SQL 按年，月，日统计相关函数

说明：

统计每月下组织每天费用记录

表：MemberMoney  

字段   Id   主键

          用户Id varchar(50)

          OnOrgId 所在单位 varchar(50)

          RealPay 金额 decimal(18,2)

          PayDate 缴费时间 datetime

          AddYear 年 int

          PayMonth 月 int

          PayType 缴费方式 int(0，在线支付 ;1,现金)

 select p.* ,o.ShortName as OnOrgName from (  
　　 select a.*,ISNULL(b.OnlineFee,0) OnlineFee,ISNULL(c.CashFee,0) CashFee from (  
 　　select OnOrgID,cast( cast(year(PayDate) as varchar) +'-'+cast(month(PayDate) as varchar) +'-'+cast(day(PayDate) as varchar) as date) as Pdate,sum(RealPay) as Pmoney from MemberMoney 
  　　where AddYear=2020 and PayMonth=9 and PayDate is not null and OnOrgID=''  group by OnOrgID,year(PayDate),month(PayDate),day(PayDate) )a  
  　　left join  
   　　( select OnOrgID,cast( cast(year(PayDate) as varchar) +'-'+cast(month(PayDate) as varchar) +'-'+cast(day(PayDate) as varchar) as date) as Pdate,
  　　 sum(RealPay) as OnlineFee 
  　　 from MemberMoney  where AddYear=2020 and PayMonth=9 and PayDate is not null and OnOrgID='' and PayType=0  group by OnOrgID,year(PayDate),month(PayDate),day(PayDate) 
  　　 )b  
  　　 on a.OnOrgID=b.OnOrgID   and a.Pdate=b.Pdate
  　　 left join  
   　　 ( select OnOrgID,cast( cast(year(PayDate) as varchar) +'-'+cast(month(PayDate) as varchar) +'-'+cast(day(PayDate) as varchar) as date) as Pdate,sum(RealPay) as CashFee from MemberMoney  
   　　 where AddYear=2020 and PayMonth=9 and PayDate is not null  and OnOrgID='' and PayType=1  group by OnOrgID,year(PayDate),month(PayDate),day(PayDate)
   　　  )c  

 　　 on a.OnOrgID=c.OnOrgID   and a.Pdate=c.Pdate
     
 ) p left join Base_Organize o on p.OnOrgID=o.OrganizeId order by pdate
 

ISNULL 判断是否为NULL ，为NULL赋值0

cast(字段 as varchar) 例 int 转 string

year(PayDate) 得到年

month(PayDate)得到月

day(PayDate)得到天