MySQL 8.0 - implementing Ordering Results After a GROUP BY with Multiple Aggregates
I've looked through the documentation and I'm still confused about This might be a silly question, but I'm working with a strange scenario when trying to order the results of a `GROUP BY` query in MySQL 8.0. My query looks something like this: ```sql SELECT department_id, COUNT(*) AS employee_count, AVG(salary) AS average_salary FROM employees GROUP BY department_id ORDER BY employee_count DESC; ``` The intent is to get the number of employees per department and their average salary, ordered by the number of employees in descending order. However, I'm getting results that don't seem to follow the expected order. For example, I see departments with a lower `employee_count` appearing before departments with a higher count. After checking my query, I also noticed that the average salary shows some unexpected decimal places, which wasn't the previous behavior I experienced in MySQL 5.7. I have tried using `CAST` to control the decimal places like this: ```sql SELECT department_id, COUNT(*) AS employee_count, CAST(AVG(salary) AS DECIMAL(10, 2)) AS average_salary FROM employees GROUP BY department_id ORDER BY employee_count DESC; ``` However, the ordering scenario continues. I also tried including the `employee_count` in the `ORDER BY` clause directly, but it still didn't resolve the incorrect ordering. The `EXPLAIN` plan seems fine, and I have appropriate indexes on `department_id` and `salary`. Has anyone else faced this scenario, or could there be something I'm missing in the query logic or in MySQL's behavior? Any insights would be greatly appreciated! This is part of a larger web app I'm building. Has anyone else encountered this? Am I missing something obvious? Thanks in advance!