简单粗暴法to_days()
where to_days(w1.RecordDate)-to_days(w2.RecordDate)=1
增加法date_add()
where date_add(w2.RecordDate,interval 1 day)=w1.RecordDate
where date_add(w1.RecordDate,interval -1 day)=w2.RecordDate
时间差法 datediff()，返回天数
where datediff(w1.RecordDate,w2.RecordDate)=1