Mysql Optimization suggestion for large table

Question

i want to optimize this query,

select  location_id, dept_id,
        round(sum(sales),0), sum(qty),
        count(distinct tran_id),
        now()
    from  tra         


        

Answer 1

For this query:

select location_id, dept_id,
       round(sum(sales), 0), sum(qty), count(distinct tran_id),
       now()
from tran_sales
where tran_date <= '2016-12-24'
group by location_id, dept_id;

There is not much you can do. One attempt would be a covering index: (tran_date, location_id, dept_id, sales, qty), but I don't think that will help much.