The paradigm of SQL is that the user (or application) just tells the database system what to do and the system itself figures out the best way how to do it.
2
由于大多数人都熟悉商品关系数据库系统，将数据仓库与之比较，就容易理解什么是数据仓库。
Since most people are familiar with commercial relational database systems, it is easy to understand what a data warehouse is by comparing these two kinds of systems.
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