1、mysql查询报错： ORDER BY clause is not in GROUP BY..this is incompatible with sql_mode=only_full_group_by
解决方法：
执行如下2条sql：
set global sql_mode='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';
set session sql_mode='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION';
2、mysql查询报错：Illegal mix of collations (utf8_general_ci,IMPLICIT) and (utf8_unicode_ci,IMPLICIT) for operation '='
解决方法：
执行如下2条sql：
ALTER TABLE databaseName.tableName DEFAULT COLLATE utf8_unicode_ci;
ALTER TABLE databaseName.tableName CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci
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