sql，c，選擇兩行最高的時間戳和兩列的組

我問同樣的問題，但沒有得到最終答案，所以，再試一次。有兩種類型的報價，回購利率或最後價格，我想選擇具有最高日期時間的回購利率，以及具有來自兩個表中最高日期時間的最後價格。這是我從第一篇文章中獲得幫助的答案，但如果兩者都存在，則需要兩個記錄（回購和最終價格）。任何人都可以請幫助改變下面的查詢：非常感謝！sql，c，選擇兩行最高的時間戳和兩列的組

SELECT QuoteObservations.id, 
     QuoteObservations.value, 
     QuoteObservations.quotePointId, 
     max(QuoteObservations.asOfTime) as asOfTime, 
     QuoteObservations.dataProviderId, 
     QuotePoints.quoteType 
FROM QuoteObservations 
INNER JOIN 
     QuotePoints 
ON  QuoteObservations.quotePointId = QuotePoints.id 
WHERE QuotePoints.quoteType in (1,2) 
group by 
     QuoteObservations.id, 
     QuoteObservations.value, 
     QuoteObservations.quotePointId, 
     QuoteObservations.dataProviderId, 
     QuotePoints.quoteType;

來源

2013-08-06 eyu

與其重新提出問題，也許您應該編輯原始問題？ – Kermit

同意上面的兩條評論。回答您之前提出的問題的評論並提供有關答案的反饋會更加恭敬。 – Andomar

我編輯了問題，並回復了評論，並且4天過去了，似乎人們很忙。謝謝。 – eyu

你要求返回兩行。以下SQL將完成您描述的內容：

SELECT TOP(1) QuoteObservations.id, 
    QuoteObservations.value, 
    QuoteObservations.quotePointId, 
    QuoteObservations.asOfTime, 
    QuoteObservations.dataProviderId, 
    QuotePoints.quoteType 
FROM QuoteObservations 
INNER JOIN QuotePoints 
ON  QuoteObservations.quotePointId = QuotePoints.id 
WHERE QuotePoints.quoteType = 1 -- Get most recent row for quoteType 1 
ORDER BY QuoteObservations.asOfTime DESC 

UNION ALL 

SELECT TOP(1) QuoteObservations.id, 
    QuoteObservations.value, 
    QuoteObservations.quotePointId, 
    QuoteObservations.asOfTime, 
    QuoteObservations.dataProviderId, 
    QuotePoints.quoteType 
FROM QuoteObservations 
INNER JOIN QuotePoints 
ON  QuoteObservations.quotePointId = QuotePoints.id 
WHERE QuotePoints.quoteType = 2 -- Get most recent row for quoteType 2 
ORDER BY QuoteObservations.asOfTime DESC

來源

2013-09-02 22:36:33 feetwet

sql，c，選擇兩行最高的時間戳和兩列的組

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