Difficulty understanding a SQL Join query - sql

Question

I have these tables in my database:
Student:
id,
style_id,
instrument,
name,
Teacher:
id,
style_id,
name
lessons:
id,
style_id,
teacher_id,
student_id,
month
And I'm trying to write a query that returns every student enrolled for a particular month and their teacher and style e.g. it would return something like this:
March
Student Name Teacher Style
-------------------------------
Glen Bob Jazz
Missy Bruce Rock
So far all I got is something like this (I know I need to use joins just don't know how):
SELECT
students.name, teacher.name, style.style_name
FROM
lessons
WHERE
month = "March"
JOINS students, teachers

Answer 1

First off, it is not a good practice for you to have the name of the table in your primary key, in your table teacher, you used musician_id, use teacher_id instead. This is the code I would use to achieve what you are trying to do.
SELECT a.style_name, b.name, c.name, d.month
FROM lessons d
INNER JOIN Styles a ON a.style_id = d.style_id
INNER JOIN Student b ON b.student_id = d.student_id
INNER JOIN Teacher c ON c.teacher_id = d.teacher_id
WHERE d.month = "march";
Since you are in difficulty with joins, Inner join, will see if its evidence of the ids in both tables to return true, thats why it solvs your problem.

Answer 2

To answer your specific question,
SELECT Student.name AS Student, Teacher.name AS Teacher, Styles.style_name AS Style
FROM lessons
INNER JOIN Styles ON lessons.style_id = Styles.style_id
INNER JOIN Teacher ON lessons.teacher_id = Teacher.musician_id
INNER JOIN Student ON lessons.student_id = Student.student_id
WHERE lessons.month="March";
You might want to look at your table design, though. You have a style_id in the lessons, the Teachers and the Students tables. The query above matches the style name with the style_id in the lessons table, while it could be linked to either the Teacher table or the Student table. This could lead to reporting problems if Bob is teaching a Jazz lesson and his profile says he's a Rock teacher.
It's better to remove the style_id from the Teacher and Student tables and introduce a new table
Interests: participant_id (could be teacher id or student id), role ('teacher' or 'student'), style_id