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Select Salesman, SUM(CASE WHEN InvoiceDate Between '2015-9-1' and '2015-9-30' THEN Totsales else 0 end) as Sales15, SUM(CASE WHEN InvoiceDate Between '2016-9-1' and '2016-9-30' THEN Totsales else 0 end) as Sales16 from vCustomerInvoiceDetail Group by Salesman
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