试题详情简答题简述Oracle数据库角色的种类、作用,以及如何利用角色为用户授权。正确答案:Oracle数据库中角色分为系统预定义的角色和用户自定义的角色两类。角色是一系列权限的集合,可以先将权限授予角色,然后将角色授予具有相同权限的用户。答案解析:关注下方微信公众号,在线模考后查看热门试题During tablespYou are Given: WhatistheresGiven: What is You execute&en In your pThe Database John, a junior workClicktheExhibitbutto You are a You executed&e Consider the&eYou work Last night,Which two̳Given: Which t Examine the descripYou want to create tWhat view̳ Examine the structu