题目详情

假设员工关系EMP(员工号,姓名,部门,部门电话,部门负责人,家庭住址,家庭成员,成员关系)如下表所示。如果一个部门可以有多名员工,一个员工可以有多个家庭成员,那么关系EMP属于(  ),且(  )问题;为了解决这一问题,应该将员工关系EMP分解为(  )。
中级软件设计师,历年真题,2009年上半年(上午)《软件设计师》真题
问题1
A.1NF
B.2NF
C.3NF
D.BCNF
问题2
A.无冗余、无插入异常和删除异常
B.无冗余,但存在插入异常和删除异常
C.存在冗余,但不存在修改操作的不一致
D.存在冗余、修改操作的不一致,以及插入异常和删除异常
问题3
A.EMP1(员工号,姓名,家庭住址) EMP2(部门,部门电话,部门负责人) EMP3(员工号,家庭成员,成员关系)
B.EMP1(员工号,姓名,部门,家庭住址) EMP2(部门,部门电话,部门负责人) EMP3(员工号,家庭成员,成员关系)
C.EMP1(员工号,姓名,家庭住址) EMP2(部门,部门电话,部门负责人,家庭成员,成员关系)
D.EMP1(员工号,姓名,部门,部门电话,部门负责人,家庭住址) EMP2(员工号,家庭住址,家庭成员,成员关系)

正确答案及解析

正确答案
ADB
解析
暂无解析

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