错误原因：

​ sql _mode中only _full _group _by不兼容的问题

解决思路：

​ 既然是only _full _group _by不兼容，那就把它去掉就好啦

show variables like "sql_mode"; 

set sql_mode='';

set sql_mode='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';

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