超急sql的多分支有关问题~

超急啊~！！！sql的多分支问题~~~
请教大家一下sql的多分支怎么写啊？
select   Cxzb_nr,Cxzb_dw,Cxzb_dwxb   from   Cxzb   where  
case  
when   @jibie= '3 '   then   [email protected]
when   @jibie= '2 '   then   [email protected]
else   [email protected]
end

------解决方案--------------------
select Cxzb_nr,Cxzb_dw,Cxzb_dwxb from Cxzb where Cxzb_dw=
case
when @jibie= '3 ' then @danwei
when @jibie= '2 ' then @xuesh
else @www
end
------解决方案--------------------
--try

select Cxzb_nr,Cxzb_dw,Cxzb_dwxb from Cxzb where Cxzb_dw=
(case
when @jibie= '3 ' then @danwei
when @jibie= '2 ' then @xuesh
else @www
end)
and Cxzb_zw=
(case
when @jibie= '3 ' then @danwei
when @jibie= '2 ' then @xuesh
else @www
end)
------解决方案--------------------
改用动态SQL吧