Both can specify an index operator class and both can be sorted in ascending or descending order.

这两种索引都可以指定索引操作符类并按照降序或升序排列。

youdao

For each column you select, indicate whether the index arranges values of this column in ascending or descending order.

针对每个选取的资料行，指示索引是要以递增或递减顺序排列此资料行的值。

youdao

If you could walk through the entries in an index, you would see that they are in order, usually ascending, but since 8i, descending also works.

如果你深入一个索引的各项，会看到他们是有序的，通常升序，但从8i开始，也可以降序。

youdao