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Databases SQL Reporting by Example Day 1: Joining Tables 8th Grade Teachers

Frances Angulo
Frances Angulo
5,311 Points
Posted by Frances Angulo
Frances Angulo
5,311 Points

My solution returned more results

select DISTINCT teachers.first_name as Teacher_first, teachers.last_name as Teacher_last, students.grade from students join schedule on students.id = schedule.student_id join classes on schedule.class_id = classes.id join teachers on classes.teacher_id = teachers.id where students.grade = 8

You got ~6 teachers and I got many more- what is my query actually returning?

3 Answers

Steven Parker
Steven Parker
229,732 Points
Steven Parker
Steven Parker
229,732 Points

The original question was "Which teachers teach only students in 8th grade?"

I believe this query answers the question "Which teachers teach any students in 8th grade?"

Frances Angulo
Frances Angulo
5,311 Points
Frances Angulo
Frances Angulo
5,311 Points

ahhhhh that makes sense. Thank you!

Sumiya Malik
Sumiya Malik
3,976 Points
Sumiya Malik
Sumiya Malik
3,976 Points 
-- Which teachers teach only students in 8th grade
  SELECT distinct TEACHERS.First_name, Teachers.Last_name
  FROM Teachers JOIN
  Classes ON Teachers.ID = Classes.Teacher_ID
  JOIN Subjects
  ON Subjects.ID = Classes.Subject_ID
  where subjects.grade=8
  order by First_name, Last_name