SQLServer：查询所有外键关联表信息

 --从左到右分别是： 外键约束名，子表名，外键列名，父表名

--use demodtcms
--外键信息
select fk.name fkname , ftable.name ftablename, cn.name fkcol, rtable.name ftablename,ObjectProperty(fk.id,'CnstIsUpdateCascade') updatCase,ObjectProperty(fk.id,'CnstIsDeleteCascade') deletCase from sysforeignkeys
join sysobjects fk
on sysforeignkeys.constid = fk.id
join sysobjects ftable
on sysforeignkeys.fkeyid = ftable.id
join sysobjects rtable
on sysforeignkeys.rkeyid = rtable.id
join syscolumns cn
on sysforeignkeys.fkeyid = cn.id and sysforeignkeys.fkey = cn.colid

--外键被参考表
SELECT 主键列ID=b.rkey
,主键列名=(SELECT name FROM syscolumns WHERE colid=b.rkey AND id=b.rkeyid)
,外键表ID=b.fkeyid
,外键表名称=object_name(b.fkeyid)
,外键名称= c.name
,外键列ID=b.fkey
,外键列名=(SELECT name FROM syscolumns WHERE colid=b.fkey AND id=b.fkeyid)
,级联更新=ObjectProperty(a.id,'CnstIsUpdateCascade')
,级联删除=ObjectProperty(a.id,'CnstIsDeleteCascade')
FROM sysobjects a
join sysforeignkeys b on a.id=b.constid
join sysobjects c on a.parent_obj=c.id
join syscolumns cn
on b.fkeyid = cn.id and b.fkey = cn.colid
where a.xtype='f' AND c.xtype='U'
and object_name(b.rkeyid)='dt_article'

--外键详细信息   来源 http://technet.microsoft.com/zh-cn/library/ms190196(v=SQL.110).aspx
SELECT
f.name AS foreign_key_name
,OBJECT_NAME(f.parent_object_id) AS table_name
,COL_NAME(fc.parent_object_id, fc.parent_column_id) AS constraint_column_name
,OBJECT_NAME (f.referenced_object_id) AS referenced_object
,COL_NAME(fc.referenced_object_id, fc.referenced_column_id) AS referenced_column_name
,is_disabled
,delete_referential_action_desc
,update_referential_action_desc
FROM sys.foreign_keys AS f
INNER JOIN sys.foreign_key_columns AS fc
ON f.object_id = fc.constraint_object_id
WHERE f.parent_object_id = OBJECT_ID('test');