mysql - 使用MYSQL计算同一列中多个日期之间的时间

Question

我有一个数据集，其中包含客户的编号和订单日期，我需要做的是计算每个客户的每个订单之间的天数，例如:

所以我需要知道每个客户的每个订单之间的天数。感谢您的帮助:)

Answer 1

这是您将如何做到这一点，您可以使用dense_rank()

MySQL 8.0

select t1.id, t1.order_date
            , ifnull(
                datediff(cast(t1.order_date as datetime), cast(t2.order_date as datetime))
                ,0) as intrval
    from (
            select dense_rank() over (partition by id order by cast(order_date as datetime) asc) as rnk
                , order_date, id 
            from table1) as t1
    left join 
     (
            select dense_rank() over (partition by id order by cast(order_date as datetime) asc) as rnk
                , order_date, id 
            from table1) as t2
    on t1.id = t2.id and t2.rnk+1 = t1.rnk

输出: