Question

How would you perform a cross self join with the columns: empid, firstname, and lastname from the Employees table?

Answer 1

To perform a cross self join on the Employees table, you can use the SQL query SELECT e1.empid, e1.firstname, e1.lastname, e2.empid, e2.firstname, e2.lastname FROM Employees e1 CROSS JOIN Employees e2. This will create a Cartesian product of the table with itself, combining every row with every other row.

Step-by-step explanation:

To perform a cross self join with the columns empid, firstname, and lastname from the Employees table, you can use the following SQL query:

SELECT e1.empid, e1.firstname, e1.lastname, e2.empid, e2.firstname, e2.lastname FROM Employees e1 CROSS JOIN Employees e2;

This query will create a Cartesian product of the Employees table with itself, combining every row with every other row. The result will have all possible combinations of empid, firstname, and lastname from the table.