SQL, Joins, Self-Joins
Imagine a company with the following organization chart:
(that is, Jane manages Jessica and Janet; Jessica manages Al, Bob, and Jen, etc.)
Create a database that could hold this information, so that you can keep track of the employee names and their managers. Each employee should have a primary key that is a unique, autoincrementing integer. Each employee can have (at most) one manager.
Your Tasks
Design the database
Write the CREATE TABLE statement(s) for your design
Write the INSERT statements to insert this data in
Write a query that shows each employee and their managers name (if applicable). Make sure it shows everyone, even people without managers.
Write a query that lists the names of people who do not manage anyone.
Hints
You should be able to do this with one table.
You may want to learn about “self-joins”.