Sql server 2005 找出子表树
同事在准备新老系统的切换，清空一个表的时候往往发现这个表的主键被另一个表用做外键，而系统里有太多层次的引用.所以清起来相当麻烦用下面这个脚本可以做到找出一个特定表的引用树，比如 table2 有个外键引用到了table1table3有个外键饮用到了table2.......
Code
declare @tbname nvarchar(256);
set @tbname=N'dbo.aspnet_Applications';
withfkids as
(
select
object_id(CONSTRAINT_NAME) as FkId,
object_id(UNIQUE_CONSTRAINT_NAME) AS PkId
from INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS
)
,realations as
(
select p.parent_object_id as pktableId
,f.parent_object_id as fktableid
,i.pkid,i.fkid
from
fkids i inner join sys.objects p on i.pkid=p.
inner join sys.objects f on i.fkid=f.
)
,cte as
(
select* from realations where pktableid=object_id(@tbname)
union all
select r.* from cte c join realations ron r.pktableid=c.fktableid
)
select
object_name(pktableid) as pktable
,object_name(fktableid) as fktable
,object_name(pkid) as pk
,object_name(fkid) as fk from cte
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