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2. dplyr - Wikipedia

   en.wikipedia.org/wiki/Dplyr

   dplyr is an R package whose set of functions are designed to enable dataframe (a spreadsheet-like data structure) manipulation in an intuitive, user-friendly way. It is one of the core packages of the popular tidyverse set of packages in the R programming language . [ 1 ]

3. Comparison of programming languages (string functions)

   en.wikipedia.org/wiki/Comparison_of_programming...

   String functions are used in computer programming languages to manipulate a string or query information about a string (some do both).. Most programming languages that have a string datatype will have some string functions although there may be other low-level ways within each language to handle strings directly.

4. Select (SQL) - Wikipedia

   en.wikipedia.org/wiki/Select_(SQL)

   Previous Page: sort the data in the reverse order, select only the first {rows} rows, where the {unique_key} is less than {first_val} (the value of the {unique_key} of the first row in the current page), and sort the result in the correct order