MySQL COUNT with HAVING Clause: Usage Guide

In MySQL, the HAVING COUNT statement is commonly used in conjunction with GROUP BY to filter results of aggregate functions. The HAVING COUNT statement is used when filtering data after it has been grouped.

For example, imagine there is a table named “students” that includes the students’ names and their exam scores. To query the names and scores of students who scored above 90, and only display those who have taken the exam more than once, you can use the following statement:

SELECT name, AVG(score) as average_score, COUNT(*) as exam_count
FROM students
GROUP BY name
HAVING average_score > 90 AND exam_count > 1;

In the above example, the HAVING clause filters student data with an average score greater than 90 and exam counts greater than 1. The purpose of the HAVING COUNT statement is to filter the results of the GROUP BY clause in order to obtain data that meets the specified conditions.