A, cooperate with computer operators to query the quantity of goods, and modify and maintain the barcode information of all goods in the supermarket.

B, according to the bar code rules to maintain the system commodity bar code, timely adjust the commodity price and promotion discount calculation formula.

C. maintain inventory information. Your work is fully qualified. There are few places to develop supermarket systems, and they are only maintained regularly or irregularly, but the salary is not ideal.