mysql Syntax error or access violation: 1055 Expression #1 of SELECT list is not in GROUP BY clause

mysql使用group by 報錯:

Syntax error or access violation: 1055 Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'XXX.Y.ZZZZ' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

緣由：
      MySQL 5.7.5和up實現了對功能依賴的檢測。若是啓用了only_full_group_by SQL模式(在默認狀況下是這樣)，那麼MySQL就會拒絕選擇列表、條件或順序列表引用的查詢，這些查詢將引用組中未命名的非聚合列，而不是在功能上依賴於它們。(在5.7.5以前，MySQL沒有檢測到功能依賴項，only_full_group_by在默認狀況下是不啓用的。關於前5.7.5行爲的描述，請參閱MySQL 5.6參考手冊。)

執行如下個命令，能夠查看 sql_mode 的內容。

　　mysql> SHOW SESSION VARIABLES;

　　
　　mysql> SHOW GLOBAL VARIABLES;

　　mysql> select @@sql_mode;

可見session和global 的sql_mode的值都爲： 

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

only_full_group_by說明： 
only_full_group_by ：使用這個就是使用和oracle同樣的group 規則, select的列都要在group中,或者自己是聚合列(SUM,AVG,MAX,MIN) 才行，其實這個配置目前我的感受和distinct差很少的，因此去掉就好 
官網摘抄： 
官網：ONLY_FULL_GROUP_BY 
Reject queries for which the select list, HAVING condition, or ORDER BY list refer to nonaggregated columns that are neither named in the GROUP BY clause nor are functionally dependent on (uniquely determined by) GROUP BY columns.

As of MySQL 5.7.5, the default SQL mode includes ONLY_FULL_GROUP_BY. (Before 5.7.5, MySQL does not detect functional dependency and ONLY_FULL_GROUP_BY is not enabled by default. For a description of pre-5.7.5 behavior, see the MySQL 5.6 Reference Manual.)

A MySQL extension to standard SQL permits references in the HAVING clause to aliased expressions in the select list. Before MySQL 5.7.5, enabling ONLY_FULL_GROUP_BY disables this extension, thus requiring the HAVING clause to be written using unaliased expressions. As of MySQL 5.7.5, this restriction is lifted so that the HAVING clause can refer to aliases regardless of whether ONLY_FULL_GROUP_BY is enabled.

解決：
執行如下兩個命令：

mysql> 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';

mysql> 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';

這兩個命令，去掉 sql_mode 的 ONLY_FULL_GROUP_BY

見其餘文章有說： 
直接修改mysql配置文件（個人系統是Ubuntu16.04的，在/etc/mysql/mysql.conf.d/mysqld.cnf 中並無sql_mode這個配置，因此直接加上就好，若是是其餘系統有得修改就不用添加了） 
這個方法暫時沒有式。

mysql 配置信息讀取順序。

①ps aux|grep mysql|grep ‘my.cnf’

②mysql –help|grep ‘my.cnf’

/etc/my.cnf, /etc/mysql/my.cnf, /usr/local/etc/my.cnf, ~/.my.cnf這些就是mysql默認會搜尋my.cnf的目錄，順序排前的優先。mysql按照上面的順序加載配置文件，後面的配置項會覆蓋前面的。

若是沒有該文件能夠自定義一個文件。而後回默認讀取配置中的內容） 
查看你須要修改的是哪一個配置文件。我只有/etc/my.cnf 只修改這個文件便可

配置文件my.cnf一般會分紅好幾部分，如[client]，[mysqld], [mysql]等等。MySQL程序一般是讀取與它同名的分段部分，例如服務器mysqld一般讀取[mysqld]分段下的相關配置項。若是配置項位置不正確，該配置是不會生效的

參考：https://stackoverflow.com/questions/37951742/1055-expression-of-select-list-is-not-in-group-by-clause-and-contains-nonaggr

這個語句沒試過，先記錄：(標識:能用->重啓服務器以後,失敗)

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';

去掉ONLY_FULL_GROUP_BY便可正常執行sql.

經典經常使用方法(更改配置)

vim /etc/my.cnf

添加

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

 

 

# For advice on how to change settings please see
# http://dev.mysql.com/doc/refman/5.7/en/server-configuration-defaults.html

[mysqld]
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_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"

原文地址https://blog.csdn.net/qq_24038207/article/details/79358644