sql - 将一个查询的 X 个结果附加到另一个查询的 X 个结果（没有外键连接）

Question

此查询带回如下结果：select distinct date from dwh.product_count

April, 2013
March, 2013
February, 2013
January, 2013

我想附加许多结果 ^that^ 带回此查询的结果：

select distinct p_id dwh.members a

5
7
8
...etc

所以我的结果看起来像这样：

5    April, 2013
5    March, 2013
5    February, 2013
5    January, 2013
7    April, 2013
7    March, 2013
7    February, 2013
7    January, 2013
etc....

什么类型的查询会带来这些结果？

Answer 1

select id, dt
from 
    (select distinct p_id as id from dwh.members) s
    cross join
    (select distinct date as dt from dwh.product_count) t

Answer 2

select id, dt from 
( select distinct p_id as id from dwh.members )
.( select distinct date as dt from dwh.product_count )