detail表 记帐流水表
==========
字段：
qt_srMoney   (money) 收入
qt_zcMoney  (money) 支出
qt_date         (datetime) 操作日期
qt_dkfs         (nvarchar)  打款方式
------------------
需获取一个带结余的数据信息
==========
根据期初表中的日期和金额，查询出记帐表中的结余。
帐面结余 ＝期初金额+收入－支出
实验环境:sql server 2008 R2
*/ 
create table detail(qt_srMoney   money,
qt_zcMoney  money,
qt_date         datetime,
qt_dkfs         nvarchar(100))
insert into detail values(100,0,'2018-1-2 10:00:00','other')
insert into detail values(0,10,'2018-2-2 10:00:00','other')
insert into detail values(0,20,'2018-3-2 10:00:00','other')
insert into detail values(30,0,'2018-4-2 10:00:00','other')
insert into detail values(10,60,'2018-5-2 10:00:00','other')
go

declare @datestart datetime ---开始计算日期
set @datestart ='2018-2-1'
declare @qcomney money --期初
set @qcomney =100 
 
select t1.qt_date,t1.qt_dkfs,t1.qt_srMoney,t1.qt_zcMoney,sum(t2.qt_srMoney-t2.qt_zcMoney)+@qcomney
from detail t1,detail t2 
where t1.qt_date>=t2.qt_date 
and t1.qt_date >=@datestart
group by t1.qt_date,t1.qt_dkfs,t1.qt_srMoney,t1.qt_zcMoney
order by t1.qt_date;
go

---避免日期出现两条导致结余数据计算异常-----
declare @datestart datetime ---开始计算日期
set @datestart ='2018-2-1'
declare @qcomney money --期初
set @qcomney =100

with cteName  as 
(
  select qt_srMoney,qt_zcMoney,qt_date,qt_dkfs,  
  row_number() over ( order by qt_date)  as keyID  from detail where qt_date >=@datestart
)  select t1.keyId,t1.qt_date,t1.qt_dkfs,t1.qt_srMoney,t1.qt_zcMoney,sum(t2.qt_srMoney-t2.qt_zcMoney)+@qcomney
from cteName t1,cteName t2 
where t1.keyId>=t2.keyId  
group by t1.qt_date,t1.qt_dkfs,t1.qt_srMoney,t1.qt_zcMoney,t1.keyId
order by t1.keyId;
 
go
truncate table detail
drop table detail