
      from (select distinct poid from table2 limit 5) b
     ) b
     on a.seqnum = b.seqnum;