Group by calculation

Question

select
802 as acct1, 803 as acct2,100 as amt1 ,-100 as amt2
into #Acct
Insert INTO #Acct
select 802,803,100,-100
UNION ALL
select 803,802,-100,100
UNION ALL
select 803,802,-100,100
UNION ALL
Select 803,802,-100,100
Hi,
I inserted the sample data as sql,
I have acct1 and acct2 with amounts, I need output like this
Acct1   Amount
802     500 (from both amount fields)
803     -500(from both amount fields)
i can do this by using self join , but this table has million records, please give me a better solution

Answer 1

if have mutiple column associated to the accounts and needs to calculate the same way
You can extend the same solution for multiple columns
ie like
SELECT amt,
SUM(field1) AS field1,
SUM(field2) AS field2,
SUM(field3) AS field3,
FROM Tablename t
CROSS APPLY (VALUES (amt1,field11,field21,field31,..),
(amt2,field12,field22,field32,..),
)tmp(amt,field1,field2,field3,..)
GROUP BY amt
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