斯坦福大学sql练习（基础篇）

 这是斯坦福大学的公开课上关于sql数据库知识的基础测试，看看计算机顶尖学府是怎么出题的？真心有水平。 You've started a new movie-rating website, and you've been collecting data on reviewers' ratings of various movies. There's not much data yet, but y

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