My apologies if this question has already been answered, but I haven't found it. I'll post all my ideas to solve it. The problem is that the database is large and my PC cannot perform this calculation (core i7 and 8 GB RAM). I'm using Microsoft R Open 3.3.2 and RStudio 1.0.136.My apologies if this question has already been
阅读背景：
在大型数据库中以R创建列
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