SQL滾動3個月總有Yearmonth

您好我有，如果交易被處理其中有賬戶，yearmonth和貿易計數SQL滾動3個月總有Yearmonth

account Yearmonth Trade_count 
XXXXX  201701  1 
XXXXX  201701  0 
XXXXX  201702  1 
XXXXX  201703  1 
XXXXX  201704  1 
XXXXX  201704  1 
XXXXX  201705  1

的trade_count爲1的數據集和0，如果沒有處理

我想輸出這樣

Account Yearmonth Total_Trades_Month  past_3_month trades 
XXXXX  201703   1      3 
XXXXX  201704   2      3 
XXXXX  201705   1      4

到目前爲止，我已經試過：

select yearmonth, (yearmonth - 3) as 'ym', 
SUM(Case when COMMISSION is not null and Commission > 0 then Trade_Count Else 0 END) as 'TotalTrades', 
sum(CASE when yearmonth between (yearmonth - 3) and yearmonth and commission > 0 then Trade_Count else 0 end) as 'rolling' 
sum(Trade_Count)over(partition by yearmonth) 
FROM WEALTHDB.DBO.WF_PM_DOR_DB 
group by yearmonth 
order by yearmonth

請注意，yearmonth只是一個整數，並沒有編碼爲日期。任何幫助表示讚賞

來源

2017-04-05 Data Guy

哪有失蹤幾個月？ –

您正在使用哪個SQL？現代SQL具有__window函數___，它對滾動總計非常理想。我假設'Yearmonth'是你自己的設備？ – Manngo

如果'yearmonth'是一個整數，那麼比較是否存在問題，比如'201611 + 3'和'201701'？ – Manngo

如果你有丟失數據沒有個月（如您的示例數據），你可以這樣做：

select account, yearmonth, 
     sum(trade_count) as TotalTrades, 
     sum(sum(trade_count)) over (partition by account order by yearmonth 
            rows between 2 preceding and current row 
           ) as past_3_month_trades 
from WEALTHDB.DBO.WF_PM_DOR_DB 
group by account, yearmonth 
order by yearmonth

來源

2017-04-05 02:16:34

SQL滾動3個月總有Yearmonth

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