SQLServer 查詢所有外鍵關聯表信息

有時候需要清除一些數據，但是總會有一些外鍵關聯多加阻攔，下面是一些外鍵關聯查詢，方便更快捷有效的查詢到需要處理的外鍵信息。

一、外鍵信息

查詢列從左到右分別是： 外鍵約束名，子表名，外鍵列名，父表名

 --外鍵信息
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

二、外鍵被參考表

--外鍵被參考表
SELECT 主鍵列ID=b.rkey
,主鍵列名=(SELECT name FROM syscolumns WHERE colid=b.rkey AND id=b.rkeyid)
,外鍵表ID=b.fkeyid
,外鍵表名稱=object_name(b.fkeyid)
,外鍵名稱= c.name
,外鍵列ID=b.fkey
,外鍵列名=(SELECT name FROM syscolumns WHERE colid=b.fkey AND id=b.fkeyid)
,級聯更新=ObjectProperty(a.id,'CnstIsUpdateCascade')
,級聯刪除=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'

三、外鍵詳細信息

參考來源 http://technet.microsoft.com/zh-cn/library/ms190196(v=SQL.110).aspx

--外鍵詳細信息
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');

文章轉載自：https://www.cnblogs.com/guanshan/p/guan131.html