试题详情单项选择题Which constraint can be defines only at the column level?()A、UNIQUEB、NOT NULLC、CHECKD、PRIMARY KEYE、FOREIGN KEY正确答案:B答案解析:关注下方微信公众号,在线模考后查看热门试题You are Given: Which tWhich two statementsGiven: What isWhat command In your dWhich business flow Which three elements You are pUsers are̳You are atIn Oracle̳Online indexWhich two statements Examine the&en There is A user is&Given: WhatistheresYou work Oracle JRockit