Sql – use (Group by) with 2 columns

I have table named (TB1) with columns (Device – Order_id – qty) ….

I want write sql query to show each (order No) with (device name) with (total device qty) in this order … I know we must use (group by) … But I don’t know how do that

>Solution :

You can group by two columns like this : group by col1, col2.
So your query should be something like:

select Device, Order_no, sum(Qty)
from table_name
group by Device, Order_no