I have seen a few post's regarding slow queries but none had the answer I'm hoping for.
I've been staring at this query for ages and for some reason cant see whats making this so damn slow dates such as 2022-01-01 > 2022-12-21 even taking 80 seconds....
So here is the query
SELECT
accounts.first_name,
accounts.last_name,
accounts.email,
(
SELECT
COUNT(ID)
FROM
customer_migration_details
WHERE
date_opened BETWEEN '2022-01-01' AND '2022-12-31' AND customer_migration_details.Assigned_to = accounts.email GROUP BY `accounts`.`email` LIMIT 1
) AS 'New Customers'
FROM
customer_migration_details
RIGHT JOIN accounts ON customer_migration_details.Assigned_to = accounts.email
WHERE
date_opened BETWEEN '2022-01-01' AND '2022-12-31' AND customer_migration_details.Assigned_to = accounts.email AND accounts.role LIKE '%Sales%'
GROUP BY
`accounts`.`email`
Heres the results
but here is the annoying part.
Showing rows 0 - 7 (8 total, Query took 109.5797 seconds.)
Theres got to be something im missing in the subquery maybe thats causing this to take so long.
1条答案
按热度按时间4nkexdtk1#
Use a
JOIN
withGROUP BY
or use a correlated sub-query, but not both at the same time.Or...
Notes:
It's bad practice to put spaces, etc, in column names, so I changed
New Customers
tonew_customers
.LIKE '%Sales%'
can't use an index, so will scan each and every account row.