SQL计算两个时间段相隔时间

SQL语句：

select cast(floor(datediff(minute,时间1,时间2) / 1440) as varchar)+'天'+

cast(floor((datediff(minute,时间1,时间2) % 1440)/60) as varchar)+'小时'+

cast(((datediff(minute,时间1,时间2))-

(floor(datediff(minute,时间1,时间2) / 1440) *1440)-

(floor((datediff(minute,时间1,时间2) % 1440)/60)*60)) as varchar)+'分'

from 表名

返回：xx天xx小时xx分

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实例：

select oc.ID,oc.CarNumber,oc.PrintTime1,oc.PrintTime2, (

cast(floor(datediff(minute,oc.PrintTime1,oc.PrintTime2) / 1440) as varchar)+'天'+

cast(floor((datediff(minute,oc.PrintTime1,oc.PrintTime2) % 1440)/60) as varchar)+'小时'+

cast(((datediff(minute,oc.PrintTime1,oc.PrintTime2))-

(floor(datediff(minute,oc.PrintTime1,oc.PrintTime2) / 1440) *1440)-

(floor((datediff(minute,oc.PrintTime1,oc.PrintTime2) % 1440)/60)*60)) as varchar)+'分') interval
 from t_ordercar oc
left join t_order o on oc.OrderID = o.ID
where o.SupplierName='金冠电厂2'  and  datediff(d,o.AddTime,'2017-12-19') =0

返回结果：