Number of entity types involved in a relationship type. Types of attributes simple vs composite, single-value vs multi-value, stored vs derived Students ID gpa name fname minit lname hobby bdate age The set of values the attribute may take. Address Name Qty PID Order Product Customer ID Date Relationship Type A definition of a collection of relationships with the identical set of attributes. cf) Class Students ID name schoolġ0 Relationship Relationship Relationship TypeĪn association between two or more entities (usually of different types). Realized as Tuple or Record cf) Object Entity Type A definition of a collection of entities with identical set of attributes. Each entity is described by a set of attributes (or properties). Proposed by Peter Chen in 1976 Historically very popular Graphical Major concepts: entity type, relationship type, attribute, constraints, …Įntity-Relationship Diagrams Three principal components Entity set (= class), Entity (= object) Attributes Relationship has one name in both directions can involve more than two entity setsĪ real-world object distinguishable from other objects.
Movie er data model how to#
It is easier to set up a good model (focus on data content not structure) Flexible (system independent) How to describe a conceptual design? Use an ER Diagram (most popular), ODL There are doctors, patients, nurses, prescriptions, tests, … Each doctor has ID, Name, Specialty, Age, Sex, … Patients see doctors, doctors prescribe drugs to patients, … Each patient has one primary care physician, a nurse is assigned to at most 5 patients, …Ħ Conceptual Design Design a high level schema based on user requirements Why do we do a conceptual design? To communicate with domain experts (use concepts of the application domain). Interviews and/or Q&A Application specific Time consuming Very important Difficult to be thoroughĥ A Sample Requirement Consider a regional hospital. Real-world domain Database design model (Conceptual) (ERD, ODL) DBMS data model (Logical) (relational, OO, OR) Design-to-DBMS step may be automated (e.g., ER-to-relational) Middle step sometimes skipped (directly to relational model)Ĥ Requirement Analysis Need to interact with domain experts Define the schema using the DDL of the DBMS Database creation. Refine a conceptual design to a schema using the data model of a DBMS Physical design. Specify a high level schema using a database design model Logical design.
Specify what need to be modeled in a real-world domain Conceptual design. Steps in building a database for an application Requirement analysis.
Movie er data model movie#
We have implemented indexing on each tables of Movie Library Management System tables for fast query execution.1 The Entity-Relationship Diagram for Data Modeling.All the entities Movie Library, User, Movie, Login are normalized and reduce duplicacy of records.There is one-to-one and one-to-many relationships available between User, Shows, Login, Movie Library.The entity Movie, User has binded with Movie Library, Movie Type entities with foreign key.Each entity (Login, Movie, User, Movie Type, Movie Library) contains primary key and unique keys.The details of Movie Library is store into the Movie Library tables respective with all tables.Login Entity : Attributes of Login are login_id, login_user_id, login_role_id, login_username, login_password, login_lastloginĭescription of Movie Library Management System Database :.User Entity : Attributes of User are user_id, user_name, user_mobile, user_email, user_username, user_password, user_address.Shows Entity : Attributes of Shows are show_id, show_name, show_type, show_time, show_date, show_description.
Movie Entity : Attributes of Movie are movie_id, movie_name, movie_language, movie_type, movie_hour, movie_description.Movie Type Entity : Attributes of Movie Type are movie_type_id, movie_type_movie_id, movie_type_name, movie_type_description.Movie Library Entity : Attributes of Movie Library are movie_library_id, movie_library_name, movie_library_type, movie_library_description.Movie Library Management System entities and their attributes : The main entities of the Movie Library Management System are Movie Library, Movie Type, Movie, Shows, User and Login. It used structure data and to define the relationships between structured data groups of Movie Library Management System functionalities. The entity-relationship diagram of Movie Library Management System shows all the visual instrument of database tables and the relations between Movie Type, Shows, Movie Library, Login etc. This ER (Entity Relationship) Diagram represents the model of Movie Library Management System Entity.
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