-3
What is wrong?
SELECT
    ID_Contrato_Reserva,
    DATE_FORMAT(STR_TO_DATE(data_ini,"%d/%m/%Y" ), "%Y/%m/%d") AS dataIni,
    DATE_FORMAT(STR_TO_DATE(data_Fim,"%d/%m/%Y" ), "%Y/%m/%d") AS dataFim
FROM 
    contrato_reserva
WHERE
    ( dataIni BETWEEN "2011/09/14" AND "2012/09/14" )
    AND
    ( dataFim BETWEEN "2011/09/17" AND "2012/09/17" )