Question

"6 USE Createguitarshop DATABASE

Write a SELECT statement that returns
these two columns:
CategoryName The CategoryName column from the Categories table
ProductID The ProductID column from the Products table
Return one row for each category that has never been used.
Hint: Use an outer join and only return rows where
the ProductID column contains a null value."

Answer 1

To return the CategoryName column from the Categories table and the ProductID column from the Products table for categories that have never been used, you can use an outer join and check for null values in the ProductID column.

Step-by-step explanation:

To return the CategoryName column from the Categories table and the ProductID column from the Products table for categories that have never been used, you can use an outer join and check for null values in the ProductID column. Here is an example of the SELECT statement:

SELECT c.CategoryName, p.ProductID FROM Categories c LEFT JOIN Products p ON c.CategoryID = p.CategoryID WHERE p.ProductID IS NULL;

This statement performs a left outer join between the Categories and Products tables based on the CategoryID column. It then filters the result to only include rows where the ProductID is null, meaning these categories have never been used.