SQL嵌套總和查詢

Question

我有一張表，我需要在發票上創建三個基於月份的總和。

使用「invoice_number」字段的前三個字母計算總和，然後爲該特定發票類型添加所有「Invoice_Amount」。數據

例 INVOICE_NUMBER - MSP-1111 發票金額 - $ 2100.00

我要那麼它格式，例如計算這個基礎關閉幾個月

Year | Month | Total MSP Invoices| Total PS Invoices | Total App Invoice 

我能夠得到的幾個月裏，然而，所有月份的總數都是相同的，而不是特定於那個月。以下是我正在使用的查詢。

我想顯示過去12個月。

select year(date_invoice) as Year, 
    Case month(date_invoice) 
     When 1 Then 'Jan' 
     When 2 Then 'Feb' 
     When 3 Then 'March' 
     When 4 Then 'April' 
     When 5 Then 'May' 
     When 6 Then 'June' 
     When 7 Then 'July' 
     When 8 Then 'Aug' 
     When 9 Then 'Sept' 
     When 10 Then 'Oct' 
     When 11 Then 'Nov' 
     When 12 then 'Dec' 
    End 
as Month, 
(Select sum(invoice_amount) from invoices where Invoice_number like 'MSP%') as 'MSP', 
(Select sum(invoice_amount) from invoices where Invoice_number like 'PS%') as'PS', 
(Select sum(invoice_amount) from invoices where Invoice_number like 'APP%') as 'App' 
from invoices 
Where convert(nvarchar(50), date_invoice,100) > DATEADD(month, -12, getdate()) 
Group by year(date_invoice), month(date_invoice) 
Order by year(date_invoice), month(date_invoice) 

任何幫助都會很棒！

Answer 1

你應該能夠在那裏你把CASE表達拿到一個月的名稱使用的情況下聲明這將組是正確的

select year(date_invoice) as Year, 
Case month(date_invoice) 
    When 1 Then 'Jan' 
    When 2 Then 'Feb' 
    When 3 Then 'March' 
    When 4 Then 'April' 
    When 5 Then 'May' 
    When 6 Then 'June' 
    When 7 Then 'July' 
    When 8 Then 'Aug' 
    When 9 Then 'Sept' 
    When 10 Then 'Oct' 
    When 11 Then 'Nov' 
    When 12 then 'Dec' 
End 
as Month, 
(Select sum(invoice_amount) from invoices where Invoice_number like 'MSP%') as 'MSP', 
(Select sum(invoice_amount) from invoices where Invoice_number like 'PS%') as'PS', 
(Select sum(invoice_amount) from invoices where Invoice_number like 'APP%') as 'App' 
from invoices 
Where convert(nvarchar(50), date_invoice,100) > DATEADD(month, -12, getdate()) 
Group by year(date_invoice), Case month(date_invoice) 
    When 1 Then 'Jan' 
    When 2 Then 'Feb' 
    When 3 Then 'March' 
    When 4 Then 'April' 
    When 5 Then 'May' 
    When 6 Then 'June' 
    When 7 Then 'July' 
    When 8 Then 'Aug' 
    When 9 Then 'Sept' 
    When 10 Then 'Oct' 
    When 11 Then 'Nov' 
    When 12 then 'Dec' 
End 
Order by year(date_invoice), month(date_invoice) 

Answer 2

有一個派生表在一組。

使用CASE表達式來做條件SUM's。

select year, month, 
     sum(case when Invoice_number like 'MSP%' then invoice_amount end) as 'MSP', 
     sum(case when Invoice_number like 'PS%' then invoice_amount end) as 'PS', 
     sum(case when Invoice_number like 'APP%' then invoice_amount end) as 'APP' 
from 
(
select date_invoice, 
     Invoice_number 
     year(date_invoice) as Year, 
     case month(date_invoice) 
     When 1 Then 'Jan' 
     When 2 Then 'Feb' 
     When 3 Then 'March' 
     When 4 Then 'April' 
     When 5 Then 'May' 
     When 6 Then 'June' 
     When 7 Then 'July' 
     When 8 Then 'Aug' 
     When 9 Then 'Sept' 
     When 10 Then 'Oct' 
     When 11 Then 'Nov' 
     When 12 then 'Dec' 
     End as Month, 
     invoice_amount 
from invoices 
where convert(nvarchar(50), date_invoice,100) > DATEADD(month, -12, getdate()) 
) as dt 
Group by year, month 
Order by year, month 

Answer 3

選擇年，月， 總和（情況下INVOICE_NUMBER像 'MSP％' 然後INVOICE_AMOUNT結束）爲 'MSP'， 總和（情況下INVOICE_NUMBER像 'PS％'，那麼INVOICE_AMOUNT結束）爲「PS ' 總和（情況下INVOICE_NUMBER像 'APP％' 然後INVOICE_AMOUNT結束）爲 'APP' 從 （ 選擇date_invoice， INVOICE_NUMBER 年（date_invoice）爲一年， 情況下一個月（date_invoice） 當1然後' Jan' When 2 Then'Feb' When 3 Then'March' 當4接着「四月」 當5接着「月」 當6於是「六月」 當7接着「月」 當8接着「月」 當9於是「九月」 當10然後「月」 當11然後 '月' 當12隨後 '月' 完如月， INVOICE_AMOUNT 從發票 其中轉換（爲nvarchar（50），date_invoice，100）> DATEADD（月，-12，GETDATE（）） ） as dt 按年份，月份分組 按年，月排序