Since both LASTNAME and DEPTNO are part of the index, we will get index-only access.

因为LASTNAME和DEPTNO都是索引的一部分，我们将获得仅限索引的访问。

youdao

Keep in mind that making every query an index-only access is not prudent or even possible.

请记住：使每个查询成为仅索引访问是不谨慎，甚至也是不可能的。

youdao

The option can be used in non matching index scans in a screening fashion and as part of index-only access.

该选项以筛选的方式用于非匹配索引扫描，且是仅索引访问的一部分。

youdao

As we've seen systematically in the don't-takes, the only thing that gets changed is the index.

当我们系统的看这些,不应该装的物品时，唯一改变的是索引值。

麻省理工公开课 - 计算机科学及编程导论课程节选

His conclusion: from 1998-2010 the index returned only 2.1% annualized on a money-weighted basis, not 7.3%.

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Of the seven currencies that make up the Federal Reserve's major-currency index, only one (the Australian dollar) is within 10% of its fair value.

ECONOMIST: The Big Mac Index

Of the 20 cities tracked by the Case-Shiller index, only New York saw a moderate fall in house prices since a year earlier, down 1.2%.

BBC: US housing recovery gains steam