sql并排合并没有任何共同点的表

Question

我正在寻找关于如何合并两个没有任何共同点的表的 sql 答案。

So let's say you have these two tables without anything in common:

Guys                Girls
id    name          id   name
---  ------        ----  ------
1     abraham        5    sarah
2     isaak          6    rachel
3     jacob          7    rebeka
                     8    leah

and you want to merge them side-by-side like this:

Couples

id   name      id   name
---  ------    ---  ------
1    abraham   5    sarah
2    isaak     6    rachel
3    jacob     7    rebeka
               8    leah

How can this be done?

我正在寻找关于如何合并两个没有任何共同点的表的 sql 答案。

Answer 1

您可以通过创建一个键(即行号)并加入它来完成此操作。

大多数 SQL 方言都支持 row_number() 函数。这是使用它的方法:

select gu.id, gu.name, gi.id, gi.name
from (select g.*, row_number() over (order by id) as seqnum
      from guys g
     ) gu full outer join
     (select g.*, row_number() over (order by id) as seqnum
      from girls g
     ) gi
     on gu.seqnum = gi.seqnum;