查询与删除MSSQL中所有外键约束

查询：

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 

删除：

    declare @sql varchar(max),
 @tab_name varchar(),
 @fk_name varchar();
declare c cursor for
select OBJECT_NAME(parent_object_id), name from sys.objects where type='F'

open c
fetch next from c into @tab_name, @fk_name
while @@FETCH_STATUS=
begin
 set @sql='';
 set @sql='alter table ' + @tab_name + ' drop constraint ' + @fk_name
 print @sql
 exec(@sql)

 fetch next from c into @tab_name, @fk_name
end
close c
deallocate c

使用方法：

打开数据库，转到要操作的那一个库，执行上面的代码即可