Illegal mix of collations (latin1_swedish_ci,IMPLICIT) and (utf8mb4_general_ci,COERCIBLE) for operation
在数据库执行查找的命令，判断条件含有特殊字符，再执行的时候报了以上错误；
查看字段编码发现是 latin1 字符集的latin1_german1_ci排序规则，而数据库是utf-8编码，确定错误是编码导致。
修改数据库字段为utf-8编码 再次执行 顺利查出结果
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