高版本SQL导入到低版本，引起1273错误
1、将SQL文件中的utf8mb4_0900_ai_ci替换为utf8_general_ci
2、utf8mb4替换为utf8
3、运行SQL文件，解决问题
SQL导入异常[ERR] 1273 - Unknown collation: 'utf8mb4_0900_ai_ci'
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MySql数据库导入sql错误 Unknown collation: 'utf8mb4_0900_ai_ci'
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