Mysql can you join a table to itself

Summary : in this tutorial, you will learn how to use MySQL self join that joins a table to itself using the inner join or left join. However, there is a special case that you need to join a table to itself, which is known as a self join. The self join is often used to query hierarchical data or to compare a row with other rows within the same table. To perform a self join, you must use table aliases to not repeat the same table name twice in a single query.

It works by using other join types such as inner or left join clause to combine rows based on the conditions specified. Basic Usage MySQL self-join uses table aliases to ensure you do not repeat the same table more than once in one statement. Phillip" , " [email protected] " , , 1 , "Sean R. Storie" , " [email protected] " , , 2 , "Bobby S. Newsome" , " [email protected] " , , 5 ;. John Otieno My name is John and am a fellow geek like you. The employees table stores not only employee data but also organizational data.

The ReportsTo column specifies the reporting relationship between employees. Try It. The employees table has two roles: employees and managers. Note that the concatenation operator concatenates multiple strings into a single string.