在指定字段或表达式中不允许出现重复值的索引是( )。
A.惟一索引
B.惟一索引和候选索引
C.惟一索引和主索引
D.主索引和候选索引
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正确答案: D 答案分析:无
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A.惟一索引
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B.惟一索引和候选索引
C.惟一索引和主索引
D.主索引和候选索引
A.惟一索引
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B.惟一索引和候选索引
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B.惟一索引和候选索引
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D.主索引和候选索引
A.惟一索引
B.惟一索引和候选索引
C.惟一索引和主索引
D.主索引和候选索引
A.惟一索引
B.惟一索引和候选索引
C.惟一索引和主索引
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