解决sql_mode=only_full_group_by的问题

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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