| A database is an organized collection of information. A simple example of a database are like your telephone directory, recipe book etc. |
| A Relational model is the basis for any relational database management system (RDBMS). A relational model has mainly three components: |
| 1) A collection of objects or relations,. |
| 2) Operators that act on the objects or relations. |
| 3) Data integrity methods. |
| To design a database we need three things: |
| 1). Table |
| 2). Rows |
| 3). Columns |
| A table is one of the most important ingredient to design the database. It is also known as a relation, is a two dimensional structure used to hold related information. A database consists of one or more tables. |
| A table contains rows : Rows is a collection of instance of one thing, such as the information of one employee. |
| A table contains the columns: Columns contains all the information of a single type. Each column in a table is a category of information referred to as a field. |
| One item of data, such as single phone number of a person is called as a Data Value. |