Error Code: 1055.Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'userinfo.
环境:mysql-8.0.15-winx64
问题描述:
Error querying database. Cause: java.sql.SQLSyntaxErrorException: Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'tt.from_id' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
关于叶神的头条资讯网站项目,自己在练习时,写了一个站内信,却一直获取站内信列表失败。前后对照代码都没错,很是急人!然后用MySQL workbench图示化出来发现,在写以下SQL语句时就出现了错误。对照着IDEA上的出错警示(下图1所示)
SELECT * FROM message group by conversation_id;
图1. IDEA上的出错警示
果然是DAO层的SQL语句出现了问题。但是我回过头来看,再三检查,发现明明没有问题呢【黑人问号脸】,于是百度搜索,发现真有不少相关的问题。
原来代码没错,是数据库的sql_mode出了问题。
参照参考2中解释【真心详细】,SQL模式默认情况下是only_full_group_by ,MySQL就会拒绝选择列表、条件或顺序列表引用的查询,这些查询将引用组中未命名的非聚合列,而不是在功能上依赖于它们。
为了一探究竟,于是乎,先后照着执行以下命令:
SHOW SESSION VARIABLES;
SHOW GLOBAL VARIABLES;
select @@sql_mode;
可见:session和global 的sql_mode的值都为:
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
按照参考2中解决办法操作时,在命令行发现出现了问题
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';
发现提示sql_mode不能被赋值为NO_AUTO_CREATE_USER,操作了一下set session sql_mode,也是同样的问题。
于是乎,那不行就不行呗,将NO_AUTO_CREATE_USER删去了,再次赋值。果然成功!
正确执行命令是:
set global sql_mode='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION';
mysql> set session sql_mode='STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION';
这两个命令是去掉 sql_mode 的 ONLY_FULL_GROUP_BY模式的。故有效果。
另外,我还试了参考1中的办法,就是高赞的答案,执行如下:
SET GLOBAL sql_mode=(SELECT REPLACE(@@sql_mode,'ONLY_FULL_GROUP_BY',''));
然后发现也是不行,所以建议大家还是采用参考2中的方法吧!
参考:
2. 极力推荐:https://blog.csdn.net/fansili/article/details/78664267
3. http://blog.sina.com.cn/s/blog_3eba8f1c0102x75o.html
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