mooc人大单元测试4
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1
单选(2分)
在数据库系统中，保证数据及语义正确和有效的功能是（ ）。
得分/总分
A.
并发控制
B.
存取控制
C.
安全控制
D.
完整性控制
2.00/2.00
正确答案：D你选对了
解析： D、知识点：实体完整性定义、检查和违约处理
2
单选(2分)
在数据库的表定义中，限制成绩属性列的取值在0到100的范围内，属于数据的（ ）约束。
得分/总分
A.
实体完整性
B.
参照完整性
C.
用户自定义完整性
2.00/2.00
D.
用户操作
正确答案：C你选对了
解析： D、知识点：用户定义的完整性
3
单选(2分)
有一个关系：学生（学号，姓名，系别），规定学号的值域是8个数字组成的字符串，这一规则属于（ ）。
得分/总分
A.
实体完整性约束
B.
参照完整性约束
C.
用户自定义完整性约束
2.00/2.00
D.
关键字完整性约束
正确答案：C你选对了
解析： D、知识点：用户定义的完整性
4
单选(2分)
关于主键约束以下说法错误的是（ ）。
得分/总分
A.
一个表中只能设置一个主键约束
B.
空值的字段上不能定义主键约束
C.
空值的字段上可以定义主键约束
2.00/2.00
D.
可以将包含多个字段的字段组合设置为主键
正确答案：C你选对了
解析： D、知识点：实体完整性定义、检查和违约处理
5
多选(2分)
实体完整性规则检查的内容包括（ ）。
得分/总分
A.
检查主码的各个属性值是否为空，只要有一个为空就拒绝插入或修改
1.00/2.00
B.
检查主码的各个属性值是否唯一，只要有一个不唯一就拒绝插入或修改
C.
检查主码值是否唯一，如果不唯一就拒绝插入或修改
1.00/2.00
D.
检查主码值是否唯一，如果唯一就拒绝插入或修改
正确答案：A、C你选对了
解析： D、知识点：实体完整性定义、检查和违约处理
6
多选(2分)
数据库的完整性是指数据的（ ）。
得分/总分
A.
实体完整性
0.67/2.00
B.
参照完整性
0.67/2.00
C.
用户定义完整性
0.67/2.00
D.
安全完整性
正确答案：A、B、C你选对了
解析： D、知识点：实体完整性定义、检查和违约处理
7
判断(2分)
数据的完整性是保护数据库，防止恶意破坏和非法存取。（ ）
得分/总分
A.
B.
2.00/2.00
正确答案：B你选对了
解析：知识点：实体完整性定义、检查和违约处理
8
判断(2分)
对参照表插入元组时，一旦违背了参照完整性约束，则拒绝插入元组。（ ）
得分/总分
A.
2.00/2.00
B.
正确答案：A你选对了
解析：知识点：参照完整性定义、检查和违约处理
9
判断(2分)
触发器不仅可以定义在基本表上，也可以定义在视图上。（ ）
得分/总分
A.
B.
2.00/2.00
正确答案：B你选对了
解析：知识点：触发器的定义、激活和删除
