mysql group by avg_mysql~group by

`GROUP BY` is a MySQL clause that is used to group the result set based on one or more columns. The `AVG()` function is an aggregate function in MySQL that is used to calculate the average value of a set of values.

To use `GROUP BY` and `AVG()` together in MySQL, you can do something like this:

SELECT column1, AVG(column2)
FROM table_name
GROUP BY column1;

This will group the result set by values in `column1` and then calculate the average value of `column2` for each group.

For example, if you have a table called `sales` with columns `region` and `sales_amount`, you could use the following query to get the average sales amount for each region:

SELECT region, AVG(sales_amount)
FROM sales
GROUP BY region;