Exercise

Checking for duplicate keys

The team is debating whether or not two datasets can be joined. The question comes down to whether or not each data frame has a unique set of one or more key columns.

You'll be going back to two data frames from before, game_matchups and punts. In an earlier exercise you determined there was a one-to-many relationship between the data frames.

Instructions 1/3

XP

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View the first 5 rows of game_matchups and check for uniqueness of the key column.

Take Hint (-10 XP)