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Exercise

Performing a semi join

Some of the tracks that have generated the most significant amount of revenue are from TV-shows or are other non-musical audio. You have been given a table of invoices that include top revenue-generating items. Additionally, you have a table of non-musical tracks from the streaming service. In this exercise, you'll use a semi join to find the top revenue-generating non-musical tracks..

The tables non_mus_tcks, top_invoices, and genres have been loaded for you.

Instructions

100 XP
  • Merge non_mus_tcks and top_invoices on tid using an inner join. Save the result as tracks_invoices.
  • Use .isin() to subset the rows of non_mus_tck where tid is in the tid column of tracks_invoices. Save the result as top_tracks.
  • Group top_tracks by gid and count the tid rows. Save the result to cnt_by_gid.
  • Merge cnt_by_gid with the genres table on gid and print the result.