Question

我有多个交易的受益人。在主页上，我想显示客户创建的最新交易。因此，最新交易的受益人应该获得金额详情。我创建了这样的查询。但它并没有显示最新的交易。

$clause = "SELECT b.*, tran.transfer_amount, tran.date_added as tran_date_added
           FROM beneficiary b
           LEFT JOIN customer_beneficiary_mapping cbm ON b.id = cbm.ben_id
           LEFT JOIN
            (SELECT ben_id, transfer_amount, date_added
             FROM transaction
             GROUP BY ben_id
             ) tran
            ON tran.ben_id = b.id
            INNER JOIN system_country_list scl ON scl.country_id = b.ben_country
            AND cbm.cus_id = '$cus_id'
            ORDER BY tran.date_added DESC
            ";

Answer 1

也许这有效：

SELECT b.*, tran.transfer_amount, tran.date_added as tran_date_added
FROM beneficiary b
LEFT JOIN customer_beneficiary_mapping cbm ON b.id = cbm.ben_id
LEFT JOIN
    (SELECT ben_id, transfer_amount, date_added
     FROM transaction
     GROUP BY ben_id
     ) tran
ON tran.ben_id = b.id
AND tran.date_added = (SELECT MAX(date_added) FROM transaction WHERE ben_id = b.id)
INNER JOIN system_country_list scl ON scl.country_id = b.ben_country
AND cbm.cus_id = '$cus_id'
ORDER BY tran.date_added DESC

请注意，我刚在where子句中添加了一个子选择：AND tran.date_added = (SELECT MAX(date_added) FROM transaction WHERE ben_id = b.id)

Answer 2

我找到了解决方案。如果有人需要，我会发布答案，而不是删除问题。

$clause = "SELECT b.*, tran.transfer_amount, tran.date_added as tran_date_added
       FROM beneficiary b
       LEFT JOIN customer_beneficiary_mapping cbm ON b.id = cbm.ben_id
       LEFT JOIN
        (SELECT ben_id, transfer_amount, date_added
         FROM transaction
         GROUP BY ben_id
         ORDER BY 1 DESC        <----- Added this line
         ) tran
        ON tran.ben_id = b.id
        INNER JOIN system_country_list scl ON scl.country_id = b.ben_country
        AND cbm.cus_id = '$cus_id'
        ORDER BY tran.date_added DESC
        ";

我仍然不知道，它现在怎么样了。我之前也试过ORDER BY date_added DESC。但是，它没有用。无论如何，它现在正在运作。：）

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