系统主要以一电脑公司进销存管理为基本要求，主要功能包括对各个数据表的查询和维护，进货、销售、退货登记，对各个厂商进货总额、顾客购买总额、商品销售量、商品退货量、业务员业绩及薪金的排行和一些报表分析。-System is mainly a computer company, Purchase, Sales and Inventory Management for the basic requirements, the main features include data tables for ea