从多个子查询中选择结果

Question

从多个子查询中选择结果

sqldatabasems-access-2016

4

我正在尝试从9个不同的子查询结果中制作一张单独的表。以下是我的代码：

SELECT

APR16
FROM(
SELECT Sum(APR.[kwh]) AS APR16
FROM Peak_Times, Meter_Buckets INNER JOIN APR ON Meter_Buckets.METER = APR.meter
WHERE (((APR.strdatetime)=[Peak_Times].[strdatetime]) AND ((Meter_Buckets.BUCKET)=1)) AND APR.kwh IS NOT NULL)
,

MAY16
FROM(
SELECT Sum(MAY.[kwh]) AS MAY16
FROM Peak_Times, Meter_Buckets INNER JOIN MAY ON Meter_Buckets.METER = MAY.meter
WHERE (((MAY.strdatetime)=[Peak_Times].[strdatetime]) AND ((Meter_Buckets.BUCKET)=1)) AND MAY.kwh IS NOT NULL)
,

JUN16
FROM(
SELECT Sum(JUN.[kwh]) AS JUN16
FROM Peak_Times, Meter_Buckets INNER JOIN JUN ON Meter_Buckets.METER = JUN.meter
WHERE (((JUN.strdatetime)=[Peak_Times].[strdatetime]) AND ((Meter_Buckets.BUCKET)=1)) AND JUN.kwh IS NOT NULL)
,

JUL16
FROM(
SELECT Sum(JUL.[kwh]) AS JUL16
FROM Peak_Times, Meter_Buckets INNER JOIN JUL ON Meter_Buckets.METER = JUL.meter
WHERE (((JUL.strdatetime)=[Peak_Times].[strdatetime]) AND ((Meter_Buckets.BUCKET)=1)) AND JUL.kwh IS NOT NULL)
,

AUG16
FROM(
SELECT Sum(AUG.[kwh]) AS AUG16
FROM Peak_Times, Meter_Buckets INNER JOIN AUG ON Meter_Buckets.METER = AUG.meter
WHERE (((AUG.strdatetime)=[Peak_Times].[strdatetime]) AND ((Meter_Buckets.BUCKET)=1)) AND AUG.kwh IS NOT NULL)
,

SEP16
FROM(
SELECT Sum(SEP.[kwh]) AS SEP16
FROM Peak_Times, Meter_Buckets INNER JOIN SEP ON Meter_Buckets.METER = SEP.meter
WHERE (((SEP.strdatetime)=[Peak_Times].[strdatetime]) AND ((Meter_Buckets.BUCKET)=1)) AND SEP.kwh IS NOT NULL)
,

OCT16
FROM(
SELECT Sum(OCT.[kwh]) AS OCT16
FROM Peak_Times, Meter_Buckets INNER JOIN OCT ON Meter_Buckets.METER = OCT.meter
WHERE (((OCT.strdatetime)=[Peak_Times].[strdatetime]) AND ((Meter_Buckets.BUCKET)=1)) AND OCT.kwh IS NOT NULL)
,

NOV16
FROM(
SELECT Sum(NOV.[kwh]) AS NOV16
FROM Peak_Times, Meter_Buckets INNER JOIN NOV ON Meter_Buckets.METER = NOV.meter
WHERE (((NOV.strdatetime)=[Peak_Times].[strdatetime]) AND ((Meter_Buckets.BUCKET)=1)) AND NOV.kwh IS NOT NULL)
,

DEC16
FROM(
SELECT Sum(DEC.[kwh]) AS DEC16
FROM Peak_Times, Meter_Buckets INNER JOIN DEC ON Meter_Buckets.METER = DEC.meter
WHERE (((DEC.strdatetime)=[Peak_Times].[strdatetime]) AND ((Meter_Buckets.BUCKET)=1)) AND DEC.kwh IS NOT NULL)

如果我只执行第一个子查询，

SELECT

APR16
FROM(
SELECT Sum(APR.[kwh]) AS APR16
FROM Peak_Times, Meter_Buckets INNER JOIN APR ON Meter_Buckets.METER = APR.meter
WHERE (((APR.strdatetime)=[Peak_Times].[strdatetime]) AND ((Meter_Buckets.BUCKET)=1)) AND APR.kwh IS NOT NULL);

它返回一个没有错误的结果。但是当我尝试像上面那样将它们全部连接在一起时，它会在第二个FROM处给出语法错误。我想要一个类似于这样的结果：

APR16|MAY16|JUN16
57212|45681|721

有人能告诉我正确的语法来做到这一点吗？这可能是我忽视了的简单问题，也可能是我无法做到的问题。提前感谢您的帮助。

- Dustin Knight

3个回答

1

类似这样的东西可能有效：

WITH
APR16 as ( select ... apr16 from ...),
MAY16 as ( select ... may16 from ...),
JUN16 as ( select ... jun16 from ...)
select apr16,may16,jun16 from APR16, MAY16, JUN16;

然而，我认为这并不是解决这个旋转问题最优雅的方法。一些数据库支持结果旋转，我不确定ms-access-2016是否属于其中之一（我也不确定它是否支持WITH子句）。

- Kjetil S.

