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What is a Database


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What is a database? How is the data stored?

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What is a Database

  1. 1. Database
  2. 2. What is a database? • A database is a collection of information organised in a tabular format in the form of rows and columns. You can create database using Database Management System (DBMS).
  3. 3. RDBMS • RDBMS refers to DBMS that stores data in the form of tables that are connected with each other in the database.
  4. 4. What is data type? Data type refers to the type of data which can be stored in a column of a table.
  5. 5. Different Data Types • Text: Stores short alphanumeric values, such as numbers, text or a combination of both. • Memo: Stores substantial alphanumeric text, such as notes and descriptions. • Number: Stores numeric data for arithmetic calculations. A number can be either positive or negative. • Date/Time: Stores date and time values, such as Date of Birth and Date of Joining. • Currency: Stores currency values like the price of a product. • Yes/No: Stores Boolean values, such as Yes/No, True/False and On/Off.
  6. 6. Row and Column • A row or records represents a set of related information about a particular entry in a table. • A column or field represents a category of information or data value, related to all records. Column 1 Column 2 Column3 Column n Record 1 Record 2 Record n
  7. 7. Uniquely Indentify Record • A Primary Key is a column in a table which has unique values. It cannot contain NULL or blank values. A table can have only one column set as Primary Key, which is used to identify a record. UID Column 2 Column3 Column n 001 002 003
  8. 8. Data • Data of different type related to an entity is stored logically. • Entity could be a user, product, service, etc. • Data includes different characteristics related to entity.
  9. 9. Why is it important? • To get the required information at the time of need • To analyse various aspects of entity. For example: – Learning pattern – PII- Personally Identifiable Information – Progress report – Learning outcome • To inspect and improve weak points • To better cater to user needs
  10. 10. How to define? • Database Schema – Logically – Physically – Conceptually • Database has tables • Tables have rows and columns • Rows and columns have data inside them
  11. 11. For more tutorials and courses please visit: