iOS-Java-SQL@Architect

   ///////////////////////////////////////////////////////////////////////////////////////////////// 1. What is an SQL JOIN command, and when do you need it? The SQL  JOIN  command is used to combine data from  two tables in SQL . The  JOIN  clause is often used when tables have at least one column of data in common. Typically, the  JOIN  condition is an equality between columns from the different tables, but other  JOIN  conditions are also possible. You can join more than two tables by using consecutive  JOIN  clauses. There are different types of JOINs:  INNER JOIN ,  LEFT JOIN ,  RIGHT JOIN ,  FULL JOIN , and others. The function of the  JOIN  command is illustrated by this image: 2. How would you write a query to JOIN these two tables? During the interview process, you may be tasked with applying your knowledge to a practical scenario by writing a  JOIN  command. Let’s look at an example so that you can solve this problem with ease. We have two tables: employees - This table conta