Group by 2 columns

Hello, 

I need help.

I've a table "saisie" and a table "places". 

In the table "places", I've a column that contain a count of records of table "saisie". 

This result give me the same value on each row and it's normal. 

Now I need to group this result by 2 columns of the table "places". 

How to do a group by 2 columns? 

Thanks for your help 

Regards