Similarly for any of the foreign key constraints which are many-to-one or many-to-many.Each month, over 50 million developers come to Stack Overflow to learn, share their knowledge, and build their careers.To have many actors belonging to many movies, you will need a seperate relations table.I have also found some great ER Diagram Examples using Lucidchart and their site is...Browse other questions tagged mysql database-design rdbms relationship or ask your own question.The role table would hold various positions - eg, director, producer, star, extra, grip, editor. and it would look more like.The physical ER model is normally developed to be instantiated as a database.

Case Sample: Cinema Application ER Diagrams ~ smartnoob

An entity-relationship diagram is a specialized graphic form that illustrates the relationships between entities in a database.You may use an auto increment key for ease of use in joins and such, but you should have a unique constraint on the uniqueness fields anyway.The first one was the film and it attributes or characteristics.Using a surrogate key (primary key) for tables is generally a good idea.Taking it a step further, sometimes directors are also actors, and vice-versa.

How to Draw E R Diagram Using MySQL Database Engine

IMDB provides flat-text files of their database (minus primary keys).The goal of the class project is to implement a database system application for a movie-.This Entity Relationship Diagram was made with Creately, diagramming and collaboration software.

(due February 25th, 2014, 3:30pm, in class—hard-copy please)

If there are multiple directors on a film, then you would have a separate table which would hold the primary key of the film table and the director table.While it can be good in some circumstances, it can be unnecessary in others (as generally it makes queries more complicated - you have to join everything - and it is slower).You have to make a distinction between attributes and entities.

Model Access Data Model using ERD What is an Entity Relationship Diagram.You need to insert in reverse order (and this is where auto increment keys can be an even bigger PITA - if you can add date of birth or something into the Actors and Directors table, then a unique constraint can make it easier).E-R Diagram for Hotel management system By Lankika Wijewardana.

Entity–relationship model - Wikipedia

For each actor in the film, you would add a row to the Actor-Film Index.Chapter 2 The En tit y-Relationship. er, the mo del is extremely. y-relationship diagram for the mo vie database The Movies en tit.

Each movie can be any number of genres (comedy and horror, for example).Thank you so much for your indepth responce Greg, much appreciated mate.

This can also include crew members (in case you want to track who the 2nd Junior Assistant Dolly Grip was).So rather than even have director and actor tables, you could have a single person table, and join that table in using a role table.In this case, having a year table is unnecessary, since there are no other attributes about a year, besides the year itself, that you would store.Instead of having a directors and actors table, just have one table of people.

Once this is set up, it is easy to query and find everything a given person has done, or everything a person has done as a director, or everyone who has ever directed a movie, or all the people involved with one specific movie.I realize your question has already been answered, however I wanted to point you to.It seems like what you need is more of a conceptual start here.Also, your genre, director, and actor tables need their own unique IDs.

Entity-Relationship Diagram Definition - ThoughtCo

It is better to denormalize this and store the year in the film table itself.By registering, you agree to the privacy policy and terms of service.You only need joining tables for many many relationships between entities that have direct relations -eg, films and genres.Your Films table also needs links to the genre, director, and actors tables.By posting your answer, you agree to the privacy policy and terms of service.

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