== Релациска шема ==
 - примарни клучеви - болдирани и подвлечени
 - надворешни клучеви - * до името на надворешниот клуч и во заграда табелата кон која референцира
 - not null атрибути: bold
 - Останати атрибути: без ознака
== Релации: ==
= Track =
 * __**track_id**__ (PK)
 * name*
 * album_id* (FK → Album)
 * media_type_id* (FK → !MediaType)
 * genre_id* (FK → Genre)
 * composer
 * milliseconds 
 * bytes 

= Album =
 * __**album_id**__ (PK)
 * title 
 * artist_id* (FK → Artist)

= Artist =
 * __**artist_id**__ (PK)
 * artist_name

= Genre =
 * __**genre_id**__ (PK)
 * genre_name 

= !MediaType =
 * __**media_type_id**__ (PK)
 * media_type_name 

= Price =
 * __**price_id**__ (PK)
 * value 
 * date 
 * track_id* (FK → Track)

= !InvoiceLine =
 * __**invoice_line_id**__ (PK)
 * invoice_id* (FK → Invoice)
 * track_id* (FK → Track)
 * unit_price
 * quantity 

= Invoice =
 * __**invoice_id**__ (PK)
 * customer_id* (FK → Customer)
 * invoice_date 
 * billing_address
 * billing_city
 * billing_state
 * billing_country
 * billing_postal_code
 * total 

= Customer =
 * __**customer_id**__ (PK)
 * customer_first_name 
 * customer_last_name 
 * company
 * support_rep_id* (FK → Employee)
 * contact_id* (FK → Contact)
 * address_info_id* (FK → !AddressInfo)

= Employee =
 * __**employee_id**__ (PK)
 * employee_first_name 
 * employee_last_name 
 * title
 * reports_to* (FK → Employee)
 * birth_date** 
 * hire_date** 
 * contact_id* (FK → Contact)
 * address_info_id* (FK → !AddressInfo)

= !AddressInfo =
 * _**address_info_id**__ (PK) 
 * address
 * city
 * state
 * country
 * postal_code

= Contact = 
 * __**contact_id**__ (PK)
 * phone
 * fax
 * email

= Playlist =
 * __**playlist_id**__ (PK)
 * name

= !PlaylistTrack =
 * __**playlist_track_id**__ (PK)
 * playlist_id* (FK → Playlist)
 * track_id* (FK → Track)

== DDL и DML скрипти: ==
 * [attachment:primary_ddl.sql DDL Скрипта]
 * [attachment:dml_insertions_1.sql DМL 1 Скрипта за пополнување на податоци во базата]
 * [attachment:dml_insretions_2.sql DМL 2 Скрипта за пополнување на податоци во базата]
 * [attachment:dml_insertion_3.sql​ DМL 3 Скрипта за пополнување на податоци во базата]

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