如何减少视图的执行时间？

Question

Here is my query:

select count(1) AS `number`,
       `pronexo_pronexo`.`unique_products`.`product_id` AS `product_id`,
       `pronexo_pronexo`.`products`.`name` AS `name`
from ( `pronexo_pronexo`.`unique_products`
join `pronexo_pronexo`.`products` 
on((`pronexo_pronexo`.`unique_products`.`product_id` = `pronexo_pronexo`.`products`.`id`)))
where isnull(`pronexo_pronexo`.`unique_products`.`exit_time`)
group by `pronexo_pronexo`.`unique_products`.`product_id`

And here is the result of EXPLAIN :

Any idea should I create an index on which column(s) to make it faster? It takes about 3 sec to be executed now. By the way the data isn't huge by now.

Answer 1

select  count(1) AS `number`,
        u.`product_id`,
        p.`name`
    from  `pronexo_pronexo`.`unique_products` AS u
    join  `pronexo_pronexo`.`products` AS p
      on  u.`product_id` =  p.`id`
     where  isnull(u.`exit_time`)
    group by  u.`product_id`

Change isnull(u.exit_time) to u.exit_time IS NULL .

Add INDEX(exit_time, product_id) to unique_products .

In products , if id is not indexed, index it.

For further discussion, please provide SHOW CREATE TABLE .