MYSQL错误：排序规则的非法混合

我收到以下错误消息

[Err]1267-非法混合排序规则（拉丁文、瑞典文、隐式） 和（utf8_general_ci，可强制）用于操作“=”

子查询包含来自两个不同数据库的两个表的并集。下面给出了我试图执行的查询

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这是由于排序规则的变化造成的。若在查询中显式给出任何值，则将从连接中获取排序规则

你可以用这样的东西

或

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请把这个答案格式化，我不能在我的机器里做

SELECT  c.CORRECTION_NO FROM    (
    SELECT  "regm2017" as `SESSION`,SERIALNO,NAME,FATHER
    FROM    regm2017.master r17
    WHERE   r17.IS_DELETED=0
    UNION
    SELECT  "regm2016" as `SESSION`,SERIALNO,NAME,FATHER
    FROM    regm2016.master r16
    WHERE   r16.IS_DELETED=0
    ) as r JOIN    corrections_registration as c ON      c.SERIALNO = r.SERIALNO
    AND c.`SESSION`= r.`SESSION`;

     SELECT c.CORRECTION_NO FROM (
     SELECT "regm2017" COLLATE utf8_general_ci as > `SESSION`,SERIALNO,NAME,FATHER
     FROM regm2017.master r17
     WHERE   r17.IS_DELETED=0
     UNION
     SELECT  "regm2016" COLLATE utf8_general_ci  as `SESSION`,SERIALNO,NAME,FATHER
     FROM    regm2016.master r16
     WHERE   r16.IS_DELETED=0
     ) as r JOIN    corrections_registration as c ON c.SERIALNO = 
     r.SERIALNO 
     AND c.`SESSION`= r.`SESSION`;`

  SELECT c.CORRECTION_NO FROM    (
  SELECT  "regm2017" COLLATE latin1_swedish_ci as `SESSION`,SERIALNO,NAME,FATHER
  FROM    regm2017.master r17
  WHERE   r17.IS_DELETED=0
  UNION
  SELECT  "regm2016" COLLATE latin1_swedish_ci as `SESSION`,SERIALNO,NAME,FATHER
  FROM    regm2016.master r16
  WHERE   r16.IS_DELETED=0
  ) as r JOIN    corrections_registration as c ON      c.SERIALNO = r.SERIALNO
  AND c.`SESSION`= r.`SESSION`;