How does the cashier check the consumption records of members in the past few months?

Supermarkets are generally more than one year. Supermarket consumption records will not be kept permanently, after all, data also takes up memory. Supermarket generally refers to a store where goods are publicly displayed, customers choose their own goods, queue up for cashier settlement, and mainly engage in fresh food, fruits and daily necessities. Self-help shopping, unified cashier settlement retail enterprises. In China, supermarkets were introduced by 1978, then called supermarkets.