[单选题]删除模式时选择级联删除会有什么后果()A . 只是删除掉模式中的相关对象B . 所有依赖此模式的对象都会被删除C . 与普通的删除没有什么区别D . 会同时删除掉相关的系统信息
[单选题]SQL语言中,级联删除的短语是A.WHEN DELETE RESTRICTB.ON DELETE RESTRICTC.ON DELETE SET NULLD.ON DELETE CASCADE
[单选题]SQL语言中,级联删除的短语是( )。A.WHEN DELETE RESTRICTB.ON DELETE RESTRICTC.0N DELETE SET NULLD.0N DELETE CASCADE
[问答题] 什么是VC-4级联技术?
[单选题]SQL语言中,能正确实现级联删除的命令是A.ON DELETE CASCADESB.ON DELETE RESTRICTEDC.ON DELETE NULLIFIESD.ON DELETE DEFAULT
[问答题] 为什么在移动通信中经常采用级联码?它有什么主要特点?在经常采用的串行级联码中,内码c1=(n1,k1)和外码c2=(n2,k2)各采用什么类型码?
[单选题]SQL语言中,能正确实现级联删除的命令的是( )。A.ONDELETE CASCADESB.ONDELETE RESTRICTEDC.ONDELETE NULLIFIESD.ONDELETE DEFAULT
[单选题]在SQL语言中,能正确实现级联删除的命令是( )。A.ON DELETE CASCADESB.ON DELETE RESTRICTEDC.ON DELETE NULLIFIESD.ON DELETE DEFAULT
[单选题]在SQL语言中,能正确实现级联删除的命令是( )。A.ONDELETE CASCADESB.ONDELETE RESTRICTEDC.ONDELETE NULLIFIESD.ONDELETE DEFAULT
[单选题]级联又分为相邻级联和()。A . 连续级联B . 虚级联C . 无级联