JOIN query merge two or more tables into a single one. It gathers data from various tables. This is a collection of following statements such as SELECT, UPDATE and DELETE. The old syntax of JOINS used to work on implicit joins without any keywords. Now it has the keyword to work best for readability, maintenance, and best practices. JOINs has a various form of the different type of aggregation depends upon their specifications such as such as a left join, right join, or inner join.
BY Best Interview Question ON 13 Jan 2019