Mastering simple joins
Three new data.tables have been loaded into your R session containing information about the geography and population of Australia: area, capitals, and population. Your goal is to perform a sequence of joins to build a single data.table containing information about the geographical area of each Australian state and the population of its capital city, storing the final result in a new variable: australia_stats. There are three data.tables so you will need to perform two joins. First, you will join capitals and population, and then you will join the resulting data.table to the area.
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Joining Data with data.table in R
Interaktive Übung
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# Identify the key for joining capitals and population
capitals_population_key <- ___
# Left join population to capitals
capital_pop <- ___
capital_pop