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Calculate Sum of an Expression field


Calculate Sum of an Expression field

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sharonsql2013
sharonsql2013
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Here is the situation :
Transaction Type Cr Amount Db Amount Crvalue DBValue
C 500 100 400
D 100 300 200


CrValue and DbValue are Calculated Fields so I have written the following expression:

Expression for Cr value
= switch (Field!Transactiontype.value )= “C”,Field!CrAmount.Value-Field!DbAmount.value

Experssion for DBvalue
= switch (Field!Transactiontype.value )= “D”,Field!DbAmount.Value-Field!CrAmount.value

Up until here , I am able to see the above data fine.
But ,now I need to get the total sum the Expression CrValue and DBValue.
How do I calculate the Sum of an Expression field.

Kindly advise
metralgia
metralgia
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Wrapping your expression in a "sum" doesn't work? e.g. Sum(<expression>Wink
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I don't do anything in Reporting Services, so this could be totally off base, but the following works for me:


declare @t1 table
(
Trans_type char,
Credit int,
Debit int,
CR_Value as (case when Trans_Type = 'C' then credit-debit else 0 end),
DB_Value as (case when Trans_Type = 'D' then debit-credit else 0 end)
)

Insert @t1 (Trans_Type, Credit, Debit) values
('C', 500, 100),
('C', 100, 200),
('D', 100, 300),
('D', 500, 100)

select * from @t1

select Trans_type, SUM(CR_Value), SUM(DB_VALUE)
from @t1
group by Trans_type



Give this a shot in SSMS and hopefully the same principles can be applied for Reporting Services.

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pietlinden
pietlinden
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you could add a calculated value to your dataset that did the calculation "row-wise" and then use that calculated value in your SUM / aggregate expression
pietlinden
pietlinden
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Group: General Forum Members
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you could add a calculated value to your dataset that did the calculation "row-wise" and then use that calculated value in your SUM / aggregate expression
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