Question

我正在寻找一个关于如何合并两个表而没有任何共同点的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?

我正在寻找一个关于如何合并两个表而没有任何共同点的SQL答案。

Answer 1

您可以通过创建一个键（行号）并加入它来完成此操作。

SQL的大多数方言都支持row_number()函数。这是一种使用它的方法：

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;

Answer 2

假设你想在你的例子中与男孩匹配，并且在记录之间有某种有意义的关系（没有双关语意）......

通常，您可以使用单独的表来表示两者之间的关联（关系）。

enter image description here

这不会为您提供物理表，但它可以让您编写表示最终结果的SQL查询：

SELECT     Girls.ID AS GirlId, Girls.Name AS GirlName, Guys.ID AS GuyId, Guys.Name AS GuyName
FROM         Couples INNER JOIN
             Girls ON Couples.GirlId = Girls.ID INNER JOIN
             Guys ON Couples.GuyId = Guys.ID

然后您可以使用Select Into语法

动态创建表格

  SELECT     Girls.ID AS GirlId, Girls.Name AS GirlName, Guys.ID AS GuyId, Guys.Name AS GuyName
    INTO MyNewTable
    FROM         Couples INNER JOIN
                 Girls ON Couples.GirlId = Girls.ID INNER JOIN
                 Guys ON Couples.GuyId = Guys.ID

（但标准规范化规则会说最好将它们保存在不同的表中，而不是创建临时表，除非有性能原因不这样做。）

Answer 3

仅仅因为我写了它，一个使用CTE的替代方案;

WITH guys2 AS ( SELECT id,name,ROW_NUMBER() OVER (ORDER BY id) rn FROM guys), 
    girls2 AS ( SELECT id,name,ROW_NUMBER() OVER (ORDER BY id) rn FROM girls)
SELECT  guys2.id guyid,   guys2.name guyname, 
       girls2.id girlid, girls2.name girlname
FROM guys2 FULL OUTER JOIN girls2 ON guys2.rn = girls2.rn
ORDER BY COALESCE(guys2.rn, girls2.rn);

An SQLfiddle to test with

Answer 4

我一直都需要这个， - 使用我的表格输入在Excel中创建模板。这来自一个拥有我的地区的桌子，另一个带有一年的宿舍。结果给出了每个季度/期间的一个区域名称。

SELECT b.quarter_qty，a.mkt_name FROM TBL_MKTS a，TBL_PERIODS b

sql并排表并排，没有任何共同之处

4 个答案: