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【单选题】
用交互方式创建表时,多个属性组合作为主键的操作是()。
A.
点击相关的每一个属性,为其设置主键
B.
按住Ctrl键,将相关属性选中再设置主键
C.
按住Shift键,将相关属性选中再设置主键
D.
按住Alt键,将相关属性选中再设置主键
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