某企业开发信息管理系统平台进行E-R图设计，人力部门定义的是员工实体具有属性：员工号、姓名、性别、出生日期、联系方式和部门,培训部门定义的培训师实体具有属性:培训师号，姓名和职称，其中职称={初级培训师，中级培训师，高级培训师},这种情况属于(作答此空)，在合并E-R图时，解决这一冲突的方法是()
- A.属性冲突
- B.结构冲突
- C.命名冲突
- D.实体冲突
正确答案及解析
正确答案
解析
ER图集成时产生的冲突及解决办法属性冲突：包括属性域和属性取值的冲突。命名冲突：包括同名异义和异名同义。结构冲突：包括同一对象在不同应用中具有不同的抽象，以及统一实体在不同的局部E-R图中所包含的属性个数和属性排列次序不完全相同。本题中，培训师属于员工的一种，所以不应该抽象为两个不同的实体，这种冲突属于结构冲突，解决方案是员工实体中加入职称属性，然后把培训教师实体删除。
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