每组之前的原始数据

Question

我应该执行哪些查询才能逐行显示原始数据？有没有办法做到这一点？

User   ReceiptNo   Price
-----  ----------  ------
A      876         100
A      877          50
                   **150**
B      960          60
B      961          40
                   **100**

Answer 1

大多数数据库都支持标准组，例如rollup或grouping sets等修饰符。如果是这样，你可以这样做：

select user, receiptno, sum(price) as price
from t
group by grouping sets ((user, receiptno), (user));

Answer 2

select user, receiptno, price, 1 as order_column 
from t
union all
select user, '' as receiptno, sum(price) as price, 2 as order_column 
from t
group by user

order by user, order_column

您可以将结果与原始数据结合，并添加要在ORDER BY中使用的人工列，以将聚合行放在组的末尾（在原始数据之后）。