加入多個sum sql語句

如何加入多個sql語句。我需要在一個視圖中顯示分別2004,2008,2009和加入多個sum sql語句

SELECT SUM(ACQUISITIONPRICE) AS YEAR_2007 
FROM TRANS 
WHERE DATEACQUIRED LIKE '%07'; 

SELECT SUM(ACQUISITIONPRICE) AS YEAR_2008 
FROM TRANS 
WHERE DATEACQUIRED LIKE '%08'; 

SELECT SUM(ACQUISITIONPRICE) AS YEAR_2009 
FROM TRANS 
WHERE DATEACQUIRED LIKE '%09';

來源

2015-09-14 CJM

所以只需使用GROUP BY像這樣：

SELECT SUM(ACQUISITIONPRICE) AS TOTALPRICE 
, EXTRACT(year from DATEACQUIRED) AS YEAR 
FROM TRANS 
GROUP BY EXTRACT(year from DATEACQUIRED) 
ORDER BY YEAR

如果你真的想在一排「加入」所有這些，有具體列名，您可以執行以下操作（儘管此方法不太靈活，因爲每年都必須手動修改查詢）。 還要注意，雖然問題明確提到了「加入」結果，但下面所示的加入完全沒有必要。每列可以簡單地成爲沒有任何連接的select子句的一部分。（here is the SqlFiddle）

SELECT * FROM 
(SELECT SUM(ACQUISITIONPRICE) AS YEAR_2007 
FROM TRANS 
WHERE EXTRACT(year from DATEACQUIRED) = 2007) a 
JOIN 
(SELECT SUM(ACQUISITIONPRICE) AS YEAR_2008 
FROM TRANS 
WHERE EXTRACT(year from DATEACQUIRED) = 2008) b ON 1=1 
JOIN 
(SELECT SUM(ACQUISITIONPRICE) AS YEAR_2009 
FROM TRANS 
WHERE EXTRACT(year from DATEACQUIRED) = 2009) c ON 1=1

如果你想在一個單列的結果，一個最好的方法是使用一個子選擇與dual如圖this fiddle：

SELECT 
    (SELECT SUM(ACQUISITIONPRICE) FROM TRANS WHERE EXTRACT(year from DATEACQUIRED) = 2007) AS YEAR_2007 
, (SELECT SUM(ACQUISITIONPRICE) FROM TRANS WHERE EXTRACT(year from DATEACQUIRED) = 2008) AS YEAR_2008 
, (SELECT SUM(ACQUISITIONPRICE) FROM TRANS WHERE EXTRACT(year from DATEACQUIRED) = 2009) AS YEAR_2009 
FROM dual

當涉及到性能，唯一真正可以肯定的方法是在特定情況下測試它，但the SUM (CASE... approach shown by @Indra-Prakash-Tiwari在大多數情況下可能表現更好（if oracle behaves anything like sql server）

來源

2015-09-14 05:09:09 Nathan

非常感謝你。 – CJM

檢查此sql fiddle

我已經處理了你的需求，並且看起來很容易。

SELECT SUM(ACQUISITIONPRICE) AS TOTALPRICE 
, EXTRACT(year from DATEACQUIRED) AS YEAR 
FROM TRANS 
GROUP BY EXTRACT(year from DATEACQUIRED) 
ORDER BY YEAR; 


SELECT Sum(CASE 
      WHEN Extract(year FROM dateacquired) = 2007 THEN acquisitionprice 
      ELSE 0 
      END) AS YEAR_2007, 
     Sum(CASE 
      WHEN Extract(year FROM dateacquired) = 2008 THEN acquisitionprice 
      ELSE 0 
      END) AS YEAR_2008, 
     Sum(CASE 
      WHEN Extract(year FROM dateacquired) = 2009 THEN acquisitionprice 
      ELSE 0 
      END) AS YEAR_2009 
FROM trans

來源

2015-09-14 05:59:59

如果這可以幫助你，請接受這個答案。 –

嘗試使用To_Char

Fiddle demo

select TO_CHAR(DATEACQUIRED,'yy') AS Years_Char,Sum(ACQUISITIONPRICE) 
FROM trans GROUP BY TO_CHAR(DATEACQUIRED,'yy')

來源

2015-09-14 06:14:08

加入多個sum sql語句

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