SQL Join Join clause is used to mege data from two or more table into one table, using shared column between the two t…

Aggregate Functions Count( ) Sum( ) Max( ) Min( )  Min( ) Avg( ) we will use the following employees table for our exa…

Data Manipulation Language (DML) DML commands are used to inert new values into a table, updating, deleting and retri…

SQL Constraints Constraints are used to control and validated the data in a table. Types of constraints Primary Ke…

What is SQL? SQL stands for Structured Query Language, it allows you to access update, retrieve, and manage the rela…