每组前的原始数据

Question

我应该执行哪些查询才能在每组前按行显示原始数据？有办法吗？

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

Answer 1

大多数数据库支持标准的分组方式，如 rollup 或 grouping sets。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合并，并添加一个人工列以在 ORDER BY 中使用，以将聚合行放在组的末尾（在原始数据之后）。

每组前的原始数据

Raw data before each group by

sql

group-by

rollup

sql-server-2008-r2