无法通过select语句更新数据

Question

我有一个用于更新数据的sql查询：

UPDATE (
    SELECT 
        cal.year_no,
        pi.bin,
        pi.tin,
        epa.fc_fc_id,
        epa.ec_ec_id,
        NVL(epa.COMMIT_OBLIGATION, 0) as pay_amount,
        cal.month_no as months,
        EPA.PAY_AMOUNT_MONTH,
        EPA.PAY_AMOUNT_CALC_DATE
    FROM 
        summary_of_expenditures epa
        INNER JOIN calendar cal ON (epa.cal_cal_id_pay = cal.cal_id) 
        INNER JOIN public_institution pi ON (epa.pi_pi_id = pi.pi_id) 
    WHERE (
        (epa.fc_fc_id is not null) 
        AND (epa.ec_ec_id is not null) 
        AND (cal.month_no IN ('11'))
    ) 
    GROUP BY 
        cal.year_no,
        cal.month_no,
        epa.COMMIT_OBLIGATION,
        pi.bin,
        pi.tin,
        epa.fc_fc_id,
        epa.ec_ec_id,
        EPA.PAY_AMOUNT_MONTH,
        EPA.PAY_AMOUNT_CALC_DATE) 
SET 
    PAY_AMOUNT_MONTH =  pay_amount, 
    PAY_AMOUNT_CALC_DATE = SYSDATE;

当我执行它时，我有一个下面的例外：

SQL Error: ORA-01732: data manipulation operation not legal on this view. 

请告诉我，我做错了什么，或建议我的方法更新我的数据。

Answer 1

不能在关联update语句中使用GROUP BY，因为这将生成视图。