SELECT FROM intervention i1 WHERE to_char(i1.interventiondate,'YYYY')='2016'
AND EXISTS(SELECT 1 FROM intervention i2 WHERE i1.mechanic=i2.mechanic AND i1.type=i2.type AND i1.interventiondate - interval '1 month' < i2.interventiondate::timestamp AND i2.interventiondate < i1.interventiondate GROUP BY i2.mechanic HAVING COUNT(i2.interventionid)>5)