In trying to insert into the playlist_track table, what is the cause of this error? Query failed because of: error: insert or update on table "playlist_track" violates foreign key constraint "playlist_track_playlist_id_fkey"     The playlist_id needs to be added to the playlist table first. The playlist_id in the playlist_track table doesn't exist yet. The playlist_id being referenced doesn't exist in the playlist table. The playlist_track_id is not unique

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Normalization

Normalization is the process of eliminating redundancy in a database by organizing the data into several smaller tables. The large tables are normalized (converted) into smaller tables by using normalization rules, so that a database administrator can easily handle them. It also eliminates insertion, deletion, and update anomalies.