再求一条sql语句，代换字符,该怎么处理

再求一条sql语句，代换字符
假设有下表

ID Description Platform
1 aaa C
2 bbb W
3 ccc C
4 ddd W
5 eee W

要求写出sql语句，呈现这样的结果，凡是
platform是C的，打印出CS-(Description)
是W的，打印出WEB-(Description)
结果基本上是这样

CS-aaa
WEB-bbb
CS-ccc
WEB-ddd
WEB-eee

该怎样写呢？谢谢 


[解决办法]

SQL code

select case when Platform='C' then 'CS-'+Description            when Platform='W' then 'Web-'+Description endfrom tb
[解决办法]
SQL code
declare @t table (ID int,Description varchar(3),Platform varchar(1))insert into @tselect 1,'aaa','C' union allselect 2,'bbb','W' union allselect 3,'ccc','C' union allselect 4,'ddd','W' union allselect 5,'eee','W'select ID,C1+Description as Description from @t a left join (select 'CS-' AS C1 UNION SELECT 'WEB-') b on a.Platform=left(b.C1,1)/*ID          Description----------- -----------1           CS-aaa2           WEB-bbb3           CS-ccc4           WEB-ddd5           WEB-eee*/