MYsql5.7版本之后，用group by查询不在分组字段遇到的坑

Posted 2023-04-14

参考技术A select uid,name from (select uid,name from aa union select uid,name from bb) t group by uid order by uid desc LIMIT 10;

运行上面那个SQL会报错，因为5.7版本之后的mysql不在group by里的字段 跟在select会报错解决办法是，用函数 any_value(字段名)

select any_value(name),max(uid)from (select uid,name from aa union select uid,name from bb) t group by uid order by uid desc LIMIT 10;
运行上面的SQL 不报错了

mysql 8解决group by 不支持

mysql5.7及以后的版本 select查询字段未出现在group by 中是会报错的  需要在命令行中执行以下命令：

这只是单次生效，重启Mysql后会失效，如果要永久生效需要修改my.cnf

set @@global.sql_mode=‘STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION‘;

set @@session.sql_mode=‘STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_ENGINE_SUBSTITUTION‘;