Creating SumIf function in SQL Server 2012 -


i need building sql server function acts sumif in excel, example 

sumif(fees.fee_amount, fees.type ='services' , fees.fee_code = 'b01')

so item summed if fees.fee_amount , part fees.type ='services' , fees.fee_code = 'b01'

syntax sumif(tablename.columnname, criteria), function return total.

the simplest way sum case clause, so:

sum(case when fees.type ='services' , fees.fee_code = 'b01'          fees.fee_amount     end) columnalias,

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