Lorsque vous utilisez plusieurs jointures dans la requête principale, vous vous retrouvez avec un produit croisé de toutes les tables, de sorte que les sommes sont multipliées par le nombre de lignes correspondantes dans une autre table. Vous devez déplacer les sommes dans des sous-requêtes.
SELECT last_name, first_name, DATE_FORMAT(LEAST(mil_date, tm_date), '%m/%d/%y' ) AS dates,
total, minutes
FROM bhds_teachers AS i
LEFT JOIN (
SELECT ds_id, YEARWEEK(mil_date) AS week, MIN(mil_date) AS mil_date, SUM(drive_time) AS minutes
FROM bhds_mileage
WHERE mil_date BETWEEN '2016-04-11' AND '2016-04-30'
AND bhds_mileage.ds_id = 5
GROUP BY ds_id, week) AS m
ON m.ds_id = i.ds_id
LEFT JOIN (
SELECT ds_id, YEARWEEK(tm_date) AS week, MIN(tm_date) AS tm_date, SUM(tm_hours) AS total
WHERE tm_date BETWEEN '2016-04-11' AND '2016-04-30' AND bhds_timecard.ds_id = 5
GROUP BY ds_id, week) AS t
ON t.ds_id = i.ds_id AND t.week = m.week
