R - Inner, Outer, Left & Right Joins using Merge
Using R, I show how to use merge for multiple joins.
An inner join of two data frames: Return only the rows in which the left table has matching keys in the right table.
An outer join: Returns all rows from both tables, joining records from the left which have matching keys in the right table.
Left outer join (left join): Return all rows from the left table, and any rows with matching keys from the right table.
Right outer join (right join): Return all rows from the right table and any rows with matching keys from the left table.
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