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索引是一个指向基础表的有序指针集。
An index is an ordered set of Pointers to rows in a base table.
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索引是创建索引所基于的表的有序子集。
An index is an ordered subset of the table on which it is created.
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索引是创建索引所基于的表的有序子集。
An index is an ordered subset of the table on which it is created.
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