table student id PK name faculty_id table faculty id PK name SELECT f.name, count(*) FROM faculty f JOIN student s ON s.faculty_id = f.id GROUP BY f.id, f.name GROUP BY /*f.id,*/ f.name GROUP BY f.id/*, f.name*/

In an SQL query using JOIN and GROUP BY, it is important to group data correctly.

In this case:

SELECT f.name, count(*)
FROM faculty f
JOIN student s ON s.faculty_id = f.id
GROUP BY f.id, f.name

Grouping by f.id, f.name is correct because f.id is a primary key, and f.name is an attribute associated with it.

Trying to group only by f.name may lead to errors or incorrect results if faculty names are not unique.

Grouping only by f.id is also correct since id is unique, and you can select f.name without grouping if the database system allows it.

In conclusion, for accurate counting of students per faculty, it is better to group by f.id (the unique identifier).