I hope the above examples and analysis prove to be be helpful and serve as an introduction to SQL query tuning.

我希望上面的示例和分析证明是对您有所帮助的，并希望本文能充当SQL查询调优的简介。

youdao

Some notations are a bit outdated and it is mostly an introduction to real analysis that may be a bit too much as a first book.

有些注释有点过时，而且作为第一本书，对实分析的介绍可能有点过多了。

youdao

The following sections provide an introduction to data warehousing (excluding reporting and analysis).

下面的小节提供了对于数据仓库(除了报表制作和分析)的简介。

youdao