摘要:

下文讲述一次报表制作的需求，

需制作一个月的销量的数据汇总，如果其中某一天没有数据，那么就补0处理

例:

/*

统计2018-4月份的销量统计，

无数据的天补0

*/

---建立基础数据

create table saleInfo(dateInfo datetime,qty int )

go

insert into saleInfo (dateinfo,qty)values('2018-4-1',5)

insert into saleInfo (dateinfo,qty)values('2018-4-2',8)

insert into saleInfo (dateinfo,qty)values('2018-4-2',18)

insert into saleInfo (dateinfo,qty)values('2018-4-3',10)

insert into saleInfo (dateinfo,qty)values('2018-4-8',9)

insert into saleInfo (dateinfo,qty)values('2018-4-10',6)

insert into saleInfo (dateinfo,qty)values('2018-4-15',28)

insert into saleInfo (dateinfo,qty)values('2018-4-20',152)

insert into saleInfo (dateinfo,qty)values('2018-4-21',36)

insert into saleInfo (dateinfo,qty)values('2018-4-22',72)

insert into saleInfo (dateinfo,qty)values('2018-4-28',20)

insert into saleInfo (dateinfo,qty)values('2018-4-4',12)

go

--按日期汇总，但是无销售数据的天数无法出现

---select convert(varchar,dateInfo,111) as d,sum(qty) as qty from saleInfo group by convert(varchar,dateInfo,111)

----采用系统常量表spt_values表，辅助补0操作

select convert(varchar,a.d,111) as [日期],

isnull(b.qty,0) as [销量]

from

(

---生成4月份所有的天数

select dateadd(day,number,'2018-4-1') as d from master..spt_values

where type='p'

and number >=0

and dateadd(day,number,'2018-4-1') between '2018-4-1' and dateadd(day,-1,'2018-5-1')

) as a

left join

(

---按天汇总的销量数据

select convert(varchar,dateInfo,111) as d,sum(qty) as qty from saleInfo group by convert(varchar,dateInfo,111)

) as b

on convert(varchar,a.d,111) = b.d

go

truncate table saleInfo

drop table saleInfo