SQL的范例是，用户（或应用程序）只需告诉数据库系统要 做什么，系统自己就会得出如何做 这件事的最佳方法。
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.
SQL的范例是，用户（或应用程序）只需告诉数据库系统要 做什么，系统自己就会得出如何做 这件事的最佳方法。
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.
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