Even nowadays the data is made available as tab-delimited flat files. The key attribute is "id". The relational schema of this database is described as follow : MOVIES (id, title, yr, score, votes, director) ACTORS (id, name) CASTINGS (movieid, actorid, ord) DIRECTORS(id, name) Information from other properties (in particular, name) may be necessary for the description to be useful for disambiguation. are foreign keys respectively to ACTORS.id and MOVIES.id, defining referencial integrity constraints ACTORS and MOVIES. "actorid" references an actor in the relation ACTORS. There’s a lot of confusion about schemas when it comes to databases. The relationship ISDIRECTEDBY is translated by the inclusion of a foreign key (director) to DIRECTORS into the MOVIE table. Use PDF export for high quality prints and SVG export for large sharp images or embed your diagrams … references). IMDb started out as a flat-file database coupled with some Perl scripts that were shipped around on usenet. An additional type for the item, typically used for adding more specific types from external vocabularies in microdata syntax. The cardinality 1,1 between MOVIES and DIRECTORS may be read as "a movie is directed by one and only one director". © Computer Science Department - INT Evry. The ord attribute precise the rank of the actor in the movie. The entity ACTORS is translated to a relation ACTORS, with key "id" and attribute "name". Schema.org tools may have only weaker understanding of extra types, in particular those defined externally. ACTOR is used as a generic term and includes actresses. A short description of the item used to disambiguate from other, similar items. The key attribute is "id". actorid is a foreign key on ACTORS and movie id is a foreign key on MOVIES. (IMDb pre-dates the web by several years.) The relationship CASTINGS is translated to a relation CASTINGS with the attributes "actorid", "movieid" and "ord". eg. Is is a many-to-many relationships between MOVIES and ACTORS. A work that is a translation of the content of this work. Let us consider a database on movies and informations about (actors, directors and so on). the URL of the item's Wikipedia page, Wikidata entry, or official website. A CreativeWork or Event about this Thing. The identifier property represents any kind of identifier for any kind of, Indicates a page (or other CreativeWork) for which this thing is the main entity being described. The key attribute is "id". This database is inspired from the movie database. The relational schema of this database is described as follow : An actor is described by an identifier (integer, key of the table) and a name. Example/instance/realization/derivation of the concept of this creative work. This database is inspired from the movie database. The notion of schema is well-defined for relational databases. The principle of the translation between the entity relationship schema and the relational schema is the following : However, … actorid and movieid The cardinality 1,n between DIRECTORS and MOVIES may be read as "a director may have directed 1 to n movies". The version of the CreativeWork embodied by a specified resource. The relationship "CASTINGS" represents the set of actors' participations on movies. The question often arises whether there’s a difference between schemas and databases and if so, what is the difference. Consider the ER schema for the MOVIES database in Figure. A sub property of description. The paperback edition, first edition, or eBook. A director is identified by an id (integer, key of the table) and a name. Given the constraints shown in the ER schema, respond to the following statements with True, False, or Maybe. The three former types are categorized as “aggregation-oriented paradigms” because the object aggregations are prevalent over connections between objects (i.e. in tv, radio, movie, video games etc., or in an event. Organization or person who adapts a creative work to different languages, regional differences and technical requirements of a target market, or that translates during some event. It is a one-to-one relationship beteween MOVIES and DIRECTORS. "movieid" references a movie in the relation MOVIES. 西遊記 has an English workTranslation “Journey to the West”,a German workTranslation “Monkeys Pilgerfahrt” and a Vietnamese translation Tây du ký bình khảo. This is a relationship between something and a class that the thing is in. In RDFa syntax, it is better to use the native RDFa syntax - the 'typeof' attribute - for multiple types. Indicates a potential Action, which describes an idealized action in which this thing would play an 'object' role. E.g. The couple (actorid, movieid) is a key for the table. The cardinalities define precisely the semantic of the links between MOVIES, ACTORS, ISDIRECTEDBY, DIRECTORS and CASTINGS. Property Expected Type Description; Properties from Movie; actor: Person : An actor, e.g. The cardinality 1,n between MOVIES and ACTORS can be read as " a movie may have from 1 to n actors playing in". The entity DIRECTORS is translated to a relation DIRECTORS, with key "id" and attribute "name". The cardinality 1,n between ACTORS and CASTINGS may be read as "an actor may have played in 1 to n movies".

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