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utf8_col charset collation concat1 charset_concat1
ã utf8 utf8_bin ãñ utf8
Illegal mix of collations (utf8_bin,IMPLICIT) and (utf8mb4_0900_ai_ci,COERCIBLE) for operation 'concat'
utf8_col < _utf8mb4'ñ'
1
Illegal mix of collations (utf8_bin,IMPLICIT) and (utf8mb4_0900_ai_ci,COERCIBLE) for operation '<'