Illegal mix of collations (latin1_swedish_ci,IMPLICIT) and (utf8mb4_general_ci,COERCIBLE) for operation
在數據庫執行查找的命令，判斷條件含有特殊字符，再執行的時候報了以上錯誤；
查看字段編碼發現是 latin1 字符集的latin1_german1_ci排序規則，而數據庫是utf-8編碼，確定錯誤是編碼導致。
修改數據庫字段為utf-8編碼 再次執行 順利查出結果
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