本文探讨了数据库系统中的项目性和投影的概念。项目性是衡量元组被读取的比例，而投影则是关于预测未来数量的能力，常用于数据估计和电影放映。文章引用了《现代列式数据库系统的设计与实现》作为参考来源，深入理解这些概念对于数据库管理和数据分析至关重要。
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Overview
From [1], projectivity is percentage of a tuple that is read.
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Projectivity
From collins, it means the capacity for projection.
projection:
- countable noun: a projection is an estimate of a future amount
- uncountable noun: The projection of a film or picture is the act of projecting it onto a screen or wall
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References
- The Design and Implementation of Modern Column-Oriented Database System
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