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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

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