sample150.sql

T-SQL示例大全

/* 文件名称: Sample150.sql */
USE 北风贸易

SELECT a.公司名称,
       COUNT(DISTINCT b.订单号码) AS 采购次数,
       SUM(c.单价 * c.数量 * (1 - c.折扣)) AS 采购总金额
  FROM 客户 a 
       INNER JOIN 订货主档 b ON a.客户编号 = b.客户编号
       INNER JOIN 订货明细 c ON b.订单号码 = c.订单号码
  GROUP BY a.公司名称