What is the meaning of "EMPTY SET" in the following MySQL command?

SELECT fname, lname, person_id
FROM person
WHERE lname=’s’;
/* after Execution*/ Mysql tool RETURN EMPTY SET 0:00sec

Solution (By Examveda Team)

This question is about understanding what "EMPTY SET" means in a MySQL query result. Let's break it down:
You're running a query to get the first name (fname), last name (lname), and person ID (person_id) from a table called 'person'.
The query specifically looks for entries where the last name (lname) is equal to 's'.
The message "EMPTY SET" tells us that no rows in the table matched the condition. In other words, there's no person with a last name 's' in the 'person' table.
Here's why the options are correct or incorrect:
Option A: No values - CORRECT
This is the most accurate description. The query didn't find any rows that fit the criteria.
Option B: Error - INCORRECT
"EMPTY SET" doesn't indicate an error. It's a normal outcome when a query doesn't find any matching data.
Option C: Access denied - INCORRECT
Access denied means you don't have permission to access the table. "EMPTY SET" means you have permission but no data was found.
Option D: None of the mentioned - INCORRECT
"No values" accurately describes the meaning of "EMPTY SET".
In summary: "EMPTY SET" means the query didn't return any rows because no records in the table matched the specified condition.