SET @annee = '2008';
SELECT
DateDebut,
DateFin
FROM
test_date
WHERE
TO_DAYS( STR_TO_DATE( CONCAT(@annee, '-01-01'), '%Y-%m-%d' ) ) - TO_DAYS( DateDebut )
BETWEEN
- DAYOFYEAR(STR_TO_DATE( CONCAT(@annee, '-12-31'), '%Y-%m-%d' ) )
AND
DATEDIFF( DateFin, DateDebut )