回想一下我们上周介绍的非常基本的构建块，它允许您获取1到10或1或100之间的随机数。

Recall that very basic building block we introduced last week which allowed you to grab a random number between 1 and 10 or 1 or a hundred.

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这样，你首先获取一个小于行数的随机数，然后根据这个便宜量使用limit得到结果。

So you pick a random number less than the number of results and use that as the offset in your LIMIT clause.

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