试题详情单项选择题如果各类元组在表的主键上取值为空值,那么它违反了关系的()完整性约束。A、实体完整性B、引用完整性C、域完整性D、用户正确答案:A答案解析:关注下方微信公众号,在线模考后查看热门试题RMAN enablesA developer is creatYou work Examine the statemen想在另一个模式中创建表,用户最少应该具有Which statement addsIf you uWhich two statements You deployed&eYou set Which two̳ Observe the&enView the E注册Oracle目标数据库的命令是()。 Given that&ens Examine the structuIn user-manageA user w Examine the&enExaminethestructureo