yaopin

代码说明：

  设计一系统，实现医药公司定期对销售各药品的记录进行统计，可按药品的编号、单价、销售量或销售额做出排名。(Design a system, the realization of pharmaceutical company on a regular basis to update a record of each drug sales statistics, according to the serial number of drugs, unit price, sales or sales rankings.)