[英]SQL Query: SUM on three columns with criteria
I have a table with columns like these : 我有一张桌子,上面有这些列:
idx | amount | usercol1 | usercol2 | usercol3 | percentage1 | percentage2 | percentage3
Data is typically like this : 数据通常是这样的:
0 | 1500 | 1 | null | null | 100 | null | null
1 | 3000 | 2 | 3 | null | 50 | 50 | null
I would like to make a SUM() of every user's amount. 我想对每个用户的数量做一个SUM()。
Example : 范例:
I tried UNION to no avail (did not sum the SUMs). 我尝试使用UNION无济于事(未对总和求和)。
Is there a way to do this ? 有没有办法做到这一点 ? The problem being that it should GROUP BY the username (which I get with a LEFT OUTER JOIN usernames ON exampletable.usercol1=usernames.idx).
问题在于它应该按用户名分组(我在exampletable.usercol1 = usernames.idx上通过左外连接用户名获得)。
I know this is non standard and would be better with relations from another table. 我知道这是非标准的,与其他表格的关系会更好。 But I am not allowed to change the table structure.
但是我不允许更改表结构。
Many many many thanks ! 非常感谢! :=)
:=)
Hereby, an example that gives a wrong result (seems to give only results from the query in the middle) 在此,给出一个错误结果的示例(似乎仅在中间给出查询的结果)
(
SELECT SUM(projects.amount * (projects.percentage1/100)) as totalproj,
entities.idx as idx,
COUNT(projects.idx) as numproj,
entities.name
FROM projects
INNER JOIN entities ON projects.usercol1=entities.idx
WHERE projects.usercol1=entities.idx
GROUP BY name ORDER BY totalproj DESC
)
UNION ALL
(
SELECT SUM(projects.amount * (projects.percentage2/100)) as totalproj,
entities.idx as idx,
COUNT(projects.idx) as numproj,
entities.name
FROM projects
INNER JOIN entities ON projects.usercol2=entities.idx
WHERE projects.usercol2=entities.idx
GROUP BY name ORDER BY totalproj DESC
)
UNION ALL
(
SELECT SUM(projects.amount * (projects.percentage3/100)) as totalproj,
entities.idx as idx,
COUNT(projects.idx) as numproj,
entities.name
FROM projects
INNER JOIN entities ON projects.usercol3=entities.idx
WHERE projects.usercol3=entities.idx
GROUP BY name ORDER BY totalproj DESC
)
ORDER BY totalproj DESC
LIMIT 10
You could use a derived table to simulate a first normal form table then join onto that. 您可以使用派生表来模拟第一个范式表,然后将其联接到该表上。
SELECT SUM(P.amount * (P.percentage/100)) as totalproj,
entities.idx as idx,
COUNT(P.idx) as numproj,
entities.name
FROM
(
SELECT idx, amount, usercol1 AS usercol, percentage1 AS percentage
FROM projects
UNION ALL
SELECT idx, amount, usercol2 AS usercol, percentage2 AS percentage
FROM projects
UNION ALL
SELECT idx, amount, usercol3 AS usercol, percentage3 AS percentage
FROM projects
) P
INNER JOIN entities ON P.usercol=entities.idx
WHERE P.usercol=entities.idx
GROUP BY name
ORDER BY totalproj DESC
using this data (i added some stranger data to make sure the math was working properly) 使用此数据(我添加了一些陌生数据以确保数学正常运行)
0 1500 1 NULL NULL 100 NULL NULL
1 3000 2 3 NULL 50 50 NULL
2 780 4 1 3 70 20 50
3 3800 2 4 1 30 20 10
i got these results 我得到了这些结果
user commission
------- -------------
1 2036
2 2640
3 1890
4 1306
is this what you were looking for? 这是您要找的东西吗? below is my query
以下是我的查询
SELECT [user]
,SUM([commission]) AS commission
FROM ( SELECT [usercol1] AS [user]
,( [amount] * [percentage1] ) / 100 AS commission
FROM [dbo].[projects]
WHERE [usercol1] IS NOT NULL
AND [percentage1] IS NOT NULL
UNION ALL
SELECT [usercol2]
,( [amount] * [percentage2] ) / 100
FROM [dbo].[projects]
WHERE [usercol2] IS NOT NULL
AND [percentage2] IS NOT NULL
UNION ALL
SELECT [usercol3]
,( [amount] * [percentage3] ) / 100
FROM [dbo].[projects]
WHERE [usercol3] IS NOT NULL
AND [percentage3] IS NOT NULL
) x
GROUP BY [user]
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