SQL Sub查询和案例陈述

Question

我使用下面的代码从POS表中获得了唯一ID，现在我需要获取它旁边的地址信息，并将其与客户主表进行比较。

select 
subqueries.id
from
(
select (cust_key) as id from dbo.pos
union
select (disti_key) as id from dbo.pos
union 
select (reseller_key) as id from dbo.pos
)subqueries

Answer 1

我假设客户主表具有一个主键列id，并使其名称为customers

select subqueries.id, c.adress
from (select (cust_key) as id from pos
      union
      select (disti_key) as id from pos
      union 
      select (reseller_key) as id from pos
     ) subqueries
join customers c on subqueries.id = c.id