year salary
------------------ ---------------------
2000 1000
2001 2000
2002 3000
2003 4000
显示查询结果
year salary
------------------ ---------------------
2000 1000
2001 3000
2002 6000
2003 10000
即salary为以前年的工资的和
答案：
1 use northwind
2 go
3
4 select * from orders
5
6 select * from orders where orderDate between '1996-07-04' and '1996-07-20'
7
8 select * from orders where dateadd(day,500, orderDate)<getdate()
9 /*创建表和数据库*/
10 create database test
11 go
12 use test
13 go
14 create table Employee(
15 sId int identity (1,1) primary key,
16 [Year] datetime ,
17 Salary decimal
18 )
19 go
20 insert Employee values('2001',1000)
21 insert Employee values('2002',2000)
22 insert Employee values('2003',3000)
23 insert Employee values('2004',5000)
24 /*查询语句*/
25 select * from Employee
26 /*答案*/
27 select a.[year],sum(b.[salary]) from Employee as a,Employee as b where b.[year]<=a.[year] group by a.[year]
28
29
2 go
3
4 select * from orders
5
6 select * from orders where orderDate between '1996-07-04' and '1996-07-20'
7
8 select * from orders where dateadd(day,500, orderDate)<getdate()
9 /*创建表和数据库*/
10 create database test
11 go
12 use test
13 go
14 create table Employee(
15 sId int identity (1,1) primary key,
16 [Year] datetime ,
17 Salary decimal
18 )
19 go
20 insert Employee values('2001',1000)
21 insert Employee values('2002',2000)
22 insert Employee values('2003',3000)
23 insert Employee values('2004',5000)
24 /*查询语句*/
25 select * from Employee
26 /*答案*/
27 select a.[year],sum(b.[salary]) from Employee as a,Employee as b where b.[year]<=a.[year] group by a.[year]
28
29