--返回每個雇員處理過的訂單的最近日期.--select empid, max(orderdate) as maxorderdate from sales.orders group
by empid
--封裝上面的結果集, 並和order表連線, 為每個雇員返回其訂單日期最近的訂單資訊.
/*with t as (
select empid, max(orderdate) as maxorderdate from sales.orders group
by empid
)select t.empid, t.maxorderdate, o.orderid, o.custid
from t inner
join sales.orders o on t.empid=o.empid and o.orderdate=t.maxorderdate
*/--為每個訂單按照orderdate, orderid的順序來計算其行號.
--select orderid, orderdate, custid, empid, row_number() over(order
by orderdate, orderid) rownum
--from sales.orders
/*with t as (
select orderid, orderdate, custid, empid, row_number() over(order
by orderdate, orderid) rownum
from sales.orders
)select * from t where rownum>10 and rownum<=20
*/--使用cte遞迴來設計乙個解決方案, 返回領導id為9 的管理鏈.
/*with t as (
select empid,mgrid,firstname,lastname from hr.employees where empid=9
union
allselect e.empid,e.mgrid,e.firstname,e.lastname from hr.employees e inner
join t on e.empid=t.mgrid
)select * from t
*/--返回每個雇員每年處理的總訂貨量
/*create
view [dbo].[v_1]
asselect
top (100) percent sales.orders.empid, year(sales.orders.orderdate) as orderyear, sum(sales.orderdetails.qty) as totalqty
from sales.orderdetails inner
join
sales.orders on sales.orderdetails.orderid = sales.orders.orderid
group
by sales.orders.empid, year(sales.orders.orderdate)
order
by sales.orders.empid, orderyear
*/--使用上面這個檢視, 返回每個雇員每年處理過的連續總訂貨量
select *,(select
sum(totalqty) from v_1 v1 where v1.empid=v2.empid and v1.orderyear<=v2.orderyear) from dbo.v_1 v2
order
by empid,orderyear
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