--表的外鍵約束

SELECT 外鍵表ID=b.fkeyid
	,外鍵表名稱=object_name(b.fkeyid)
	,外鍵列ID=b.fkey
	,外鍵列名=(SELECT name FROM syscolumns WHERE colid=b.fkey AND id=b.fkeyid)
	,主鍵表ID=b.rkeyid
	,主鍵表名=object_name(b.rkeyid)
	,主鍵列ID=b.rkey
	,主鍵列名=(SELECT name FROM syscolumns WHERE colid=b.rkey AND id=b.rkeyid)
	,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
where a.xtype='f' AND c.xtype='U'


--查詢一個表的所有外鍵:

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
where a.xtype='f' AND c.xtype='U'
	and object_name(b.rkeyid)='titles'