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character set - Trying to support unicode in MySQL database - Database Administrators Stack Exchange
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utf8mb4 - How to change value of character_set_results variable to utfmb4 in MySQL 8.0? - Stack Overflow
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By shardingsphere querying character_set_client sometimes for utf8mb4 and sometimes for latin1, our underlying MySQL table encoding is utf8mb4 · Issue #13563 · apache/shardingsphere · GitHub
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