contestada

A personal music database stores details of a personal music library, and can be used to manage your MP3, CD, or vinyl collection. Because this database is for a personal collection, it’s relatively simple and stores only the relationships between artists, albums, and tracks.

Key requirements for the database:

The collection consists of albums.

An album is made by one or more artists.

An artist makes one or more albums.

An album contains one or more tracks

Artists, albums, and tracks each have a name.

Each track is on exactly one album.

Each track has a time length, measured in seconds.

When a track is played, the date and time the playback began (to the nearest second) should be recorded; this is used for reporting when a track was last played, as well as the number of times music by an artist, from an album, or a track has been played.

There’s no requirement to capture composers, group members or sidemen, recording date or location, the source media, or any other details of artists, albums, or tracks.

1.a) For the above problem, draw an entity relationship diagram with appropriate cardinalities (including lower and upper bounds) associated with the relationships. (20 points)

1.b) Based on the entity relationship diagram, create a relational model (in 3rd normal form). Identify any needed primary and foreign keys and draw the relationship lines between the specific attributes in each entity that are associated with the relationship.

Respuesta :

temmydbrain

Answer:

Check the explanation

Explanation:

Step 1: identify the entitles

From the statement given, the given entitles are artists, albums, tracks and played.

Step 2: identify the relationships

  1. One artist can make many albums
  2. One album can contain many tracks
  3. One track can be played many times.

Conversely, each play is associated with one track, a track is on one album, and an album is by one artist.

Step 3: identify the key attributes

The only strong entity in the database would be the “artist”, which has an attribute of artist ID so as to uniquely identifies it

Each album entity is uniquely identified by its album combined with the artist ID of the corresponding artist entity.

A track entity is similarly uniquely identified by its track ID combined with the related album ID and artist ID attributes.

The played entity is uniquely identified by a combination of its played time, and the related track ID attributes.

Step 4: identify other relevant attributes:

The attributes are straight forward; artist, albums, and track have names as well as identifiers to uniquely identify each entity. The track entity has a time attribute to solve the duration and the played entity has a timestamp to store when the track was played.

Step 5: Draw a complete ER diagram

The diagram explaining this question can be seen in the attached image below:

Ver imagen temmydbrain

The entity-relationship diagram will consist of the artists, albums, tracks played.

What is an entity-relationship diagram?

An entity-relationship diagram is a graphical representation which show the relationships among people, objects, places, etc within an information technology system.

The following are important for the diagram:

  • An artist can make many albums.
  • An album can contain many tracks.
  • A track can be played many times.

The strong entity in the database would be the artist and each album entity is uniquely identified by its album.

Also, the track entity is identified by its track ID combined with the related album ID and artist ID attributes.

Learn more about  entity-relationship diagram on:

https://brainly.com/question/6717408

Otras preguntas