MySQL5.7版本sql_mode=only_full_group_by问题解决办法

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在服务器数据库查询使用了 GROUP BY 居然报出了

1055 - Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'csc_risk.a.DefaultDate' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by, Time: 0.035000s

于是把部分数据迁移到本地进行测试, 发现sql语句可以执行并查看数据库版本

原因分析：MySQL5.7版本默认设置了 mysql sql_mode = only_full_group_by 属性，导致报错。

下载安装的是最新版的mysql5.7.x版本，默认是开启了 only_full_group_by 模式的，但开启这个模式后，原先的 group by 语句就报错。

一旦开启 only_full_group_by ，只能获取受到其影响的字段信息，无法和其他未受其影响的字段共存，这样，group by 的功能将变得十分狭窄了

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为了验证是不是数据版本问题, 于是查询版本

SELECT VERSION()

查询数据版本发现确实是5.7版本

5.7.24

知道原因就好办, 查询怎么解决.

 

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1、查看sql_mode

SELECT @@sql_mode; 查询出来的值为：

ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

2、去掉ONLY_FULL_GROUP_BY，重新设置值。

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';

3、上面是改变了全局sql_mode，对于新建的数据库有效。对于已存在的数据库，则需要在对应的数据下执行：

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';

 

BUT,以上方式只是临时解决，数据库重启会失效

解决重启数据库失效问题

需修改mysql配置文件，通过手动添加sql_mode的方式强制指定不需要ONLY_FULL_GROUP_BY属性，

my.cnf位于etc文件夹下，添加如下：

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

重启mysql服务，顺利解决。

mac没有my.cnf需要自己创建，权限使用sudo，my.cnf参考如下

my.cnf

# Example MySQL config file for medium systems.    #    # This is for a system with little memory (32M - 64M) where MySQL plays    # an important part, or systems up to 128M where MySQL is used together with    # other programs (such as a web server)    #    # 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]  character-set-server=utf8  init_connect='SET NAMES utf8  port        = 3306    socket      = /tmp/mysql.sock    skip-external-locking    key_buffer_size = 16M    max_allowed_packet = 1M    table_open_cache = 64    sort_buffer_size = 512K    net_buffer_length = 8K    read_buffer_size = 256K    read_rnd_buffer_size = 512K    myisam_sort_buffer_size = 8M    character-set-server=utf8    init_connect='SET NAMES utf8'   sql_mode='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION'# 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  # (via the "enable-named-pipe" option) will render mysqld useless!  #   #skip-networking      # Replication Master Server (default)    # binary logging is required for replication    log-bin=mysql-bin          # binary logging format - mixed recommended      binlog_format=mixed              # required unique id between 1 and 2^32 - 1        # defaults to 1 if master-host is not set        # but will not function as a master if omitted        server-id   = 1              # Replication Slave (comment out master section to use this)      #      # To configure this host as a replication slave, you can choose between      # two methods :      #      # 1) Use the CHANGE MASTER TO command (fully described in our manual) -      #    the syntax is:      #      #    CHANGE MASTER TO MASTER_HOST=<host>, MASTER_PORT=<port>,      #    MASTER_USER=<user>, MASTER_PASSWORD=<password> ;      #      #    where you replace <host>, <user>, <password> by quoted strings and      #    <port> by the master's port number (3306 by default).      #      #    Example:      #      #    CHANGE MASTER TO MASTER_HOST='125.564.12.1', MASTER_PORT=3306,      #    MASTER_USER='joe', MASTER_PASSWORD='secret';      #      # OR      #      # 2) Set the variables below. However, in case you choose this method, then      #    start replication for the first time (even unsuccessfully, for example      #    if you mistyped the password in master-password and the slave fails to      #    connect), the slave will create a master.info file, and any later      #    change in this file to the variables' values below will be ignored and      #    overridden by the content of the master.info file, unless you shutdown      #    the slave server, delete master.info and restart the slaver server.      #    For that reason, you may want to leave the lines below untouched      #    (commented) and instead use CHANGE MASTER TO (see above)      #      # required unique id between 2 and 2^32 - 1      # (and different from the master)      # defaults to 2 if master-host is set      # but will not function as a slave if omitted      #server-id       = 2      #      # The replication master for this slave - required      #master-host     =   <hostname>      #      # The username the slave will use for authentication when connecting      # to the master - required      #master-user     =   <username>      #      # The password the slave will authenticate with when connecting to      # the master - required      #master-password =   <password>      #      # The port the master is listening on.      # optional - defaults to 3306      #master-port     =  <port>      #      # binary logging - not required for slaves, but recommended      #log-bin=mysql-bin              # 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            default-character-set=utf8                       [myisamchk]          key_buffer_size = 20M          sort_buffer_size = 20M          read_buffer = 2M          write_buffer = 2M                      [mysqlhotcopy]            interactive-timeout

 

/   总结   /

 

mysql5.7版本其实跟5.6版本区别还是挺大的，有时间咱们再仔细讲讲。

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