MySQL: UPDATE with SUM and JOIN - mysql

Question

I'm trying to do a SUM and store it in another table. The SUM is simple :
SELECT award.alias_id,
SUM(award.points) AS points
FROM award
INNER JOIN achiever ON award.id = achiever.award_id
I now want to store that. I figured out how to do it on a row-by-row basis :
UPDATE aliaspoint
SET points = (SELECT SUM(award.points) AS points
FROM award
INNER JOIN achiever ON award.id = achiever.award_id
WHERE achiever.alias_id = 2000)
WHERE alias_id = 2000;
I thought something like this might work but I get:
ERROR 1111 (HY000): Invalid use of group function
UPDATE aliaspoint
INNER JOIN achiever ON aliaspoint.alias_id = achiever.alias_id
INNER JOIN award ON achiever.award_id = award.id
SET aliaspoint.points = SUM(award.points)
And some table definitions to help :
mysql> show create table aliaspoint;
| metaward_aliaspoint | CREATE TABLE `aliaspoint` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`alias_id` int(11) NOT NULL,
`points` double DEFAULT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `alias_id` (`alias_id`),
KEY `aliaspoint_points` (`points`)
) ENGINE=MyISAM AUTO_INCREMENT=932081 DEFAULT CHARSET=latin1 |
mysql> show create table achiever;
| metaward_achiever | CREATE TABLE `achiever` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`modified` datetime NOT NULL,
`created` datetime NOT NULL,
`award_id` int(11) NOT NULL,
`alias_id` int(11) NOT NULL,
`count` int(11) NOT NULL,
PRIMARY KEY (`id`),
KEY `achiever_award_id` (`award_id`),
KEY `achiever_alias_id` (`alias_id`)
) ENGINE=MyISAM AUTO_INCREMENT=87784996 DEFAULT CHARSET=utf8 |
mysql> show create table award;
| metaward_award | CREATE TABLE `award` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`points` double DEFAULT NULL,
PRIMARY KEY (`id`),
) ENGINE=MyISAM AUTO_INCREMENT=131398 DEFAULT CHARSET=utf8 |

Answer 1

You're missing the GROUP BY clause in:
SET points = (SELECT SUM(award.points) AS points
FROM award
INNER JOIN achiever ON award.id = achiever.award_id
WHERE achiever.alias_id = 2000)
There isn't enough information on the AWARD and ACHIEVER tables, so I recommend testing this before updating the UPDATE statement:
SELECT t.id, -- omit once confirmed data is correct
a.alias_id, -- omit once confirmed data is correct
SUM(t.points) AS points
FROM AWARD t
JOIN ACHIEVER a ON a.award_id = t.id
GROUP BY t.id, a.alias_id
Once you know the summing is correct, update the INSERT statement:
SET points = (SELECT SUM(t.points)
FROM AWARD t
JOIN ACHIEVER a ON a.award_id = t.id
WHERE a.alias_id = 2000 --don't include if you don't need it
GROUP BY t.id, a.alias_id)