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MySQL - need to modify one table with contents from other table?

Posted on 2016-08-22
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Last Modified: 2016-08-22
Hi,
Can anyone provide an SQL query to get all distinct `location_id` from staff_locations table and add to locations_2 table as `title`.
Perhaps emptying the `locations_2` table might be the best option first?

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=21 ;



INSERT INTO `staff_locations` (`id`, `staff_id`, `location_id`) VALUES
(9, 1, 200),
(10, 1, 202),
(1, 1, 757),
(2, 1, 758),
(3, 1, 759),
(4, 1, 770),
(5, 1, 771),
(6, 1, 773),
(7, 1, 774),
(8, 1, 776),
(9, 1, 1641),
(10, 1, 1642),
(11, 2, 1636),
(12, 2, 1637),
(13, 2, 1638),
(14, 2, 1639),
(15, 2, 1641),
(16, 2, 1642),
(17, 2, 1645),
(18, 2, 1646),
(19, 2, 1647),
(20, 2, 1648);



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=203 ;



INSERT INTO `locations_2` (`id`, `title`, `position`) VALUES
(1, '200', 9999),
(2, '202', 9999);

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Question by:sabecs
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4 Comments
 
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Accepted Solution

by:
Ryan Chong earned 500 total points
ID: 41766261
try this:
insert into locations_2
(title)
select location_id
from staff_locations a left join locations_2 b
on a.location_id = b.title
where b.title is null;

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Expert Comment

by:Ryan Chong
ID: 41766263
>>Perhaps emptying the `locations_2` table might be the best option first?
it's depends... for the comment I posted above it will only inserting the new entries into table: locations_2
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Author Comment

by:sabecs
ID: 41766359
Thanks Ryan, your query works well expect I discovered I need the title from another table called locations, I will accept your solution and re post another question.
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Author Closing Comment

by:sabecs
ID: 41766361
Thanks
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