Select the first row by group

Select the first row by group

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Best use of R and SQL if restricted to a local machine

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R: how to rbind two huge data-frames without running out of memory

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Using sqldf and RPostgreSQL together

sql r postgresql sqldf rpostgresql

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SQL-like functionality in R

sql r sqldf

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How can I pass R variable into sqldf?

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Failed to connect the database when using sqldf in r

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sqldf: Changes timestamp from localtime to GMT/UTC

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