Exercise

Multi-column keys

Two new datasets are available in your R session:

subjects: contains the subject each student is taking each semester this year
locations: contains the room allocations for each subject

Your goal is to build a new data.table with the locations of each subject for each student.

Instructions 1/3

undefined XP

1

2

3

Right join locations to subjects using the "subject" and "semester" columns in both data.tables as two separate join key columns. You should get an error.

.css-6su6fj{-webkit-flex-shrink:0;-ms-flex-negative:0;flex-shrink:0;}Exercise

Instructions 1/3

Exercise