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How to use If condition in Joins

Posted By:      Posted Date: September 01, 2010    Points: 0   Category :Sql Server
Hello, I have three tables in which two are reference tables and one main transaction table. tblRef_ProcedureCode tblRef_MainCode tblTrans_OPCustomer I have two columns in the Transaction table i.e. Proc_Code, Main_Code. I have to get the tariff information against these two codes from the reference tables. I want to join the main transaction table with reference tables on the basis of the following conditions. If tblTrans_OPCustomer.proc_code = tblRef_ProcedureCode.proc_code then get the tariff from tblRef_ProcedureCode (No need to check Main code) If tblTrans_OPCustomer.proc_code <> tblRef_ProcedureCode.proc_code then get the tariff from tblRef_MainCode How could I do this in Join conditions? Many thanks.

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