Sql With as 用法

with
district as
(
    select  * from Area where AbbrTW= N'中國'
    union all
    select  a.* from Area a, district b
               where a.AreaNo like '2011%'
)
--district1 as
--(
--    select a.* from district a where a.AreaNo in (select AreaNo from district)   
--)
select * from district

参考网址：http://jc-dreaming.iteye.com/blog/772030