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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  1. Database
  2. View of Data

Schema & Instance

Schema

  • A schema is a description of the data interface to the database (i.e. how the data is organized).

  • Schema is the overall design of a database.

  • It is the skeleton structure of the database.

  • It represents the logical view of the entire database.

  • A schema contains schema objects:- table, columns, data types, foreign key, primary key, views, stored procedure, etc.

  • It represents database objects and relationships with visual diagrams.

  • It is designed by database designers to help programmers.

  • The process of database creation is called data modeling.

  • A schema diagram can display only some aspects of a schema like the name of record type, data type, and constraints. Other aspects can't be specified through the schema diagram.

Instance

  • A database instance is a database (real data) that conforms to a given schema.

  • Data at a particular moment of time is called the instance of the database.

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