我需要一些幫助與此查詢MySQL的SUM CASE自加入

這是我的查詢

price received qty recieved price release qty release  
    10.30    10    0    0     
    0     0    10.30   2 
    0     0    10.30   1 
    19.20    20    0    0 
    0     0    19.20   5      
    0     0    19.20   3     
    0     0    19.20   1

的實際結果我的查詢中使用此代碼

$result = mysql_query("SELECT *, 
    SUM(CASE WHEN qtyreceived > 0 THEN qtyreceived END) AS qtyrec, 
    SUM(CASE WHEN qtyrelease > 0 THEN qtyrelease END) AS qtyrel 
    FROM stockledger 
    WHERE stockdesc= '$_POST[desc]' GROUP BY pricerelease,pricereceived ");

的結果是

價格收到qtyreceived價格釋放qtyrelease巴爾 10.30 10 10 19.20 20 20 10.30 3-3 19.20 9 -9

，我想查看結果這樣，所以我可以得到剩餘數量爲2倍的價格

price received  qtyreceived price release qtyrelease bal 
     10.30   10    10.30   3  7 
     19.20   20    19.20   9  11

感謝.... 。

來源

2012-08-07 mon9

你怎麼會知道'10'將'加入-3'和'20'將'加入-9' ？ – 2012-08-07 05:52:58

可以提供一些原始樣本數據嗎？ – sel 2012-08-07 05:53:46

從看到您的數據，我認爲它將基於價格。對？試試這個。

SELECT a.PriceReceived, 
     a.qtyreceived, 
     b.priceRelease, 
     b.qtyRelease, 
     (a.bal + b.bal) as bal 
FROM stockledger a 
      INNER JOIN stockledger b 
       ON a.priceReceived = b.priceRelease

或另一種選擇是

SELECT a.PriceReceived, 
     a.qtyreceived, 
     b.priceRelease, 
     b.qtyRelease, 
     (a.qtyreceived - b.qtyRelease) as bal 
FROM stockledger a 
      INNER JOIN stockledger b 
       ON a.priceReceived = b.priceRelease

SQLFiddle Demo

來源

2012-08-07 05:56:34

MySQL的SUM CASE自加入

回答

SQLFiddle Demo

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