我有一个包含以下字段的 mysql 表:
_id
, userId
, objectId
,timeStamp
我想计算所有用户与对象交互的总时间。
我创建了计算行与其后续行之间的时间差的查询,但这没有考虑给定用户的操作顺序。该查询如下所示:
SELECT A._id, A.USERID, A.objectid, A.timeStamp,
SUBSTRING(A.timeStamp, 12, 2) as hourOfDay,
TIME_TO_SEC(TIMEDIFF(B.timeStamp, A.timeStamp)) as diff
FROM InteractionsTBL A
INNER JOIN InteractionsTBL B ON B._id = (A._id + 1) and B.USERID = A.USERID
where A.timeStamp > '2012-04-18 1:00:00'
and A.timeStamp < '2012-04-18 23:59:00'
group by hourOfDay, A.objectid
ORDER BY A._id ASC
如何计算按一天中的时间和 objectId 分组的所有用户与对象交互的总时间?