Accessing columns in data.table using a character vector of column names

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  3. Group by multiple columns and sum other multiple columns
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  7. Summarizing multiple columns with data.table
  8. How can one work fully generically in data.table in R with column names in variables
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  12. What does .SD stand for in data.table in R
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  14. data.table – select first n rows within group [duplicate]
  15. subsetting a data.table using != excludes NA too
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  17. Referring to data.table columns by names saved in variables
  18. Dynamic column names in data.table
  19. Merge rows in a dataframe where the rows are disjoint and contain NAs
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  21. Convert *some* column classes in data.table
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  23. Canonical tidyverse method to update some values of a vector from a look-up table
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