MySQL 报 Epression #1 of SELECT list is not in GROUP BY clause and contains nonaggre的问题

 

MySQL 报 Epression #1 of SELECT list is not in GROUP BY clause and contains nonaggre的问题
执行 SQL 后，报如下错误：

1 queries executed, 0 success, 1 errors, 0 warnings

Query: select id from message group by conversation_id LIMIT 0, 1000

Error Code: 1055
Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'toutiao.message.id' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

Execution Time : 0 sec
Transfer Time  : 0 sec
Total Time     : 0 sec

问题出现的原因：

MySQL 5.7.5及以上功能依赖检测功能。如果启用了ONLY_FULL_GROUP_BY SQL模式（默认情况下），MySQL将拒绝选择列表，HAVING条件或ORDER BY列表的查询引用在GROUP BY子句中既未命名的非集合列，也不在功能上依赖于它们。

5.7.5之前，MySQL没有检测到功能依赖关系，默认情况下不启用ONLY_FULL_GROUP_BY。有关5.7.5之前的行为的说明，请参见“MySQL 5.6参考手册”。

解决步骤

1. 打开 ·mysql.cnf`，在 [mysqld] 节点增加：

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

2. 保存，退出重启