optimize query with date type field in mysql

Question

I currently have the following query prepared:

select sum(amount) as total 
  from incomes 
 where (YEAR(date) = \'2019\' and MONTH(date) = \'07\') 
   and incom         


        

Answer 1

I would suggest writing the query as:

select sum(i.amount) as total
from incomes i
where i.date >= '2019-07-01' and
      i.date < '2019-08-01' and
      i.deleted_at is null;

This query can take advantage of an index on incomes(deleted_at, date, amount):

create index idx_incomes_deleted_at_date_amount on incomes(deleted_at, date, amount)