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Reviewing the one-to-many join

You've done some great work on one-to-many joins with this data. While pausing to reflect, you overhear a conversation about joins coming from the next cubicle. Here are four statements you hear.

  • A. A one-to-many relationship exists when a column in one table matches many columns in another.
  • B. The .join() method works well when joining data frames by index.
  • C. One-to-many joins work best when both frames have unique values in one or more key columns.
  • D. The .merge() method can join a data frame with a list of data frames.

Which of these statements are TRUE?

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