1

尝试像这样做些什么。

    SELECT a.AUG16, b.JUN16
    FROM
    (SELECT Sum(AUG.[kwh]) AS AUG16
    FROM Peak_Times, Meter_Buckets INNER JOIN AUG ON Meter_Buckets.METER = AUG.meter
    WHERE (((AUG.strdatetime)=[Peak_Times].[strdatetime]) AND ((Meter_Buckets.BUCKET)=1)) AND AUG.kwh IS NOT NULL)
) a
,
    (FROM(
    SELECT Sum(JUN.[kwh]) AS JUN16
    FROM Peak_Times, Meter_Buckets INNER JOIN JUN ON Meter_Buckets.METER = JUN.meter
    WHERE (((JUN.strdatetime)=[Peak_Times].[strdatetime]) AND ((Meter_Buckets.BUCKET)=1)) AND JUN.kwh IS NOT NULL)
) b

- user1854438

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- dana · Accepted Answer

您可以通过以下方式以所需格式获取多个子查询的结果：

select
    (select count(*) from table1) as result1,
    (select count(*) from table2) as result2,
    ..

应用于您的查询，它会像这样：

SELECT
    (SELECT Sum(APR.[kwh])
    FROM Peak_Times, Meter_Buckets INNER JOIN APR ON Meter_Buckets.METER = APR.meter
    WHERE (((APR.strdatetime)=[Peak_Times].[strdatetime]) AND ((Meter_Buckets.BUCKET)=1)) AND APR.kwh IS NOT NULL)
     AS APR16
    ,
    (SELECT Sum(MAY.[kwh])
    FROM Peak_Times, Meter_Buckets INNER JOIN MAY ON Meter_Buckets.METER = MAY.meter
    WHERE (((MAY.strdatetime)=[Peak_Times].[strdatetime]) AND ((Meter_Buckets.BUCKET)=1)) AND MAY.kwh IS NOT NULL)
     AS MAY16
    ,
    (SELECT Sum(JUN.[kwh])
    FROM Peak_Times, Meter_Buckets INNER JOIN JUN ON Meter_Buckets.METER = JUN.meter
    WHERE (((JUN.strdatetime)=[Peak_Times].[strdatetime]) AND ((Meter_Buckets.BUCKET)=1)) AND JUN.kwh IS NOT NULL)
     AS JUN16
    ,
    (SELECT Sum(JUL.[kwh])
    FROM Peak_Times, Meter_Buckets INNER JOIN JUL ON Meter_Buckets.METER = JUL.meter
    WHERE (((JUL.strdatetime)=[Peak_Times].[strdatetime]) AND ((Meter_Buckets.BUCKET)=1)) AND JUL.kwh IS NOT NULL)
     AS JUL16
    ,
    (SELECT Sum(AUG.[kwh])
    FROM Peak_Times, Meter_Buckets INNER JOIN AUG ON Meter_Buckets.METER = AUG.meter
    WHERE (((AUG.strdatetime)=[Peak_Times].[strdatetime]) AND ((Meter_Buckets.BUCKET)=1)) AND AUG.kwh IS NOT NULL)
     AS AUG16
    ,
    (SELECT Sum(SEP.[kwh])
    FROM Peak_Times, Meter_Buckets INNER JOIN SEP ON Meter_Buckets.METER = SEP.meter
    WHERE (((SEP.strdatetime)=[Peak_Times].[strdatetime]) AND ((Meter_Buckets.BUCKET)=1)) AND SEP.kwh IS NOT NULL)
     AS SEP16
    ,
    (SELECT Sum(OCT.[kwh])
    FROM Peak_Times, Meter_Buckets INNER JOIN OCT ON Meter_Buckets.METER = OCT.meter
    WHERE (((OCT.strdatetime)=[Peak_Times].[strdatetime]) AND ((Meter_Buckets.BUCKET)=1)) AND OCT.kwh IS NOT NULL)
     AS OCT16
    ,
    (SELECT Sum(NOV.[kwh])
    FROM Peak_Times, Meter_Buckets INNER JOIN NOV ON Meter_Buckets.METER = NOV.meter
    WHERE (((NOV.strdatetime)=[Peak_Times].[strdatetime]) AND ((Meter_Buckets.BUCKET)=1)) AND NOV.kwh IS NOT NULL)
     AS NOV16
    ,
    (SELECT Sum(DEC.[kwh])
    FROM Peak_Times, Meter_Buckets INNER JOIN DEC ON Meter_Buckets.METER = DEC.meter
    WHERE (((DEC.strdatetime)=[Peak_Times].[strdatetime]) AND ((Meter_Buckets.BUCKET)=1)) AND DEC.kwh IS NOT NULL)
     AS DEC16