How can I display data belonging to a specific person(once he logs in a form, using SQL), for instance, his or her grades?

Question

Probably, I could provide a table, but what is the query?

Answer 1

//This is just an example. I don't know how you database and your table are structure but I hope it helps

select avr_score
from students stu
where stu.name = @name -> this is just a parameter you might give when you run the query

//I know this may not be the best example but if you maybe share your table I can help better