I want to optimize my sql query. Becasuse long response time - mysql

Question

First İ use wherehas but then I decided use this way. This way result better than wherehas but It isn't satisfy me. Query response time is a 873ms. So I have 400k+ data in the table.
select count(*) as aggregate
from `orders`
where (`pickup_address_id` in (
select `id`
from `addresses`
where `region_id` = 12)
or `delivery_address_id` in (
select `id`
from `addresses`
where `region_id` = 12)
) and `orders`.`status` = 2

Answer 1

Try this:
select count(distinct o.`id`) as aggregate
from `orders` o
inner join `addresses` a ON a.`id` IN (o.`pickup_address_id`, o.`delivery_address_id`)
AND a.`region_id` = 12
where o.`status` = 2
Alternatively:
SELECT count(distinct id) as aggregate
FROM (
select o.`id`
from `orders` o
inner join `addresses` a ON a.`id` = o.`pickup_address_id`
AND a.`region_id` = 12
where o.`status` = 2
UNION
select o.`id`
from `orders` o
inner join `addresses` a ON a.`id` = o.`delivery_address_id`
AND a.`region_id` = 12
where o.`status` = 2
) t
But I don't know you'll improve much to look through 400K rows in less than a second.

Answer 2

First, you can try to eliminate multiple (twice, to be more precise) same subquery evaluation using a Common Table Expression
WITH CTE(id) AS (
SELECT id
FROM addresses
WHERE region_id = 12
)
This CTE would be evaluated once.
Second, get row count from orders table joined with cte on existence of pickup_address_id and delivery_address_id in cte.
WITH CTE(id) AS (
SELECT id
FROM addresses
WHERE region_id = 12
)
SELECT COUNT (*)
FROM orders
CROSS JOIN CTE ON CTE.id = orders.delivery_address_id
OR CTE.id = orders.pickup_address_id
Finally, add filter by status = 2 and query would be like
WITH CTE(id) AS (
SELECT id
FROM addresses
WHERE region_id = 12
)
SELECT COUNT (*)
FROM orders
CROSS JOIN CTE ON CTE.id = orders.delivery_address_id
OR CTE.id = orders.pickup_address_id
WHERE orders.status = 2
Also you should have the following indexes:
addresses table:
INDEX (region_id)
orders table:
INDEX (pickup_address_id),
INDEX (delivery_address_id),
INDEX (status)
Give it a try.
With empty tables I've got this
Schema (MySQL v8.0)
create table addresses (
id int primary key,
region_id int not null,
index(region_id)
);
create table orders (
id int primary key,
pickup_address_id int,
delivery_address_id int,
status int not null,
index (pickup_address_id),
index (delivery_address_id),
index(status),
foreign key (pickup_address_id) references addresses(id),
foreign key (delivery_address_id) references addresses(id)
);
Query #1
explain with cte(id) as (
select id from addresses where region_id = 12)
select count(*) from orders
cross join cte on cte.id = orders.delivery_address_id
or cte.id = orders.pickup_address_id
where status = 2;
id
select_type
table
partitions
type
possible_keys
key
key_len
ref
rows
filtered
Extra
1
SIMPLE
orders
ref
pickup_address_id,delivery_address_id,status
status
4
const
1
100
1
SIMPLE
addresses
ref
PRIMARY,region_id
region_id
4
const
1
100
Using where; Using index