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MySQL - update table from 2 other tables.

Posted on 2016-08-22
2
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Last Modified: 2016-08-22
Hi,
Can anyone provide an SQL query to get the distinct `title` from the`locations` table where locations.id = staff_locations.location_id and insert into `locations_2` table?

I hope that makes sense

Thanks in advance.

 CREATE TABLE IF NOT EXISTS `staff_locations` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `staff_id` int(10) unsigned NOT NULL,
  `location_id` int(10) unsigned NOT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `unique_ids_idx` (`staff_id`,`location_id`),
  KEY `location_id` (`location_id`)
) ENGINE=InnoDB  DEFAULT CHARSET=utf8 AUTO_INCREMENT=6 ;



INSERT INTO `staff_locations` (`id`, `staff_id`, `location_id`) VALUES
(1, 1, 200),
(2, 1, 202),
(3, 1, 211),
(4, 2, 211),
(5, 1, 224),
(6, 2, 229);



CREATE TABLE IF NOT EXISTS `locations` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `title` varchar(255) DEFAULT '',
  `position` int(11) NOT NULL DEFAULT '9999',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB  DEFAULT CHARSET=utf8 AUTO_INCREMENT=231 ;



INSERT INTO `locations` (`id`, `title`, `position`) VALUES
(200, '2209', 9999),
(201, '2210', 9999),
(202, '2211', 9999),
(203, '2212', 9999),
(204, '2213', 9999),
(205, '2214', 9999),
(206, '2216', 9999),
(207, '2217', 9999),
(208, '2218', 9999),
(209, '2219', 9999),
(210, '2220', 9999),
(211, '2221', 9999),
(212, '2222', 9999),
(213, '2223', 9999),
(214, '2224', 9999),
(215, '2225', 9999),
(216, '2226', 9999),
(217, '2227', 9999),
(218, '2228', 9999),
(219, '2229', 9999),
(220, '2230', 9999),
(221, '2231', 9999),
(222, '2232', 9999),
(223, '2233', 9999),
(224, '2234', 9999),
(225, '2250', 9999),
(226, '2251', 9999),
(227, '2256', 9999),
(228, '2257', 9999),
(229, '2258', 9999),
(230, '2259', 9999);



CREATE TABLE IF NOT EXISTS `locations_2` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `title` varchar(255) DEFAULT '',
  `position` int(11) NOT NULL DEFAULT '9999',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB  DEFAULT CHARSET=utf8 AUTO_INCREMENT=6 ;



INSERT INTO `locations_2` (`id`, `title`, `position`) VALUES
(1, '2209', 9999),
(2, '2211', 9999),
(3, '2221', 9999),
(4, '2234', 9999),
(5, '2258', 9999);

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Question by:sabecs
2 Comments
 
LVL 142

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 500 total points
ID: 41766375
I understand you need this
insert into locations_2` (`id`, `title`, `position`)
select l.id, l.title, l.position
from locations l
where exists(select null from staff_locations sl
                where sl.location_id = l.id 
  )

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Author Comment

by:sabecs
ID: 41766386
Thanks guy, that is perfect
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