根据另一列，其中一列具有MAX值，为一列选择MAX值

Question

我有一个表数据，来自不同的表格。我只想在第3栏有价值＆＃39;债务＆＃39; AND 1st column(DATE)具有最大值。最终值基于MAX(DATE)而非MAX(PRICE)。所以用简单的语言就是这样来的

IF(MAX(DATE) && TYPE = 'debt'){
   MAX(PRICE);
}

以下是可用数据的图像视图。

我正在使用的当前查询位于

之下

SELECT
    MAX(CASE WHEN PAYMENTS.PAYMENT = 'debt' AND RECEIPTS.DATENEW THEN PAYMENTS.TOTAL END) AS TAKENDEBT,
    (CASE WHEN PAYMENTS.PAYMENT = 'debtpaid' THEN PAYMENTS.TOTAL END) AS GIVENDEBT,
    MAX(CASE WHEN PAYMENTS.PAYMENT = 'debt' THEN RECEIPTS.DATENEW END) AS TAKENDATE,
    MAX(CASE WHEN PAYMENTS.PAYMENT = 'debtpaid' THEN RECEIPTS.DATENEW END) AS GIVENDATE,
    (MAX(CASE WHEN PAYMENTS.PAYMENT = 'debt' THEN PAYMENTS.TOTAL END) + SUM((CASE WHEN PAYMENTS.PAYMENT = 'debtpaid' THEN PAYMENTS.TOTAL END))) AS DUE,        
    CASE WHEN PAYMENTS.PAYMENT = 'debt' OR PAYMENTS.PAYMENT = 'debtpaid' THEN CUSTOMERS.NAME END AS CUSTOMER 
FROM RECEIPTS
    INNER JOIN TICKETS ON RECEIPTS.ID = TICKETS.ID
    INNER JOIN PAYMENTS ON RECEIPTS.ID = PAYMENTS.RECEIPT
    INNER JOIN CUSTOMERS ON TICKETS.CUSTOMER = CUSTOMERS.ID
WHERE
    (PAYMENTS.PAYMENT = 'debt'
    OR PAYMENTS.PAYMENT = 'debtpaid')
GROUP BY CUSTOMER
ORDER BY DUE DESC

它给我输出如下所示的红色圆圈，而我需要绿色圆圈中的值。这意味着它基于MAX（PRICE）获得价值，而我需要基于MAX（DATE）然后MAX（PRICE），因为同一日期可能有多个值。

请不要问我要把数据放在FIDDLE THING中，它是我管理的数据库的一部分，它有这个查询并且现在想要在相同的结构上。致谢

Answer 1

尝试类似以下的解决方案：

SELECT date, max(price) FROM yourTable 
  WHERE payment='debt' AND date = ( SELECT max(date) From yourTable)
  GROUP BY date

或

SELECT date ,max(price) FROM yourTable
  WHERE payment='debt'
  GROUP BY date
  ORDER BY date DESC
  LIMIT 1