1. 错误：select list expression not prduced by aggregation ouput(missing from GROUP BY caluse?)

		1. 原因：查询时查询结果的别名与group by字句中的列名冲突，如：

```	sql
select
	sum(dd) as b
from
	a
group by
	b,
	c
```

		2. 解决方法：将查询结果中的列别名进行修改即可；