所以，我们可以把 -1 看成一个常量输入，它的权系数 theta 在学习（或者用技术术语，称为 培训）的过程中进行调整。

So, it is possible to treat -1 as a constant input whose weight, theta, is adjusted in learning, or, to use the technical term, training.

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TLU通过改变它的权系数和阈值来学习。

A TLU learns by changing its weights and threshold.

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Wilson提供足够的SQL来帮助您学习如何在关系数据库中通知数据，并且他还涵盖了表格、连接、求反和嵌套查询。

Wilson provides enough SQL to help you learn how to massage data in a relational database, and he also covers tables, joins, negation, and nested queries.

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