What's wrong with this inner query (MySQL)...
- by stuboo
...besides the fact that I am a total amateur?
My table is set up like this:
CREATE TABLE `messages` (
`id` int(6) unsigned NOT NULL AUTO_INCREMENT,
`patient_id` int(6) unsigned NOT NULL,
`message` varchar(255) NOT NULL,
`savedate` int(10) unsigned NOT NULL,
`senddate` int(10) unsigned NOT NULL,
`SmsSid` varchar(40) NOT NULL COMMENT 'where we store the cookies
from twilio',
`sendorder` tinyint(3) unsigned NOT NULL COMMENT 'the order we want
the msg sent in',
`sent` tinyint(1) NOT NULL COMMENT '0=queued, 1=sent,
2=sent-unqueued,4=rec-unread,5=recd-read',
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=143 ;
I need a query that will
SELECT * FROM `messages` WHERE `senddate` < $now AND `sent` = 0 (AND LIMIT
TO ONLY ONE RECORD PER `patient_id`)
I've tried the following:
SELECT *
FROM `messages`
WHERE `senddate` IN
(SELECT `patient_id`, max(`senddate`)
GROUP by `patient_id`)
AND `senddate` < $now AND `sent` = 0 ;
But I get this error:
MySQL client version: 5.1.37
`#1064 - You have an error in your SQL syntax; check the manual that
corresponds to your MySQL server
version for the right syntax to use
near 'GROUP by patient_id) AND
senddate < 1270093898 AND sent = 0
LIMIT 0, 30' at line 5
