Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement.

Right Join is used to join two tables and it return all rows from right table (table 2) and matching rows from table 1 (left table). The result is NULL for unmatched rows for table 1 (left table).

See how to join two data sets by one or more common columns using base R’s merge function, dplyr join functions, and the speedy data.table package.