Using the distinct function in SQL

Question

I have a SQL query I am running. What I was wanting to know is that is there a way of selecting the rows in a table where the value in on one of those columns is distinct? When

Answer 1

The following might help you get to your solution. The other poster did point to this but his syntax for group by was incorrect.

Get all teachers that teach any classes.

   Select teacher_id, count(*)
    from teacher_table inner join classes_table
    on teacher_table.teacher_id = classes_table.teacher_id
    group by teacher_id