1. TOP 表达式 SQL Server 2000的TOP是个固定值,是不是觉得不爽,现在改进了。
-- 前n名的订单 declare @n int set @n = 10 select TOP ( @n ) * from Orders
2. 分页 不知各位过去用SQL Server 2000是怎么分页的,大多都用到了临时表。SQL Server 2005一句话就支持分页,性能据说也非常不错。 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没有异常,T-SQL必须逐行检查错误代码,对于习惯了try catch程序员,2005是不是更加亲切:
SET XACT_ABORT ON -- 打开 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. 通用表达式CTE 通过表达式可免除你过去创建临时表的麻烦。 --例子:结合通用表达式进行分页 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
6. 直接发布Web Service 这个比较酷,.NET, IIS都不需要了,通过Windows 2003的HTTP Protocol Stack直接发布WebService,用这个功能需要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/' )