I am inquiring about mysql join. I want to make sure that it doesn't print as many numbers as it does.

I'm a beginner, so I don't know the exact keyword of the question.

table_student

table_student_info

select t1.student_id, t1.student_name, t2.email from student as t1
    join student_info as t2 on t1.student_id = t2.student_id

The results of sending and receiving the above query are as follows.

What I want is that the value of student_id = 2 comes out only once, not twice.

We are going to print it by turning the loop with php, so I hope the same student_id value is printed once as shown below.