Databases Design - Database Management System
Subject and UNIT: Database Management System: Unit II: Databases Design
There are two primary goals of relational database design - i) To generate a set of relation schemas that allows us to store information without unnecessary redundancy, and ii) To allows us to retrieve information easily.
Databases Design - Database Management System
Subject and UNIT: Database Management System: Unit II: Databases Design
In this section we will discuss how to map various ER model constructs to Relational Model construct.
Databases Design - Database Management System
Subject and UNIT: Database Management System: Unit II: Databases Design
An E-R diagram can express the overall logical structure of a database graphically.
Databases Design - Database Management System
Subject and UNIT: Database Management System: Unit II: Databases Design
Some entities have relationships that form hierarchies. For instance, Employee can be an hourly employee or contracted employee.
Databases Design - Database Management System
Subject and UNIT: Database Management System: Unit II: Databases Design
An E-R diagram can express the overall logical structure of a database graphically.E-R diagrams are used to model real-world objects like a person, a car, a company and the relation between these real-world objects.
Databases Design - Database Management System
Subject and UNIT: Database Management System: Unit II: Databases Design
Mapping Cardinality represents the number of entities to which another entity can be associated via a relationship set. The mapping cardinalities are used in representing the binary relationship sets.
Databases Design - Database Management System
Subject and UNIT: Database Management System: Unit II: Databases Design
Entity Relational model is a model for identifying entities to be represented in the database and representation of how those entities are related.
Relational Databases - Database Management System
Subject and UNIT: Database Management System: Unit I: Relational Databases
A Database Management System (DBMS) is collection of interrelated data and various programs that are used to handle the data.
Relational Databases - Database Management System
Subject and UNIT: Database Management System: Unit I: Relational Databases
The programing module in which the SQL Statements are embedded is called Embedded SQL module.
Relational Databases - Database Management System
Subject and UNIT: Database Management System: Unit I: Relational Databases
Structure Query Language(SQL) is a database query language used for storing and managing data in Relational DBMS.
Relational Databases - Database Management System
Subject and UNIT: Database Management System: Unit I: Relational Databases
Structure Query Language(SQL) is a database query language used for storing and managing data in Relational DBMS.
Relational Databases - Database Management System
Subject and UNIT: Database Management System: Unit I: Relational Databases
There are two formal query languages associated with relational model and those are relational algebra and relational calculus.