Bergabunglah dengan tabel dengan masalah SUM di MYSQL

Saat Anda menggunakan beberapa gabungan dalam kueri utama, Anda berakhir dengan produk silang dari semua tabel, sehingga jumlahnya dikalikan dengan jumlah baris yang cocok di tabel lain. Anda perlu memindahkan jumlahnya ke dalam subkueri.

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