No la he probado
    
Código sql:
Ver original- SELECT alumnos.nif, alumnos.nombre, t1.total totalpendientes 
-   FROM alumnos INNER JOIN 
-     (SELECT alumno, COUNT(*) total FROM examenes 
-       WHERE evaluado = FALSE GROUP BY alumno HAVING total >=1 )t1 
-          ON alumnos.nif = t1.alumno ORDER BY alumnos.nombre