T-SQL基础教程Day2
摘要:
单表查询2.1 SELECT语句的元素SELECT empid, YEAR(orderdate) AS orderyear, COUNT(*) AS numordersFROM Sales.OrdersWHERE custid = 71GROUP BY empid, YEAR(orderdate)H 阅读全文
posted @ 2023-04-14 13:51 叶孤鸿 阅读(163) 评论(0) 推荐(0) 编辑