來自多個子查詢MYSQL的視圖

Question

我有一個數學代碼，需要兩個子查詢。 下面是代碼的副本。

SELECT AVGTEMP_X.Average_Temp, ProduceMonAvg.Avergae_CPI,
SUM(AVGTEMP_X.Average_Temp) as AVGTEMPSUM,
SUM(ProduceMonAvg.Average_CPI) as PROCPISUM,
SUM(AVGTEMP_X.Average_Temp*AVGTEMP_X.Average_Temp) AS AVGTEMPSQ,
SUM(ProduceMonAvg.Average_CPI*ProduceMonAvg.Average_CPI)PROCPISQ,
SUM(AVGTEMP_X.Average_Temp*ProduceMonAvg.Average_CPI) AS PowerSum,
COUNT(*) as COUNT,
(COUNT*(PowerSum)-(AVGTEMPSUM))/(sqrt(COUNT*(AVGTEMPSQ)-pow(AVGTEMPSUM,2)*
    (COUNT*(PROCPISQ)-pow(PROCPISUM,2)))) AS Correlation
FROM(SELECT series_id,FORMAT(AVG(value),2) AS Average_CPI, period
FROM CURRENT
WHERE series_id = 'CUSR0000SEFK'
AND theYear >=(1997)
AND theYear <=(2010)
GROUP BY period) AS ProduceMonAvg,
(SELECT Average_Temp
FROM AVGTEMP_X)
INNER JOIN ProduceMonAvg
ON AVGTEMP_X.period = ProduceMonAvg.period

我說錯了

1146-表'xxx.ProduceMonAvg'不存在

1054-“字段列表”中的未知列“ COUNT”

Answer 1

在外部查詢中，引用ProdcueMonAvg.Average_CPI等。在內部查詢中，將其別名為AS ProduceMonAvg 。 注意錯字Prodcue與Produce 。 您確定您的錯誤沒有說Table xxx.ProdcueMonAvg doesn't exist嗎？

就此而言，您的查詢還有其他幾處問題。 您對AVGTEMP_X查詢的聯接使用的是不需要子查詢的子查詢，它還在執行交叉聯接，然后是內部聯接。 我懷疑那是你想要的。 試試這個：

    SELECT AVGTEMP_X.Average_Temp,
    ProduceMonAvg.Average_CPI,
    SUM(AVGTEMP_X.Average_Temp) AS AVGTEMPSUM,
    SUM(ProduceMonAvg.Average_CPI) AS PROCPISUM,
     SUM(AVGTEMP_X.Average_Temp * AVGTEMP_X.Average_Temp) AS AVGTEMPSQ,
    SUM(ProduceMonAvg.Average_CPI * ProduceMonAvg.Average_CPI) PROCPISQ,
    SUM(AVGTEMP_X.Average_Temp * ProduceMonAvg.Average_CPI) AS PowerSum,
    COUNT(*) AS TOTAL,
     (COUNT(*) * (SUM(AVGTEMP_X.Average_Temp * ProduceMonAvg.Average_CPI)) - (SUM(AVGTEMP_X.Average_Temp))) / (sqrt(COUNT(*)* (SUM(AVGTEMP_X.Average_Temp * AVGTEMP_X.Average_Temp)) - pow(SUM(AVGTEMP_X.Average_Temp), 2) * (COUNT(*)* (SUM(ProduceMonAvg.Average_CPI * ProduceMonAvg.Average_CPI)) - pow(SUM(ProduceMonAvg.Average_CPI), 2)))) AS Correlation
FROM (
    SELECT series_id,
        FORMAT(AVG(value), 2) AS Average_CPI,
        period
    FROM CURRENT
    WHERE series_id = 'CUSR0000SEFK'
        AND theYear >= (1997)
        AND theYear <= (2010)
    GROUP BY period
    ) AS ProduceMonAvg
INNER JOIN AVGTEMP_X ON AVGTEMP_X.period = ProduceMonAvg.period

我還創建了一些模擬表和數據，並最終測試了查詢。 它返回結果。 您可以在這里看到它： http : //sqlfiddle.com/#!9/47523/14