如何在SQL中將月份的前10天，下10天和一個月的剩余天分割

Question

該查詢將在SQL中按月和年分組。 我想對此用戶進行選擇查詢，用戶將在其中輸入FromDate和ToDate ：

我正在測試的查詢：

select 
    year(CDate) as Payment_year, 
    count(distinct CDate) as count_days,
    month(CDate) as month_name,
    isnull(sum(Amount),0.00) as Total_Amount 
from 
    tblCowMilk
where 
    CDate between '2016-01-01' and '2016-03-31' 
group by 
    year(CDate),
    month(CDate),
    (datepart(day,CDate))/11 
order by 
    month_name 

在此處輸入圖片說明

我想要這樣的結果

                    Payment Register for the Period: 01-05-2015 to 23-02-2016         
 -----------------------------------------------------------------------------------------
 MONTH      days      I PERIOD    days   II PERIOD   day   III PERIOD      TOTAL  
 -----------------------------------------------------------------------------------------
May           10         10.00     10      160.00       11       0.00         170.00

June                     30.00               0.00                0.00          30.00

July                     20.00               0.00               10.00          30.00

August                    0.00               0.00                0.00           0.00

September                10.00               0.00                0.00          10.00

October                   0.00               0.00                0.00           0.00

November                  0.00               0.00                0.00           0.00

December                  0.00               0.00                0.00           0.00

January                   0.00               0.00                0.00           0.00

February                  0.00               0.00                0.00           0.00
-----------------------------------------------------------------------------------------
                         70.00             160.00               10.00         240.00
-----------------------------------------------------------------------------------------

Answer 1

您計算10天小組的邏輯是錯誤的，目前

1-10
11-21
22-end of month

這應該返回正確的結果：

select 
    year(CDate) as Payment_year, 
    count(* as count_days,
    month(CDate) as month_name,
    sum(case when period = 1 then Total_Amount else 0 end) as Period_I,
    sum(case when period = 2 then Total_Amount else 0 end) as Period_II,
    sum(case when period = 3 then Total_Amount else 0 end) as Period_III,
    isnull(sum(Total_Amount),0.00) as Total_Amount
from
 (
   select 
      CDate,
      case -- 10 days within a period
         when datepart(day,CDate) <= 10 then 1
         when datepart(day,CDate) <= 20 then 3
         else 3
      end as period,
     sum(Amount) as Total_Amount
   from 
      tblCowMilk
   where 
      CDate between '2016-01-01' and '2016-03-31' 
   group by 
      CDate,
      case
         when datepart(day,CDate) <= 10 then 1
         when datepart(day,CDate) <= 20 then 3
         else 3
      end
 ) as dt
group by year(CDate), month(CDate)
order by year(CDate), month(CDate)

要獲得總計，您需要標准SQL的擴展分組，我不知道SQL Server 2012是否完全支持此功能：

group by
   grouping sets ((year(CDate),month(CDate)),())
order by
   grouping(year(CDate)), year(CDate),
   grouping(month(CDate)), month(CDate)

或者在您的應用程序中完成總計。

Answer 2

嘗試這個

select 
    year(a.CDate) as Payment_year, 
    month(a.CDate) as month_name,
    COUNT(b.Amount) as 'I Period',
    COUNT(c.Amount) as 'II Period',
    COUNT(d.Amount) as 'II Period',
    isnull(sum(a.Amount),0.00) as Total_Amount 
from 
    tblCowMilk a 
left join tblCowMilk d on d.CDate = a.CDate and DAY(d.CDate) < 11
left join tblCowMilk b on b.CDate = a.CDate and DAY(b.CDate) >10  and DAY(b.CDate) <21
left join tblCowMilk c on c.CDate = a.CDate  and DAY(c.CDate) >20
where 
    a.CDate between '2016-01-01' and '2016-03-31' 

group by 
    year(a.CDate),
    month(a.CDate),
order by 
    month_name