Question

I have following issue. There are two tables – groups and students and third pivot table group_student.

Query to get students from specific groups (id:1,8) is clear…

   SELECT DISTINCT s.*
   FROM students AS s
   Inner Join group_student AS gs ON gs.student_id = s.id
   Inner Join groups AS g ON g.id = gs.group_id
   WHERE g.id IN ("1","8")

It works. But, how to query, if I want to select just segment of students of group id 1. For example s.name = "john". So the result should be: all students from group id 8 + all students with name "john" from group id 1.

Thanx for posts 🙂

Answer 1

Try this:

SELECT DISTINCT s.*
   FROM students AS s
   Inner Join group_student AS gs ON gs.student_id = s.id
   Inner Join groups AS g ON g.id = gs.group_id
   WHERE g.id ="8" or (g.id="1" and s.name = "john")