在用mysql執行如下查詢的時候：

select * from `sys_user_group` group by `GROUP_ID`

報錯資訊如下：

[Err] 1055 - Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column 'information_schema.PROFILING.SEQ' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with
 
 sql_mode=only_full_group_by

錯誤的原因是我mysql版本是5.7的，使用如下語句查詢可知

select @@sql_mode;

裡面預設設定了

sql_mode=only_full_group_by

only_full_group_by ：使用這個就是使用和oracle一樣的group 規則, select的列都要在group中,或者本身是聚合列(SUM,AVG,MAX,MIN) 才行，其實這個配置目前個人感覺和distinct差不多的，所以去掉就好

直接修改mysql配置檔案（我的系統是Ubuntu16.04的，在/etc/mysql/mysql.conf.d/mysqld.cnf

[mysqld]下

sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

到此mysql配置檔案的完整配置如下：

[mysqld_safe]
socket          = /var/run/mysqld/mysqld.sock
nice            = 0

[mysqld]
#
# * Basic Settings
 

#
user            = mysql
pid-file        = /var/run/mysqld/mysqld.pid
socket          = /var/run/mysqld/mysqld.sock
port            = 3306
basedir         = /usr
datadir         = /var/lib/mysql
tmpdir          = /tmp
lc-messages-dir = /usr/share/mysql
skip-external-locking
lower_case_table_names=1
character-set-server=utf8
sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
#
# Instead of skip-networking the default is now to listen only on
# localhost which is more compatible and is not less secure.
#bind-address           = 127.0.0.1
#
# * Fine Tuning
#
key_buffer_size         = 16M
max_allowed_packet      = 16M
thread_stack            = 192K