我想计算用户开始时间和上次session结束时间之间的差异..表包含:用户数字、开始/停止unix时间戳。它在用户和开始之后排序userstartstop1150000150010116001116005011601001602002150011150023215500115505521600011605003159001159550我希望结果看起来像这样:userstartstopdiff1150000150010160011-150010=100011160011160050160100-16005011601001602000(newuseronnextrow)215001115