在mysql8.0及以上的版本中,数据库sql_mode默认设置了only_full_group_by
进入mysql
终端输入 : /usr/local/MySQL/bin/mysql -u root -p
然后输入密码进入mysql
输入:SELECT @@sql_mode;
可以看到如下显示结果:
mysql> SELECT @@sql_mode;
+-----------------------------------------------------------------------------------------------------------------------+
| @@sql_mode |
+-----------------------------------------------------------------------------------------------------------------------+
| ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION |
+-----------------------------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
通过以下脚本关闭 :
SET SESSION sql_mode=(SELECT REPLACE(@@sql_mode,'ONLY_FULL_GROUP_BY,',''));
再次查询 @@sql_mode 返回中应该已经没有该模式了。
mysql> SELECT @@sql_mode;
+----------------------------------------------------------------------------------------------------+
| @@sql_mode |
+----------------------------------------------------------------------------------------------------+
| STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION |
+----------------------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
选择对应数据库,同上执行下面两句,可以查看和配置sql_mode
SELECT @@sql_mode;
SET SESSION sql_mode=(SELECT REPLACE(@@sql_mode,'ONLY_FULL_GROUP_BY,',''));
mysql重启后失效,需要重新配置。
首先MAC下默认没有my.cnf配置文件,需要自己创建
首先进入etc 文件夹
cd /etc
然后通过 sudo vi my.cnf(一般需要管理权限执行,不然会报:"my.cnf" E212: Can't open file for writing)
创建并编写文件,然后按 i,进行编写
并将下述内容复制到文件中
# Example MySQL config file for small systems.
#
# This is for a system with little memory (<= 64M) where MySQL is only used
# from time to time and it's important that the mysqld daemon
# doesn't use much resources.
#
# MySQL programs look for option files in a set of
# locations which depend on the deployment platform.
# You can copy this option file to one of those
# locations. For information about these locations, see:
# http://dev.mysql.com/doc/mysql/en/option-files.html
#
# In this file, you can use all long options that a program supports.
# If you want to know which options a program supports, run the program
# with the "--help" option.
# The following options will be passed to all MySQL clients
[client]
default-character-set=utf8
#password = your_password
port = 3306
socket = /tmp/mysql.sock
# Here follows entries for some specific programs
# The MySQL server
[mysqld]
default-storage-engine=INNODB
character-set-server=utf8
collation-server=utf8_general_ci
port = 3306
socket = /tmp/mysql.sock
skip-external-locking
key_buffer_size = 16K
max_allowed_packet = 1M
table_open_cache = 4
sort_buffer_size = 64K
read_buffer_size = 256K
read_rnd_buffer_size = 256K
net_buffer_length = 2K
thread_stack = 128K
# Don't listen on a TCP/IP port at all. This can be a security enhancement,
# if all processes that need to connect to mysqld run on the same host.
# All interaction with mysqld must be made via Unix sockets or named pipes.
# Note that using this option without enabling named pipes on Windows
# (using the "enable-named-pipe" option) will render mysqld useless!
#
#skip-networking
server-id = 1
# Uncomment the following if you want to log updates
#log-bin=mysql-bin
# binary logging format - mixed recommended
#binlog_format=mixed
# Causes updates to non-transactional engines using statement format to be
# written directly to binary log. Before using this option make sure that
# there are no dependencies between transactional and non-transactional
# tables such as in the statement INSERT INTO t_myisam SELECT * FROM
# t_innodb; otherwise, slaves may diverge from the master.
#binlog_direct_non_transactional_updates=TRUE
# Uncomment the following if you are using InnoDB tables
#innodb_data_home_dir = /usr/local/mysql/data
#innodb_data_file_path = ibdata1:10M:autoextend
#innodb_log_group_home_dir = /usr/local/mysql/data
# You can set .._buffer_pool_size up to 50 - 80 %
# of RAM but beware of setting memory usage too high
#innodb_buffer_pool_size = 16M
#innodb_additional_mem_pool_size = 2M
# Set .._log_file_size to 25 % of buffer pool size
#innodb_log_file_size = 5M
#innodb_log_buffer_size = 8M
#innodb_flush_log_at_trx_commit = 1
#innodb_lock_wait_timeout = 50
[mysqldump]
quick
max_allowed_packet = 16M
[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates
[myisamchk]
key_buffer_size = 8M
sort_buffer_size = 8M
[mysqlhotcopy]
interactive-timeout
[mysqld]
sql_mode=STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION
使用:wq!命令保存退出文件
修改下my.cnf的文件权限
sudo chmod 664 /etc/my.cnf
最后重启Mysql,配置文件就可以生效了
可以通过 ANY_VALUE() 来改造查询语句以避免报错。
使用 ANY_VALUE() 包裹的值不会被检查,跳过该错误。所以这样是可以的:
如下所示
SELECT gender,
- last_name(改前)
+ ANY_VALUE(last_name) (改后)
FROM employees
GROUP BY gender
参考:
https://www.cnblogs.com/Wayou/p/mysql_group_by_issue.html
https://blog.csdn.net/weixin_38106322/article/details/105345643