假设我有以下表格:
Class Student Maths English
------------------------------------
1 a 50 60
1 b - 60
2 c 70 50
2 d 40 -
我需要一个SQL查询来生成这个结果集:
Score Maths English Total
--------------------------------------
1 50 120 170
2 110 50 160
Grand Total 160 170 330
请帮忙。
答案 0 :(得分:3)
SELECT
Class,
sum(Maths) as Maths,
sum(English) as English,
sum(Maths+English) as Total
FROM
table
Group by
Class with Rollup
答案 1 :(得分:2)
我使用了看起来不那么优雅的联盟
create table the_table
(
class int,
student varchar(5),
maths int,
english int,
)
insert into the_table
values
( 1, 'a', 50, 60),
( 1, 'b', 0, 60),
( 2, 'c', 70, 50),
( 2, 'd', 40, 0)
select
[class] = convert(varchar(50),class)
, sum(maths) maths
, sum(english) english
, sum(maths + english) total
from the_table
group by
class
union
select
[class] = 'Grand Total'
, sum(maths) maths
, sum(english) english
, sum(maths + english) total
from the_table
答案 2 :(得分:1)
试试这个:
SELECT
ISNULL(Class, 'Grand Total') as Score,
sum(Maths) as Maths,
sum(English) as English,
sum(Maths) + sum(English) as Total
FROM
table
GROUP BY
ISNULL(Class, 'Grand Total')
WITH ROLLUP
请注意,这是T-SQL语法,可能需要对MySql或Oracle进行一些调整。