Релации:

Track

• track_id (PK)
• name (NOT NULL)
• album_id* (FK → Album)
• media_type_id* (FK → MediaType)
• genre_id* (FK → Genre)
• composer
• milliseconds (NOT NULL)
• bytes (NOT NULL)

Album

• album_id (PK)
• title (NOT NULL)
• artist_id* (FK → Artist)

Artist

• artist_id (PK)
• name (NOT NULL)

Genre

• genre_id (PK)
• name (NOT NULL)

MediaType

• media_type_id (PK)
• name (NOT NULL)

Price

• price_id (PK)
• value (NOT NULL)
• date (NOT NULL)
• track_id* (FK → Track)

InvoiceLine

• invoice_line_id (PK)
• invoice_id* (FK → Invoice)
• track_id* (FK → Track)
• quantity (NOT NULL)

Invoice

• invoice_id (PK)
• customer_id* (FK → Customer)
• invoice_date (NOT NULL)
• billing_address
• billing_city
• billing_state
• billing_country
• billing_postal_code
• total (NOT NULL)

Customer

• customer_id (PK)
• first_name (NOT NULL)
• last_name (NOT NULL)
• company
• support_rep_id* (FK → Employee)
• personal_info_id* (FK → AddressInfo)
• contact_id* (FK → Contact)

Employee

• employee_id (PK)
• first_name (NOT NULL)
• last_name (NOT NULL)
• title (NOT NULL)
• reports_to* (FK → Employee)
• birth_date (NOT NULL)
• hire_date (NOT NULL)
• personal_info_id* (FK → AddressInfo)
• contact_id* (FK → Contact)

AddressInfo

• address_info_id (PK)
• address (NOT NULL)
• city (NOT NULL)
• state
• country (NOT NULL)
• postal_code (NOT NULL)

Contact

• contact_id (PK)
• phone (NOT NULL)
• fax
• email (NOT NULL)

Playlist

• playlist_id (PK)
• name (NOT NULL)

PlaylistTrack

• playlist_track_id (PK)
• playlist_id* (FK → Playlist)
• track_id* (FK → Track)