例１：根据Northwind数据库，要求查询出每个员工最近的三条订单数据
1 with result
2 as
3 (
4 select row_number()over(partition by o.employeeID order by o.orderdate desc )as row ,e.lastName,e.FirstName,o.OrderID
5 from employees e join orders o on e.employeeID=o.employeeID
6 )
7
8 select * from result where row<=３
9
2 as
3 (
4 select row_number()over(partition by o.employeeID order by o.orderdate desc )as row ,e.lastName,e.FirstName,o.OrderID
5 from employees e join orders o on e.employeeID=o.employeeID
6 )
7
8 select * from result where row<=３
9