Formulate SQL query

Question

Iam new to SQL and I have to create SQL statement to select from following tables:

studentTable (studentID, firstName, lastName)

enrollmentTable (studentID, courseID, semester, year, grade) 

(studentID and courseID are foreign keys)

courseTable (courseID, semester, year, name)

prereqTable (courseID, prereqID)

I have to select students that enrolled course but don't have fulfilled all prereq.

EDIT:

After a while I got the right solution. The key was to use multiple selects and it worked like a charm.

Answer 1

SELECT * FROM studentTable
         WHERE EXISTS(
           SELECT * FROM enrollmentTable, prereqTable 
                    WHERE enrollmentTable.studentID = studentTable.studentID  
                      AND prereqTable.courseID = enrollmentTable.courseID 
                      AND NOT EXISTS (SELECT * FROM enrollmentTable 
                                              WHERE enrollmentTable.courseID = prereqTable.prereqID
                                                AND enrollmentTable.studentID = studentTable.studentId)
         )

Answer 2

After a while I got the right solution. The key was to use multiple selects and it worked like a charm.