根據不同條件在mysql php中選擇列

Question

我需要此代碼的幫助。 我做錯了什么。 我想要一個結果，可以給我按當前和以前的收益列中的商業，住宅和農業基本列數量分組。 如何完成此代碼或提供更好的建議。 先感謝您。

SELECT  (CASE (c.classcode)
         WHEN 'C' THEN 'COMMERCIAL'
         WHEN 'R' THEN 'RESIDENTIAL'
         WHEN 'A' THEN 'AGRICULTURE' END) AS CLASSIFICATION,
        ( SELECT  SUM(a.basic)
            FROM  cashreceiptitem_rpt_online a
            JOIN  cashreceipt_rpt b  ON a.rptreceiptid=b.objid
            JOIN  rptledger c  ON a.rptledgerid=c.objid
            WHERE  b.month='11'
              AND  a.revperiod='current'
        ) AS BC, 
        ( SELECT  SUM(a.basic)
            FROM  cashreceiptitem_rpt_online a
            JOIN  cashreceipt_rpt b  ON a.rptreceiptid=b.objid
            JOIN  rptledger c  ON a.rptledgerid=c.objid
            WHERE  b.month='11'
              AND  a.revperiod='previous'
        ) AS BPC
    FROM  cashreceiptitem_rpt_online a
    JOIN  cashreceipt_rpt b  ON a.rptreceiptid=b.objid
    JOIN  rptledger c  ON a.rptledgerid=c.objid
    WHERE  b.month='11'

我有此錯誤Error Code: 1242; Subquery returns more than 1 row. Error Code: 1242; Subquery returns more than 1 row.

Answer 1

不確定您的表結構，但您應該可以執行以下操作：

SELECT c.classcode, SUM(a.basic), SUM(aprev.basic)
FROM cashreceiptitem_rpt_online a
JOIN cashreceiptitem_rpt_online aprev 
    ON a.rptreceiptid = aprev.rptreceiptid
JOIN cashreceipt_rpt b ON a.rptreceiptid=b.objid
JOIN cashreceipt_rpt bprev ON a.rptreceiptid=bprev.objid
JOIN rptledger c ON a.rptledgerid=c.objid
WHERE b.month='11' AND bprev.month='11'
AND a.revperiod='current' AND aprev.revperiod = 'previous'
GROUP BY c.classcode;

您需要為表的主鍵找出合適的聯接。