来自多个子查询MYSQL的视图

Question

我有一个数学代码，需要两个子查询。 下面是代码的副本。

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

我说错了

1146-表'xxx.ProduceMonAvg'不存在

1054-“字段列表”中的未知列“ COUNT”

Answer 1

在外部查询中，引用ProdcueMonAvg.Average_CPI等。在内部查询中，将其别名为AS ProduceMonAvg 。 注意错字Prodcue与Produce 。 您确定您的错误没有说Table xxx.ProdcueMonAvg doesn't exist吗？

就此而言，您的查询还有其他几处问题。 您对AVGTEMP_X查询的联接使用的是不需要子查询的子查询，它还在执行交叉联接，然后是内部联接。 我怀疑那是你想要的。 试试这个：

    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

我还创建了一些模拟表和数据，并最终测试了查询。 它返回结果。 您可以在这里看到它： http : //sqlfiddle.com/#!9/47523/14