我们可以在MySQL WHERE子句中使用SUM()函数的结果吗
我们可以在MySQL中使用HAVING子句而不是WHERE。让我们首先创建一个表-
create table DemoTable ( Name varchar(50), Price int );
使用插入命令在表中插入一些记录-
insert into DemoTable values('Chris',30);
insert into DemoTable values('David',40);
insert into DemoTable values('Chris',10);
insert into DemoTable values('Mike',44);
insert into DemoTable values('David',5);使用select语句显示表中的所有记录-
select *from DemoTable;
这将产生以下输出-
+-------+-------+ | Name | Price | +-------+-------+ | Chris | 30 | | David | 40 | | Chris | 10 | | Mike | 44 | | David | 5 | +-------+-------+ 5 rows in set (0.00 sec)
以下是在HAVING子句中使用SUM()函数的结果的查询-
select Name,SUM(Price) AS Total_Price from DemoTable group by Name having Total_Price > 40;
这将产生以下输出-
+-------+-------------+ | Name | Total_Price | +-------+-------------+ | David | 45 | | Mike | 44 | +-------+-------------+ 2 rows in set (0.03 sec)