错误代码1241：操作数应包含1列。怎么了？

Question

    SELECT 
    SUM(CASE
        WHEN db1.card_type = 'debit' THEN 1
        ELSE 0
    END) AS DEBIT,
    SUM(CASE
        WHEN db1.card_type = 'credit' THEN 1
        ELSE 0
    END) AS CREDIT,
    DATE_FORMAT(Latest, '%Y-%m') AS Dato
FROM
    (SELECT 
        pp.debtor_id, pp.card_type, MAX(pp.created) AS Latest
    FROM
        capital.credit_card cc
    JOIN capital.card_to_debtor ctd ON cc.id = ctd.card_id
        AND debtor_id IN (SELECT 
            fs.debtor_id, fs.created, fs.reason
        FROM
            analysis.full_settlement fs
        WHERE
            ((reason = 'BANK_PAYMENT'
                OR fs.reason = 'CARD_PAYMENT')
                AND fs.amount < 0)
                OR fs.REASON = 'TRIVIAL_BALANCE'
                OR fs.id = 13793327
                OR fs.id = 7451808)
    JOIN analysis.full_settlement fs ON fs.debtor_id = ctd.debtor_id
    JOIN (SELECT 
        p.debtor_id, ccc.card_type, p.created
    FROM
        capital.payment p
    JOIN capital.card_subscription cs ON cs.id = p.subscription_id
    JOIN (SELECT 
        cc.id, ctd.card_id, cc.card_type, ctd.debtor_id
    FROM
        capital.card_to_debtor ctd
    JOIN capital.credit_card cc ON cc.id = ctd.card_id) ccc ON ccc.card_id = cs.card_id
        AND ccc.debtor_id = p.debtor_id) pp ON fs.debtor_id = pp.debtor_id
        AND pp.created <= fs.created
    GROUP BY pp.debtor_id , fs.created) db
        JOIN
    (SELECT 
        p.debtor_id, ccc.card_type, p.created
    FROM
        capital.payment p
    JOIN capital.card_subscription cs ON cs.id = p.subscription_id
    JOIN (SELECT 
        cc.id, ctd.card_id, cc.card_type, ctd.debtor_id
    FROM
        capital.card_to_debtor ctd
    JOIN capital.credit_card cc ON cc.id = ctd.card_id) ccc ON ccc.card_id = cs.card_id
        AND ccc.debtor_id = p.debtor_id) db1 ON db1.debtor_id = db.debtor_id
        AND db1.created = db.Latest
GROUP BY YEAR(Latest) , MONTH(Latest)

Answer 1

debtor_id IN (SELECT 
            fs.debtor_id, fs.created, fs.reason

debtor_id是一列，因此您只能将其与其他列进行比较。将其更改为

debtor_id IN (SELECT 
                fs.debtor_id FROM...