解决SELECT list is not in GROUP BY clause and contains nonaggregated column 'novle'

使用MySQL,创建视图,SQL语句如下

SELECT
    `n`.`id` AS `novelID`,
    `n`.`name` AS `novelName`,
    `n`.`info` AS `introduction`,
    group_concat(`t`.`name` SEPARATOR ',') AS `novelType`,
    `n`.`author` AS `author`,
    `e`.`attr` AS `attr`,
    `e`.`value` AS `value`,
    (
        CASE `n`.`isfinish`
        WHEN 0 THEN
            '连载中'
        ELSE
            '完结'
        END
    ) AS `isFinish`
FROM
    (
        (
            `novel` `n`
            LEFT JOIN `novel_expand` `e` ON ((`e`.`id` = `n`.`id`))
        )
        LEFT JOIN `tag` `t` ON ((`e`.`value` = `t`.`id`))
    )
GROUP BY
    `n`.`id`,
    `e`.`attr`
在运行时,出现下面错误
Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'novel.n.name' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

网上出现较多的解决办法: 
1.查询mysql 相关mode

select @@global.sql_mode;
可以看到模式中包含了ONLY_FULL_GROUP_BY,只要没有这个配置即可。 
我的Mysql版本是8.0.11,默认是带了ONLY_FULL_GROUP_BY模式。

 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.重设模式值

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.重启Mysql即可
但,我的按照这个流程试了很多遍,无法去掉“ONLY_FULL_GROUP_BY”,执行set方法会出现下面错误。

后来在网上看到一篇文章,是修改my.ini,后面跟着改,结果可行。具体方法如下:

1.在my.ini文件中添加下面一句

[mysqld]
sql_mode = STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION

2.重启mysql服务

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转载自blog.csdn.net/yyy2567338788/article/details/86573553