【单选题】【消耗次数：1】
通过指定字段的数据类型与宽度来限制该字段的取值范围 , 这属于数据完整性中的
①
参照完整性
②
实体完整性
③
域完整性
④
字段完整性
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相关题目
【简答题】
关系模型的三类完整性约束是实体完整性、参照完整性和[填空1]。
【单选题】
要控制两个表中数据的完整性与一致性可以设置参照完整性,要求这两个表
①
就是同一个数据库中的两个表
②
不同数据库中的两个表
③
两个自由表
④
一个就是数据库表另一个就是自由表
【简答题】
参照完整性规则是对[填空]的约束。
随机题目
【单选题】
You’re better ____ from work tomorrow.
①
not be absent
②
not to absent
③
not to be absent
④
not absenting
【单选题】
He considered that the change would be ____ to his health.
①
healthy
②
available
③
profitable
④
beneficial
【单选题】
Mary will not be able to come to the birthday party as she is ____ with a cold.
①
laid out
②
laid up
③
laid by
④
laid down
【单选题】
A ____ language is one which is still spoken by people in the
course of their everyday lives.
①
living
②
live
③
lovely
④
alive
【单选题】
The ____ of beer and alcohol in New Zealand is very high.
①
consumption
②
use
③
drink
④
absorption
【单选题】
The woman murdered her friend and ______ to ______.
①
was sentenced , death
②
sentencing , die
③
sentenced , death
④
sentenced , die
【单选题】
_____ that we couldn’ t catch up with him.
①
So fast he ran
②
So fast did he run
③
So fast ran he
④
Such fast did he run
【单选题】
I am ____ grateful for the many kindnesses you have
shown my son.
①
excessively
②
much
③
certainly
④
exceedingly
【单选题】
His answer was so confused that I could hardly
make any ____ of it at all.
①
explanation
②
meaning
③
sense
④
interpretation