sql - 使用sql server添加每月的所有金额

Question

这是我的数据

date           amount
2017-07-10     15.00
2017-07-10     15.00
2017-07-28     25.00
2017-08-01     100.00
2017-08-12     15.00
2017-08-29     200.00
2017-09-18     105.00
2017-09-21     200.00
2017-09-23     25.00
2017-10-12     15.00
2017-10-14     500.00
2017-11-01     200.00
2017-11-02     200.00

我想按月添加，所以我们会得到什么，六月我总共得到 55 个，八月我将得到 315 个，九月 330 个，十月 515 个，十一月 400 个，过去没有金额的日期将为 0 如何我会这样做吗？

这是我的临时表代码:

create table #TempTable
    (month varchar(50),
    amount decimal(18,2))


insert into #TempTable (month)
SELECT TOP 12
DATENAME(MONTH, DATEADD(MONTH,ROW_NUMBER() OVER (ORDER BY object_id) - 1,0))
FROM sys.columns

create table #Data
    (date date,
    amount decimal(18,2))
  insert into #Data(date,amount) values('2017-07-10',15.00)
  insert into #Data(date,amount) values('2017-07-10',15.00)
  insert into #Data(date,amount) values('2017-07-28',25.00)
  insert into #Data(date,amount) values('2017-08-01',100.00)
  insert into #Data(date,amount) values('2017-08-12',15.00)
  insert into #Data(date,amount) values('2017-08-29',200.00)
  insert into #Data(date,amount) values('2017-09-18',105.00)
  insert into #Data(date,amount) values('2017-09-21',200.00)
  insert into #Data(date,amount) values('2017-09-23',25.00)
  insert into #Data(date,amount) values('2017-10-12',15.00)
  insert into #Data(date,amount) values('2017-10-14',500.00)
  insert into #Data(date,amount) values('2017-11-01',200.00)
  insert into #Data(date,amount) values('2017-11-02',200.00)

  select * from #Data
  select * from #TempTable
drop table #TempTable
drop table #Data

PS。只需更新#TempTable 并将总计放在上面即可，谢谢:)

Answer 1

使用下面的代码:

SELECT Res1.[Month]
         ,ISNULL(Res2.Amount,0)
  FROM #TempTable Res1
  LEFT JOIN
  (
  select DATENAME(MONTH,Res1.date) AS [Month]
         ,SUM(amount) AS Amount 
  from #Data Res1
  GROUP BY DATENAME(MONTH,Res1.date) 
  )Res2 ON Res2.[Month] = Res1.[Month]