更新后显示此触发器（错误1093：1093：您无法在FROM子句中指定目标表'uim'进行更新）

Question

当我尝试更新表中的值并进行更新后，触发器会自动触发，因为出现错误ERROR 1093：1093：您无法指定目标表'uim'，因此我无法进行更新在FROM子句中进行更新。

有人可以帮我吗？

UPDATE user_institution uim
            INNER JOIN
        user_master um ON uim.user_id = um.id 
    SET 
        uim.status = '1'
    WHERE
        uim.institution_id = NEW.id
            AND (um.country_id = NEW.country_id
            || um.country_id IN (SELECT 
                icm.country_id
            FROM
                institution_country_mapping icm
            WHERE
                icm.institution_id = NEW.id
                    AND icm.status = '1'))
            AND NOT EXISTS( SELECT 
                tb.user_id
            FROM
                (SELECT 
                    uim2.user_id
                FROM
                    user_institution uim2
                INNER JOIN institution_master im ON uim2.institution_id = im.id
                WHERE
                    uim2.user_id = um.id 
                        AND im.is_default = '2'
                        AND uim2.status = '1'
                        AND im.status = '1') AS tb);