SQL Server 2005相對(duì)于SQL Server 2000改進(jìn)很大，有些還是非常實(shí)用的。舉幾個(gè)例子來簡(jiǎn)單說明 這些例子我引用了Northwind庫。

1. TOP 表達(dá)式

SQL Server 2000的TOP是個(gè)固定值，是不是覺得不爽，現(xiàn)在改進(jìn)了。

--前n名的訂單

declare @n int set @n = 10 select TOP(@n) * from Orders;

2. 分頁

不知各位過去用SQL Server 2000是怎么分頁的，大多都用到了臨時(shí)表。SQL Server 2005一句話就支持分頁，性能據(jù)說也非常不錯(cuò)。

--按Freight從小到大排序，求20到30行的結(jié)果

select * from(select OrderId, Freight, ROW_NUMBER() OVER(order by Freight) as row from Orders) a where row between 20 and 30;

3. 排名

select * from(select OrderId, Freight, RANK() OVER(order by Freight) as rank from Orders) a where rank between 20 and 30;

4. try ... catch

SQL Server 2000沒有異常，T-SQL必須逐行檢查錯(cuò)誤代碼，對(duì)于習(xí)慣了try catch程序員，2005是不是更加親切：

SET XACT_ABORT ON -- 打開 try功能 BEGIN TRY begin tran insert into Orders(CustomerId) values(-1) commit tran print 'commited' END TRY BEGIN CATCH rollback print 'rolled back' END CATCH;

5. 通用表達(dá)式CTE

通過表達(dá)式可免除你過去創(chuàng)建臨時(shí)表的麻煩。

--例子：結(jié)合通用表達(dá)式進(jìn)行分頁

WITH OrderFreight AS( select OrderId, Freight, ROW_NUMBER() OVER(order by Freight) as row from Orders ) select OrderId, Freight from OrderFreight where row between 10 and 20;

特別，通過表達(dá)式還支持遞歸。

6. 直接發(fā)布Web Service

想要把store procedure變成Web Service就用這個(gè)吧，.NET, IIS都不需要，通過Windows 2003的HTTP Protocol Stack直接發(fā)布WebService,用這個(gè)功能需要Windows 2003 sp1

--DataSet CustOrdersOrders(string customerID) CREATE ENDPOINT Orders_Endpoint state=started as http( path='/sql/orders', AUTHENTICATION=(INTEGRATED), ports=(clear) ) for soap( WebMethod 'CustOrdersOrders'( name='Northwind.dbo.CustOrdersOrders' ),

wsdl=default, database='Northwind', namespace='http://mysite.org/' );

Web Service就發(fā)布好了，敲入http://localhost/sql/orders?wsdl得到wsdl;