在物理数据模型中避免外部连接。

Avoid Outer Joins in the Physical Data model.

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在建立外部连接前，服务器可以要求登录。

Before an outside connection is made, the server can request a login.

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外部连接可能会对查询性能产生负面影响。

Outer joins may have a negative impact on query performance.

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So it's some way of interfacing activity in your brain with the outside world, and we'll talk about this as we go along, but there's lots of reasons to think that we're going to have this in the not too distant future.

它是一种将大脑,和外部世界连接起来的办法,当我们遇到这个问题的时候再细讲,但我们非常有理由相信,不远的将来我们就能应用这些技术

耶鲁公开课 - 生物医学工程探索课程节选