如何在 SQL 的 case 语句中添加 2 个不同的列值？

Question

我有一个 Customer 表，用于存储每个客户在每种产品上花费的金额。 （如附图中给出的第一个表格）

我想要的是找出第二张表中的捆绑产品花了多少钱。

这只是我编写的示例查询

  select EmailAddress 
       , case when Books>0 and Movies>0 then sum(Books + Movies)  end as Books_Movies
       , case when Books>0 and Games>0 then sum(Books + Games)  end as Books_Games
       , case when Movies>0 and Games>0 then sum(Movies + Games) end as Books_Music
       
    from Customers

任何帮助真的很感激

Answer 1

您正在使您的解决方案复杂化，而它就像这样简单：

select EmailAddress 
       , (Books + Movies) as Books_Movies
       , (Books + Games) as Books_Games
       , (Movies + Games) as Books_Music       
from Customers