问题
I really need to take what I have as a result of a CTE, and calculate the cummulative value of groups of data.
The dataset is:
PERIOD FT GROUP DEPT VALUE
1 Actual KINDER MATH 200
2 Actual KINDER MATH 363
3 Actual KINDER MATH 366
1 Budget KINDER MATH 457
2 Budget KINDER MATH 60
3 Budget KINDER MATH 158
1 Actual HIGHSCH ENGLISH 456
2 Actual HIGHSCH ENGLISH 745
3 Actual HIGHSCH ENGLISH 125
1 Budget HIGHSCH ENGLISH 364
2 Budget HIGHSCH ENGLISH 158
3 Budget HIGHSCH ENGLISH 200
6 Budget HIGHSCH ENGLISH 502
7 Budget HIGHSCH ENGLISH 650
1 Actual COLL ENGLISH 700
2 Actual COLL ENGLISH 540
3 Actual COLL ENGLISH 160
1 Budget COLL ENGLISH 820
2 Budget COLL ENGLISH 630
3 Budget COLL ENGLISH 800
What I want is an additional column that holds the cummulative amount for each FT, Group, Dept.
So basically, I would like it to look like this:
PERIOD FT GROUP DEPT VALUE ACC VALUE
1 Actual KINDER MATH 200 200
2 Actual KINDER MATH 363 563
3 Actual KINDER MATH 366 929
1 Budget KINDER MATH 457 457
2 Budget KINDER MATH 60 517
3 Budget KINDER MATH 158 675
1 Actual HIGHSCH ENGLISH 456 456
2 Actual HIGHSCH ENGLISH 745 1201
3 Actual HIGHSCH ENGLISH 125 1326
1 Budget HIGHSCH ENGLISH 364 364
2 Budget HIGHSCH ENGLISH 158 522
3 Budget HIGHSCH ENGLISH 200 722
1 Budget HIGHSCH ENGLISH 502 502
2 Budget HIGHSCH ENGLISH 650 1152
3 Budget HIGHSCH ENGLISH 336 1488
1 Actual COLL ENGLISH 700 700
2 Actual COLL ENGLISH 540 1240
3 Actual COLL ENGLISH 160 1400
1 Budget COLL ENGLISH 820 820
2 Budget COLL ENGLISH 630 1450
3 Budget COLL ENGLISH 800 2250
If I was in SQL 2012, I'd use something similar to this:
SELECT period
,ft
,group
,dept
,value
,CASE
WHEN FT = 'Actual' THEN SUM(value) OVER (PARTITION BY dept, group, ft ORDER BY period)
ELSE value
END AS AccValue
FROM myTable
However, I am on 2008 and can't use this method and am stumped on how to replicate this for my data.
Please can anyone help?
回答1:
This should work. (I changed a forbidden column name from "GROUP" to "GROUP_")
with cte (PERIOD, FT, GROUP_, DEPT, VALUE, AccValue) as (select t1.PERIOD, t1.FT, t1.GROUP_, t1.DEPT, t1.VALUE, SUM(t2.VALUE) as AccValue
from myTable t1
join myTable t2 on t1.PERIOD>= t2.PERIOD
and t1.FT = t2.FT
and t1.GROUP_ = t2.GROUP_
and t1.DEPT = t2.DEPT
group by t1.PERIOD, t1.FT, t1.GROUP_, t1.DEPT, t1.VALUE
)
select PERIOD
,FT
,GROUP_
,DEPT
,VALUE
,CASE
WHEN FT = 'Actual' THEN AccValue
ELSE VALUE
END AS AccValue
from cte
order by GROUP_ desc, FT, PERIOD, DEPT desc, VALUE
回答2:
Simple INNER JOIN should do the trick. Unless I'm misunderstanding you, what you want is a running total, correct?
This example creates a dummy table with dummy data, then uses an inner join for the running total. From a performance standpoint, the Common Table Expression is likely more efficient. But for simplicity, the inner join my be preferential.
/* Dummy table */
create table testing1
(col1 int not null identity(1,1),
col2 varchar(5),
col3 int)
insert into testing1
values ('a', 10), ('a', 20), ('a', 30), ('b', 40), ('b', 50)
/* Running total example */
SELECT a.col1
, a.col2
, a.col3
, SUM(b.col3) AS total
FROM testing1 a INNER JOIN testing1 b
ON a.col1 >= b.col1
AND a.col2 = b.col2
GROUP BY a.col1, a.col2, a.col3
ORDER BY a.col1
/* Edit to include Output */
col1 col2 col3 total
1 a 10 10
2 a 20 30
3 a 30 60
4 b 40 40
5 b 50 90
来源：https://stackoverflow.com/questions/19684249/tsql-2008-sumx-over-partition-order-by-clause