[英]Sum based on row number in SQL
Sorry if the title is inappropriate.Let me explain what am trying to do. 对不起,如果标题不合适。让我解释一下我想做什么。 I have a calender table which i used for fetching data from my sales table.
我有一个日历表,用于从我的销售表中获取数据。 Here is the resulting table.
这是结果表。
SoldQty StandardDate RowNum
1 2013-10-30 1
5 2013-10-31 2
1 2013-10-30 3
1 2013-10-31 4
4 2013-10-30 5
1 2013-10-31 6
2 2013-10-31 8
1 2013-10-31 9
What i need is the sum based on row number i need the sum of values of first three rows,then the next three and the last 3. Is there a way to achieve this or should i insert this into a temp table and write select statements based on the row number. 我需要的是基于行号的总和我需要前三行的值的总和,然后是接下来的三行和最后一行3.有没有办法实现这个或者我应该将它插入临时表并写入select语句基于行号。 Thanks in advance
提前致谢
Update: 更新:
Expected output should be like this 预期的输出应该是这样的
Sold
1.4 ->(sum of 1 to 3)*.20
1.8 ->(sum of 4 to 6)*.30
2 ->(sum of 7 to 9)*.50
or just 要不就
Sold
5.2 -> sum of all the above values
When you need to group result, you must have a group to do that ;-). 当您需要对结果进行分组时,您必须有一个组才能这样做;-)。
For you case you can use the column RowNum
. 对于您的情况,您可以使用
RowNum
列。 The trick is to translate the sequence into grouped values. 诀窍是将序列转换为分组值。
1 - 0
2 - 0
3 - 0
4 - 1
5 - 1
6 - 1
This is quite easy to do with math. 这对数学很容易。
(RowNum -1 ) / 3
will do the trick. (RowNum -1 ) / 3
将成功。
So the query for you is 所以你的查询是
select count(SoldQty) from table group by (RowNum -1 ) / 3
The query below will give you the sums by categories you described: 下面的查询将为您提供您所描述的类别的总和:
DECLARE @maxRowNumber INT
SELECT @maxRowNumber = MAX(RowNum)
FROM Data;
WITH Sums(Description, Total)
AS (SELECT 'Sum of 1 to 3',
SUM(SoldQty) * .20
FROM Data
WHERE RowNum <= 3
UNION ALL
SELECT 'Sum of 4 to 6',
SUM(SoldQty) * .30
FROM Data
WHERE RowNum >= 4
AND RowNum <= 6
UNION ALL
SELECT 'Sum of '
+ CAST(@maxRowNumber-3 AS VARCHAR(10))
+ ' to '
+ CAST(@maxRowNumber AS VARCHAR(10)),
SUM(SoldQty) * .30
FROM Data
WHERE RowNum >= @maxRowNumber - 3)
SELECT *
FROM Sums
To get the sum of the values from categories, replace *
with SUM(Total)
要从类别中获取值的总和,请将
*
替换为SUM(Total)
The final query you are looking for is: 您要查找的最终查询是:
select
sum( SoldQty * case ( ( [numrow]-1) /3)
when 0 then 0.2
when 1 then 0.3
when 2 then 0.5
end ) as result
from [yourCalendarTable]
Notice than ( [numrow]-1) /3
is an integer but a decimal because you operate with integers. 注意比
( [numrow]-1) /3
是一个整数但是十进制,因为你用整数操作。
Take count(*) and store it in one int variable. 取count(*)并将其存储在一个int变量中。 then use the method "danihp" said above.
然后使用上面说的“danihp”方法。 OR Add one more column with identity take Max(identity_field) then use the same method.
或者再添加一个带有身份的列(Max(identity_field)),然后使用相同的方法。
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