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- SELECT CONCAT (C.titulo,' tiene ', COUNT(A.apellidos),' alumnos') AS Info_profesores
- FROM alumnos AS A,cursos AS C, alumnos_cursos AS AC
- WHERE C.id_curso = AC.id_curso
- AND A.id_alumno = AC.id_alumno
- GROUP BY C.titulo
- HAVING COUNT(a.apellidos) = 2
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