SELECT list is not in GROUP BY clause and contains nonaggregated column
问题：
SELECT list is not in GROUP BY clause and contains nonaggregated column
原因：
举个例子，有这么一个查询语句：
SELECT
user_name as name,
user_age as age
FROM
user
GROUP BY
user_age
在MySQL5.7之后，sql_mode中ONLY_FULL_GROUP_BY模式默认设置为打开状态，这样的话，你select（查询）的字段都要包含在group by中，比如例子中，根据user_age进行分组，但是你查询的时候包含了user_name和user_age两个字段，而user_name不包含在group by当中，所以就会报错。
比如，表中的数据是这样的：
|
user_name |
user_age |
|
小明 |
23 |
|
小东 |
23 |
当你使用group by通过user_age进行分组，那么分组结果只有23，但是23中user_name有小明和小东，那么究竟是返回（小明，23）还是（小东，23）就存在歧义了
除非把语句中的user_name去掉，如下所示：
SELECT
user_age as age
FROM
user
GROUP BY
user_age
那么如果要查询user_name和user_age两个字段，并且根据user_age分组应该怎么解决呢？解决方法如下。
解决方法：
一种方法是通过临时或者修改配置文件的方式去掉ONLY_FULL_GROUP_BY 模式，这里就不讲了。这里讲另一种方法：通过使用any_value()函数来解决。
把原来的语句改写成如下形式：
SELECT
any_value(user_name) as name,
user_age as age
FROM
user
GROUP BY
user_age
如果有查询更多字段，形式如下：
SELECT
any_value(user_name) as name,
any_value(user_id) as id,
user_age as age
FROM
user
GROUP BY
user_age
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