Database Management System and SQL
Database Management System and SQL
  • Database Management System and SQL
  • Database
    • Introduction to Database
      • Definition
      • File System
      • Different types of Database
      • Uses of DBMS
      • Basic Terms in Database
      • Query Language
    • View of Data
      • Data Abstraction
      • Schema & Instance
      • Data Models
    • Database Architecture
      • DBMS Tier Architecture
      • Three Schema Architecture
      • Data Independence
    • Relational Database Management System (RDBMS)
      • Entity-Relationship (ER) Model
      • Attributes
      • Keys
      • Relationship
    • Functional Dependencies
    • Normalization
  • MySQL
    • Terminology
    • Database Statements
    • Table
      • Data Type
      • Create
      • Show
      • Describe
      • Drop
      • Alter
      • Auto Increment
      • Index
    • Insert
    • Select
      • Condition
      • Aggregate Functions
      • Join
    • View
    • Delete
    • Update
    • MySQL Constraints
      • NOT NULL
      • DEFAULT
      • CHECK
      • UNIQUE
      • PRIMARY KEY
      • FOREIGN KEY
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  • Entity
  • Entity Set
  • Weak Entity

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  1. Database
  2. Relational Database Management System (RDBMS)

Entity-Relationship (ER) Model

Entity-Relationship (ER) Model

  • Entity-relationship model is a model used for design and representation of relationships between data.

  • Entity and Entity Set

  • Attributes

  • Keys

  • Relationships

Entity

  • A real-world object which has characteristics and holds relationships in a DBMS.

Entity Set

  • The complete datasets of an Entity is the Entity Set.

Weak Entity

  • An entity that depends on another entity called a weak entity.

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Last updated 1 year ago

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