标题: SQL HAVING 子句 [打印本页] 作者: vicky.yu 时间: 2020-8-6 14:56 标题: SQL HAVING 子句
SQL HAVING 子句
SQL Group By
SQL ucase()
HAVING 子句
在 SQL 中增加 HAVING 子句原因是,WHERE 关键字无法与合计函数一起使用。
SQL HAVING 语法
SELECT column_name, aggregate_function(column_name)
FROM table_name
WHERE column_name operator value
GROUP BY column_name
HAVING aggregate_function(column_name) operator value
SQL HAVING 实例
我们拥有下面这个 "Orders" 表:
O_Id OrderDate OrderPrice Customer
1 2008/12/29 1000 Bush
2 2008/11/23 1600 Carter
3 2008/10/05 700 Bush
4 2008/09/28 300 Bush
5 2008/08/06 2000 Adams
6 2008/07/21 100 Carter
现在,我们希望查找订单总金额少于 2000 的客户。
我们使用如下 SQL 语句:
SELECT Customer,SUM(OrderPrice) FROM Orders
GROUP BY Customer
HAVING SUM(OrderPrice)<2000
结果集类似: