title: MySQL Anti Join
body: <p>I have two Tables:</p>
  
  <p>Course: Id, Name</p>
  
  <p>Teacher: IdUser, IdCourse, IdSchool</p>
  
  <p>Now, for Example I have a user with the id 10 and a School with the id 4 .</p>
  
  <p>I want to make a Select over all the Cousrses in the table Course, that their Id are NOT recorded in the Table Teacher at the same line with the IdUser 10 and IdSchool 4.</p>
  
  <p>How could I make this query?</p>