database - SQL, Change the number value of a field. In Visual basic -


im programming business application part of assignment , ran across problem have never had face before.

im wondering possible update value of field quantityonhand in statement without grabbing first statement , assigning variable.

google turning nothing im looking for, thanks!

        cmd = new oledbcommand("update inventory set quantityonhand = ? productid = ?", con)          prm = new oledbparameter("quantityonhand ", )         cmd.parameters.add(prm)          prm = new oledbparameter("productid ", "003")         cmd.parameters.add(prm)          cmd.executenonquery()

the other answer pretty poor. wisety used parameters, embed expression in sql:

update inventory set quantityonhand = (quantityonhand  + ?) productid = ?

pass positives increase, negative vals decrease


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