Optimize SQL Query with GROUP BY - mysql

Question

I need help with a query running slow when using group by:
SELECT `customers`.`id`
,`customers`.`firstname`
,`customers`.`lastname`
,`customers`.`address`
,`customers`.`address_co`
,`customers`.`country`
,`customers`.`zipcode`
,`customers`.`city`
,`customers`.`phone`
,`customers`.`mobilephone`
,`customers`.`ssn`
,`users`.`email`
,`customer_lists`.`name` AS `customerList`
,COUNT( transactions.id ) AS transactions_count
,SUM( transactions.sum_incl ) AS sum_incl
,SUM( transactions.sum_excl ) AS sum_excl
,`customers`.`created_at`
FROM `customers`
INNER JOIN `users`
ON `customers`.`user_id` = `users`.`id`
LEFT JOIN `transactions`
ON `customers`.`id` = `transactions`.`customer_id`
INNER JOIN `customer_lists`
ON `customers`.`customer_list_id` = `customer_lists`.`id`
WHERE `customer_lists`.`club_id` = '1'
GROUP BY `customers`.`id`
ORDER BY `customers`.`created_at` DESC
When I run a EXPLAIN it says Using temporary; Using filesort.
**id** **select_type** **table** **type** **possible_keys** **key** **key_len** **ref** **rows** **Extra**
1 SIMPLE customer_lists ref PRIMARY,club_id_index club_id_index 8 const 1 Using temporary; Using filesort
1 SIMPLE customers ref customers_user_id_foreign,customers_customer_list_... customers_customer_list_id_index 8 kund_workbox_nu.customer_lists.id 867
1 SIMPLE users eq_ref PRIMARY PRIMARY 8 kund_workbox_nu.customers.user_id 1
1 SIMPLE transactions ref customer_id_index customer_id_index 8 kund_workbox_nu.customers.id 3108
How do I fix that?
UPDATE
Tables:
Customers
CREATE TABLE `customers` (
`id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
`user_id` bigint(20) unsigned NOT NULL,
`customer_list_id` bigint(20) unsigned NOT NULL,
`firstname` varchar(100) COLLATE utf8_unicode_ci NOT NULL,
`lastname` varchar(100) COLLATE utf8_unicode_ci NOT NULL,
`address` varchar(100) COLLATE utf8_unicode_ci NOT NULL,
`address_co` varchar(100) COLLATE utf8_unicode_ci NOT NULL,
`country` varchar(100) COLLATE utf8_unicode_ci NOT NULL,
`zipcode` varchar(10) COLLATE utf8_unicode_ci NOT NULL,
`city` varchar(100) COLLATE utf8_unicode_ci NOT NULL,
`phone` varchar(20) COLLATE utf8_unicode_ci NOT NULL,
`mobilephone` varchar(20) COLLATE utf8_unicode_ci NOT NULL,
`ssn` varchar(15) COLLATE utf8_unicode_ci NOT NULL,
`last_login` datetime NOT NULL,
`added_information` tinyint(1) NOT NULL DEFAULT '0',
`created_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
`updated_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
PRIMARY KEY (`id`),
KEY `customers_user_id_foreign` (`user_id`),
KEY `customers_customer_list_id_index` (`customer_list_id`),
CONSTRAINT `customers_customer_list_id_foreign` FOREIGN KEY (`customer_list_id`) REFERENCES `customer_lists` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
CONSTRAINT `customers_user_id_foreign` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=29739 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
Transactions
CREATE TABLE `transactions` (
`id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
`transaction_type_id` bigint(20) unsigned NOT NULL,
`customer_id` bigint(20) unsigned NOT NULL,
`created_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
`updated_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
`sum_incl` decimal(15,4) NOT NULL,
`sum_excl` decimal(15,4) NOT NULL,
PRIMARY KEY (`id`),
KEY `transactions_customer_id_foreign` (`customer_id`),
KEY `transactions_transaction_type_id_foreign` (`transaction_type_id`),
CONSTRAINT `transactions_customer_id_foreign` FOREIGN KEY (`customer_id`) REFERENCES `customers` (`id`) ON DELETE CASCADE ON UPDATE CASCADE,
CONSTRAINT `transactions_transaction_type_id_foreign` FOREIGN KEY (`transaction_type_id`) REFERENCES `transaction_types` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=580116 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
Customer Lists
CREATE TABLE `customer_lists` (
`id` bigint(20) unsigned NOT NULL AUTO_INCREMENT,
`club_id` bigint(20) unsigned NOT NULL,
`name` varchar(90) COLLATE utf8_unicode_ci NOT NULL,
`created_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
`updated_at` timestamp NOT NULL DEFAULT '0000-00-00 00:00:00',
PRIMARY KEY (`id`),
KEY `customer_lists_club_id_foreign` (`club_id`),
CONSTRAINT `customer_lists_club_id_foreign` FOREIGN KEY (`club_id`) REFERENCES `clubs` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=11 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

Answer 1

Perhaps try a single table grouping on transactions as a derived table?
SELECT
`customers`.`id`
, `customers`.`firstname`
, `customers`.`lastname`
, `customers`.`address`
, `customers`.`address_co`
, `customers`.`country`
, `customers`.`zipcode`
, `customers`.`city`
, `customers`.`phone`
, `customers`.`mobilephone`
, `customers`.`ssn`
, `users`.`email`
, `customer_lists`.`name` AS `customerList`
, `trans`.transactions_count
, `trans`.sum_incl
, `trans`.sum_excl
, `customers`.`created_at`
FROM `customers`
INNER JOIN `users` ON `customers`.`user_id` = `users`.`id`
INNER JOIN `customer_lists` ON `customers`.`customer_list_id` = `customer_lists`.`id`
LEFT JOIN (
SELECT
`transactions`.`customer_id`
, COUNT(transactions.id) AS transactions_count
, SUM(transactions.sum_incl) AS sum_incl
, SUM(transactions.sum_excl) AS sum_excl
FROM `transactions`
GROUP BY `transactions`.`customer_id`
) `trans` ON `customers`.`id` = `trans`.`customer_id`
WHERE `customer_lists`.`club_id` = '1'
ORDER BY `customers`.`created_at` DESC
A where clause in that subquery may also help.

Answer 2

Have you tried to create indexes on all the JOIN columns, i.e. customers.user_id, users.id, transactions.customer_id, ... ?