按时间分段算费用

第一个表 table1 为消费都用的时间：

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[Table1]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[Table1]
GO

CREATE TABLE [dbo].[Table1] (
 [AutoID] [int] NOT NULL ,
 [BeginTime] [datetime] NULL ,
 [EndTime] [datetime] NULL
) ON [PRIMARY]
GO

 insert into table1

   select 1 ,'2013-10-01 13:04:05.000','2013-10-01 14:04:05.000'

第二张表为记费规则表：

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[Table2]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[Table2]
GO

CREATE TABLE [dbo].[Table2] (
 [AutoID] [int] NOT NULL ,
 [BeginTime] [datetime] NULL ,
 [EndTime] [datetime] NULL ,
 [Fee] [decimal](18, 0) NULL
) ON [PRIMARY]
GO

insert into table2

select 1,'2013-10-01 12:00:00.000','2013-10-01 13:00:00.000',2 union

select 2,'2013-10-01 13:00:00.000','2013-10-01 14:00:00.000',3 union

select 3,'2013-10-01 14:00:00.000','2013-10-01 15:00:00.000',4

计算的sql 语句如下：
select *,cast(DATEDIFF( Minute, begintime,endTime) as decimal(18,4))/60 * fee as cost from(
select

case when b.begintime < a.begintime and  a.begintime < b.endTime then  a.beginTIme else b.beginTime  end  as beginTime,
case when b.begintime < a.endTime and  a.endTime < b.endTime then  a.endTIme else  b.endTIme  end  as EndTime,
b.fee

 from table1 a  CROSS  join table2 b

where
((a.begintime >b.begintime)   and  (a.begintime < b.endTime)) or

(b.begintime < a.endTime and  a.endTime < b.endTime)) as a

结果如下：