An index is an ordered set of Pointers to rows in a base table.
索引是一个指向基础表的有序指针集。
An ordered collection of values where each value is identified by an integer index.
序列：一系列值的有序排列，每一个值都有一个唯一的整数序号。
An index is an ordered subset of the table on which it is created.
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.
索引是创建索引所基于的表的有序子集。
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