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1. For each genreId in the track table, display the genreid and the average milliseconds along with the overall average of all tracks in the

1. For each genreId in the track table, display the genreid and the average milliseconds along with the overall average of all tracks in the table.

2. Modify #1 to include another grouping within genreid to display the average milliseconds by albumid.

3. Display the playlistId and the number of tracks in that playlist for any playlist with at least 100 tracks.

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