[职称英语补全短文练习题]职称英语补全短文练习题Mobile PhonesMobile phones should carry a label if they proved1 to be a dangerous source of radiation, according to Robert Bell, a scienti...+阅读
13: D、存在重复的数据
14: D、能唯一标识元组的哪个属性
15: C、数据库管理系统
16: C、层次化数据库。
17: A、model
18: C、pubs
19: A、Pubs
20: B、.mdf
21: D、调试、执行sql语句, 批处理和脚本。
22: C、 使用数字数据类型时,可以改变长度信息。
23: D、decimal ( decimal(2,1),有效长度为2,小数位占1位。 )
24: A、一个
25: C、添加数据到一行中的部分列
26: C、DELETE
P.S: Northwind 和 pubs 都是示例数据库
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