选择与MySQL的分组总结？
总而言之，请使用聚合函数SUM()。这样，使用MySQLGROUPBY进行分组。让我们首先创建一个表-
create table DemoTable -> ( -> ProductName varchar(20), -> ProductQuantity int, -> ProductPrice int -> );
使用插入命令在表中插入一些记录-
insert into DemoTable values('Product-1',2,50);
insert into DemoTable values('Product-2',3,80);
insert into DemoTable values('Product-2',4,100);
insert into DemoTable values('Product-1',4,150);使用select语句显示表中的所有记录-
select *from DemoTable;
+-------------+-----------------+--------------+ | ProductName | ProductQuantity | ProductPrice | +-------------+-----------------+--------------+ | Product-1 | 2 | 50 | | Product-2 | 3 | 80 | | Product-2 | 4 | 100 | | Product-1 | 4 | 150 | +-------------+-----------------+--------------+ 4 rows in set (0.00 sec)
以下是在MySQL分组选择查询-
select *,sum(ProductQuantity*ProductPrice) as Total from DemoTable -> group by ProductName;
+-------------+-----------------+--------------+-------+ | ProductName | ProductQuantity | ProductPrice | Total | +-------------+-----------------+--------------+-------+ | Product-1 | 2 | 50 | 700 | | Product-2 | 3 | 80 | 640 | +-------------+-----------------+--------------+-------+ 2 rows in set (0.00 sec)