Question

我陷入了SQL查询，

我有一个表薪水，其结构如下：

Name Amount
a     100
b     300
c     250

我必须编写一个查询，其结果如下：

 Name Amount RelevantAmount
    a     100    100
    b     300    400
    c     250    650

我没有发现如何在不使用任何游标和触发器的情况下编写此查询。

Answer 1

假设您希望总结列表中包含当前行的所有内容的数量，最简单的（但不一定是最有效的）答案将使用相关查询：

select
    name
,   amount
,   (select sum(amount) from MyTable t2 where t1.name <= t2.name) RelevantAmount
from MyTable t1
order by t1.Name

Answer 2

试试这个：

SELECT a.Name, a.Amount, SUM(b.Amount) as RelevantAmount
FROM myTable a
    JOIN myTable b
        ON b.Name <= a.Name
GROUP BY a.Name, a.Amount
ORDER BY a.Name ASC

Answer 3

据我理解你的问题，你可以这样做：


SELECT name,
SUM(amount) AS month_amount,
SUM(SUM(amount)) OVER
(ORDER BY amount ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW)
AS cumulative_amount
FROM table_name
GROUP BY name
ORDER BY name;

SQL查询问题

3 个答案: