Question

We want to find out the names of all the employees and their managers. Select EMPLOYEE, MANAGER FROM employee e, employee m WHERE e.manager_ssn= ?

Answer 1

The question involves writing an SQL query to find employees and their managers. A self-join is used on the employee table, matching employee's manager SSN to the manager's SSN. The correct query includes aliases for clarity and proper joining conditions.

Step-by-step explanation:

The question you've asked is concerning how to retrieve information about employees and their managers from a database table using SQL. Assuming that the employee table has a reference to the manager through a manager social security number (SSN), we can perform a self-join on the employee table to obtain the required information. The correct SQL query would involve joining the employee table to itself, with one alias representing employees and the other representing managers.

Here is the correct SQL query:

SELECT e.name AS Employee, m.name AS Manager
FROM employee e
JOIN employee m ON e.manager_ssn = m.ssn;

In this query, e is an alias for the employees and m is an alias for the managers. We join the two instances of the employee table on the condition that the employee's manager SSN matches the SSN of the manager. This will return a list with the names of all employees along with the names of their managers.