select COUNT(tlast._ident) as "Total"
FROM
(
SELECT * FROM
(
SELECT tlast._ident FROM Prelude_Alert AS top
LEFT JOIN Prelude_Alert AS tlast ON (tlast._ident = top._ident and tlast._ident BETWEEN 6481 AND 16239)
GROUP BY 1 ORDER BY tlast._ident DESC LIMIT 9758
) AS taux
except
SELECT * FROM
(
SELECT tlast._ident FROM Prelude_Alert AS top
LEFT JOIN Prelude_Alert AS tlast ON (tlast._ident = top._ident and tlast._ident BETWEEN 6481 AND 16239)
GROUP BY 1 ORDER BY tlast._ident DESC LIMIT 9758
) AS taux
WHERE taux._ident is null
) AS tlast
e-REdING. Biblioteca de la Escuela Superior de Ingenieros de Sevilla.
