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  • 解决MySQL update:You can't specify target table for update in FROM clause

    MySQL中You can't specify target table for update in FROM clause错误的意思是说,不能先select出同一表中的某些值,再update这个表(在同一语句中)。 例如下面这个sql:

    update 
        tms_jyxx_mx 
    set 
        gg_dm = '1004' 
    where 
        jyxx_id 
    in 
        (SELECT
            t1.jyxx_id as jyxx_id
        FROM
            tms_jyxx t1,
            tms_jyxx_mx t2
        WHERE
            t1.sjmc = '保定白沟新城铭磊加油站'
        AND t1.jyxx_id = t2.jyxx_id
        AND t2.ljqh = '14'
        AND t2.jysj >= '2019-04-30 10:17:22'
        AND t2.jysj <= '2019-09-26 23:59:59'
        ORDER BY
            t2.jysj
        desc)

    改成下面的就行了:

    update 
        tms_jyxx_mx 
    set 
        gg_dm = '1004' 
    where 
        jyxx_id 
    in 
        (SELECT
            tt.jyxx_id
        from
        (SELECT
            t1.jyxx_id as jyxx_id
        FROM
            tms_jyxx t1,
            tms_jyxx_mx t2
        WHERE
            t1.sjmc = '保定白沟新城铭磊加油站'
        AND t1.jyxx_id = t2.jyxx_id
        AND t2.ljqh = '14'
        AND t2.jysj >= '2019-04-30 10:17:22'
        AND t2.jysj <= '2019-09-26 23:59:59'
        ORDER BY
            t2.jysj
        desc) tt)

    也就是说将select出的结果再通过中间表select一遍,这样就规避了错误。注意,这个问题只出现于MySQL,MsSql和Oracle不会出现此问题。

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  • 原文地址:https://www.cnblogs.com/chuanqi1995/p/11589481.html
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