我有一个表,其中包含id,length,time等行,其中一些是重复项,其中某些行的长度和时间是相同的。我想删除提交的第一行的所有副本。
id | length | time 01 | 255232 | 1242 02 | 255232 | 1242 <- Delete that one
我有这个要显示表中的所有重复项。
SELECT idgarmin_track, length , time FROM `80dage_garmin_track` WHERE length in ( SELECT length FROM `80dage_garmin_track` GROUP BY length HAVING count(*) > 1 ) ORDER BY idgarmin_track, length, time LIMIT 0,500
DELETE FROM `80dage_garmin_track` t1 WHERE EXISTS (SELECT 1 from `80dage_garmin_track` t2 WHERE t1.Length = t2.Length AND t1.Time = t2.Time AND t1.idgarmin_track > t2.idgarmin_track)