25 lines
1.1 KiB
MySQL
25 lines
1.1 KiB
MySQL
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CREATE VIEW total_alumnos(asignatura, cantidad) AS (
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SELECT A.id_asignatura, COUNT(*) FROM asignatura A
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JOIN registro R ON (R.id_asignatura = A.id_asignatura)
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JOIN alumno A2 ON (A2.rut_alumno = R.rut_alumno)
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JOIN asociado A3 ON (A3.id_asignatura = A.id_asignatura)
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WHERE (A3.id_curso = '1A-2018')
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GROUP BY (A.id_asignatura)
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);
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CREATE VIEW total_aprobados(asignatura, cantidad) AS (
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SELECT A.id_asignatura, COUNT(*) FROM asignatura A
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JOIN registro R ON (R.id_asignatura = A.id_asignatura)
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JOIN alumno A2 ON (A2.rut_alumno = R.rut_alumno)
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JOIN asociado A3 ON (A3.id_asignatura = A.id_asignatura)
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WHERE (A3.id_curso = '1A-2018' AND R.nota >= 4)
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GROUP BY (A.id_asignatura)
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);
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SELECT A2.nombre, TRUNC(CAST(T1.cantidad AS DECIMAL(3,2)) * 100 / CAST(T2.cantidad AS DECIMAL(3,2)),2) AS porcentaje
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FROM total_aprobados T1
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JOIN total_alumnos T2 ON (T2.asignatura = T1.asignatura)
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JOIN asociado A ON (T1.asignatura = A.id_asignatura AND T2.asignatura = A.id_asignatura)
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JOIN asignatura A2 ON (A2.id_asignatura = A.id_asignatura)
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WHERE ((CAST(T1.cantidad AS DECIMAL(3,2)) * 100 / CAST(T2.cantidad AS DECIMAL(3,2))) < 50);
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