| Expert 2.5K+
P: 2,878
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Try this: - declare @IncomeTable table (yr int, mon varchar(2), income money, src varchar(10))
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insert into @IncomeTable values(2008, '06', 100.00, 'source1')
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insert into @IncomeTable values(2008, '06', 80.00, 'source2')
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insert into @IncomeTable values(2008, '06', 200.00, 'source1')
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insert into @IncomeTable values(2008, '06', 100.00, 'source2')
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select source1.yr, source1.mon, source1.source_income - source2.source_income
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from
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(select yr, mon, src, SUM(income) as source_income
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from @IncomeTable
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where src = 'source1'
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group by yr, mon, src) source1
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inner join
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(select yr, mon, src, SUM(income) as source_income
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from @IncomeTable
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where src = 'source2'
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group by yr, mon, src) source2 on
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source1.yr = source2.yr and source1.mon = source2.mon
-- CK
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