Changes between Version 12 and Version 13 of normalization


Ignore:
Timestamp:
08/31/25 17:40:35 (2 days ago)
Author:
221046
Comment:

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  • normalization

    v12 v13  
    1717||'''Contact(contact_id, phone, fax, email)'''||contact_id||contact_id → {phone, fax, email}||BCNF||
    1818||'''Playlist(playlist_id, name)'''||playlist_id||playlist_id → name||BCNF||
    19 ||'''!PlaylistTrack(playlist_track_id, playlist_id, track_id)'''||playlist_track_id (и можен (playlist_id, track_id))||playlist_track_id → {playlist_id, track_id}; (playlist_id, track_id) → playlist_track_id||BCNF||
     19||'''!PlaylistTrack(playlist_track_id, playlist_id, track_id)'''||playlist_track_id (и можен (playlist_id, track_id))||playlist_track_id → {playlist_id, track_id}||BCNF||
    2020
    2121== Заклучок ==