Does “group by” automatically guarantee “order by”?

Question

Does \"group by\" clause automatically guarantee that the results will be ordered by that key? In other words, is it enough to write:

select * 
from table
group          


        

Answer 1

group by does not order the data neccessarily. A DB is designed to grab the data as fast as possible and only sort if necessary.

So add the order by if you need a guaranteed order.