if object_id('[ta]')isnotnull
droptable[ta]
go
createtableta([id]int,[name] nvarchar(4),[parentid] nvarchar(2))
go
insertintota
select1,'河北省','0'unionall
select2,'邢台市','1'unionall
select3,'石家莊市','1'unionall
select4,'張家口市','1'unionall
select5,'南宮','2'unionall
select6,'壩上','4'unionall
select7,'任縣','2'unionall
select8,'清河','2'unionall
select9,'河南省','0'unionall
select10,'新鄉市','9'unionall
select11,'aaa','10'unionall
select12,'bbb','10'
go
--start
;withdistrict
as
(select*fromtawhere[name]=n'河北省'
unionall
selecta.*fromta a,district bwherea.parentid=b.id
)
select*fromdistrict
--result:
/*
idnameparentid
----------- ---- --------
1 河北省 0
2 邢台市 1
3 石家莊市 1
4 張家口市 1
6 壩上 4
5 南宮 2
7 任縣 2
8 清河 2
*/
上面**可以還不夠清晰 給多乙個例子
with district
--查詢列
(pid, fdepartmentname,fstate, ffathername) as
--父表
(select pid, fdepartmentname,fstate,convert(nvarchar(50), '') as ffathername from dbo.t_department where (fparentuserid is null or fparentuserid=0)
union all
--子表(注意是b的fdepartmentname)
select a.pid, a.fdepartmentname,a.fstate,b.fdepartmentname as ffathername from dbo.t_department as a
--關係
inner join district as b on a.fparentuserid = b.pid)
--查詢
select pid, fdepartmentname,fstate, ffathername
from district as c
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