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table1 table3有个外键饮用到了table2 .......
Code
declare @tbname nvarchar(256);
set @tbname=N'dbo.aspnet_Applications';
with fkids 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.[object_id]
inner join sys.objects f on i.fkid=f.[object_id]
)
,cte as
(
select * from realations where pktableid=object_id(@tbname)
union all
select r.* from cte c join realations r on 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
posted on 2008-11-18 23:29
Tianjon 阅读(1393)
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SQL SERVER 2005