使用嵌套SELECT无效使用聚合函数

Question

我正在使用Squirrel SQL和Sybase SQL Anywhere 12中的数据库。我正在尝试构建一个报告，从多个不同的表中提取数据并将它们呈现在1 x中表 - 不是最佳实践，而是我能想到的唯一选择。

但这就是问题所在。我尝试将parta.Name = partb.Name简单的INNER JOIN加入到A部分和B部分中。 A部分和B部分单独运行，但一旦JOIN发生， wham ，聚合函数的使用无效。经过测试，我发现A部分就是问题所在。代码如下 - 我在这组代码下面取出了所有内容，仍然使用无效的聚合使用命中了我。我不知道自己做错了什么，特别是因为A和B部分都是孤立的！有没有人有任何想法？

SELECT * FROM
(
SELECT
    'Company A' AS MSPName
    ,
    -- COUNT ORDERS MADE BY MSP COMPANIES AFTER THEIR ENROLL DATES -- COUNT ORDERS MADE BY MSP COMPANIES AFTER THEIR ENROLL DATES -- COUNT ORDERS MADE BY MSP COMPANIES AFTER THEIR ENROLL DATES
    (
    SELECT
        COUNT(DISTINCT order_id) AS CountOrdersAfterEnroll
    FROM
        reporting.msp msp
        INNER JOIN
        iquser.dm_order_d orders
        ON
        msp.ClientID = orders.client_id
    WHERE
        -- right company
        msp.ClientName /*TARGETING*/ LIKE 'Company A%'
        AND
        -- right time
            ((date_filled IS NOT NULL AND date_filled >= msp.EnrollDate)
                -- filled it
                OR
                -- we didn't fill it
            (date_filled IS NULL AND order_create_date >= msp.EnrollDate))
        AND
        order_status_id IN (2, 5, 8, 9, 10, 12)
            -- these are the only ones we care about
    ) AS CountOrdersAfterEnroll
    -- a lot of other similar code
    (
    SELECT
        CASE
            WHEN CountFilledOrdersAfterEnroll = 0
                THEN NULL
            ELSE
                SUM(CASE
                    WHEN field_value = 'More than 20'
                        THEN 21.000
                    ELSE
                        CAST(field_value AS DECIMAL(12, 4))  --12 digits long, 4 behind the decimal mark. I'm not sure how this handles mantissa length retention, though.
                    END) * 1.0 -- for floats, JIC the DECIMAL cast didn't work out?
                /   --DIVIDE BY
                CountFilledOrdersAfterEnroll
        END
    FROM
        -- Q&A
        iquser.custom_field CF
        LEFT JOIN
        --answers
        iquser.custom_field_value CFV
        ON
        CF.custom_field_id = CFV.custom_field_id
        -- order details for these Q&A
        LEFT JOIN
        iquser.dm_order_d orders
        ON
        CFV.order_id = orders.order_id
        -- now Q&A from ONLY the MSPs
        -- right company
        INNER JOIN
        reporting.msp msp
        ON
        msp.ClientID = CF.client_id
    WHERE
        -- right company
        msp.ClientName /*TARGETING*/ LIKE 'Company A%'
        AND
        -- right time
        ((date_filled IS NULL AND order_create_date >= msp.EnrollDate)
            -- we didn't fill it
            OR
            -- we did fill it
        (date_filled IS NOT NULL and date_filled >= msp.EnrollDate))
        AND
        CFV.field_value != 'zShared Services Only - SSNA'
        AND
        CF.field_name /*QUESTION TARGETING*/ LIKE 'How many candidates did we extend offers to after the client had selected%'
    ) AS CandidatesExtendedPerFilled
) parta
LEFT JOIN
(
SELECT
    'Company A' AS MSPName
    ,
--other code of PartB
) partb
ON
parta.MSPName = partb.MSPName