Question

i write this query using t-sql and give me an error (Incorrect syntax near the keyword ‘OR’)
How to write it in correct way ?

SELECT SUM(Quantity) 
  FROM   Invoices
 WHERE  Invoices.InvoiceDocStatusID = 
        CASE @InventoryType
                      WHEN 1 
                      THEN ((2)OR(1))
                      ELSE 2
                    END

Answer 1

Not really that certain of the desired semantics. Do you always want rows matching InvoiceDocStatusID=2 regardless of the value of @InventoryType and additionally want InvoiceDocStatusID=1 where @InventoryType = 1?

SELECT SUM(Quantity) 
  FROM   Invoices
 WHERE  (Invoices.InvoiceDocStatusID = 1 AND @InventoryType = 1)
OR Invoices.InvoiceDocStatusID = 2