16.20 - Example: NOT EXISTS with Correlated Subqueries - Advanced SQL Engine - Teradata Database

Select the names of all students who have registered in at least one class offered by each department that offers a course.

   SELECT SName, SNo 
   FROM student s
   WHERE NOT EXISTS
    (SELECT * 
     FROM department d 
     WHERE d.Dept IN 
      (SELECT Dept 
       FROM course) AND NOT EXISTS
        (SELECT * 
         FROM course c, registration r, class cl 
         WHERE c.Dept=d.Dept 
         AND c.CNo=r.CNo 
         AND s.SNo=r.SNo
         AND r.CNo=cl.CNo 
         AND r.Sec=cl.Sec)));

With the contents of the tables as in “Example: EXISTS with Correlated Subqueries”, the following rows are returned:

   SName          SNo
   -----          ---
   Helen Chu      1