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数据库表的字段可以定义默认值,默认值是( )。
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数据库表的字段可以定义默认值,默认值是( )。
A、逻辑表达式
B、字符表达式
C、数值表达式
D、前三种都可能
时间：2021-07-17 23:46
关键词：
能源与动力工程
专升本
VB程序设计
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D
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数据库表的字段可以定义默认值，默认值是
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