Question

我是初学者，需要一些帮助。尝试使用多个表中的数据更新表并在几个月或几周内对它们进行分组

update monthly_report
SET De_Ative = (SELECT IFNULL(sum(statuschange.NUM_STATUS_CHANGES),0) FROM statuschange
WHERE month(STR_TO_DATE(statuschange.Evaluation_day,'%d.%m.%Y')) = monthly_report.Mon
AND statuschange.STATUS_CHANGE ='CANCEL' OR statuschange.STATUS_CHANGE ='LOCK'
group by month(STR_TO_DATE(statuschange.Evaluation_day,'%d.%m.%Y')))

[SQL] update monthly_report
SET De_Ative = (SELECT IFNULL(sum(statuschange.NUM_STATUS_CHANGES),0) FROM statuschange
WHERE month(STR_TO_DATE(statuschange.Evaluation_day,'%d.%m.%Y')) = monthly_report.Mon
AND statuschange.STATUS_CHANGE ='CANCEL' OR statuschange.STATUS_CHANGE ='LOCK'
group by month(STR_TO_DATE(statuschange.Evaluation_day,'%d.%m.%Y')))

-- group by monthly_report.Mon

[Err] 1242 - Subquery returns more than 1 row

Answer 1

试试这个，

UPDATE  monthly_report a
        LEFT JOIN
        (
            SELECT  MONTH(STR_TO_DATE(a.Evaluation_day,'%d.%m.%Y')) mnt,
                    SUM(a.NUM_STATUS_CHANGES) totalSum
            FROM    statuschange a
            WHERE   a.STATUS_CHANGE IN ('CANCEL', 'LOCK')
            GROUP   BY MONTH(STR_TO_DATE(a.Evaluation_day,'%d.%m.%Y'))
        ) b ON b.mnt = a.mon
SET     a.De_Ative = IFNULL(b.totalSum, 0)

使用来自多个表的数据更新表并按月分组 -

1 个答案: