摘要:

下文講述一次報表制作的需求，

需制作一個月的銷量的數(shù)據(jù)匯總，如果其中某一天沒有數(shù)據(jù)，那么就補0處理

例:

/*

統(tǒng)計2018-4月份的銷量統(tǒng)計，

無數(shù)據(jù)的天補0

*/

---建立基礎(chǔ)數(shù)據(jù)

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

--按日期匯總，但是無銷售數(shù)據(jù)的天數(shù)無法出現(xiàn)

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

----采用系統(tǒng)常量表spt_values表，輔助補0操作

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

isnull(b.qty,0) as [銷量]

from

(

---生成4月份所有的天數(shù)

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

(

---按天匯總的銷量數(shù)據(jù)

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

總結(jié)

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