Solved

MySQL - normalize table

Posted on 2011-09-10
2
343 Views
Last Modified: 2012-05-12
How can I take current table and normalize it so that it has one keyword_tag per user_id?

Thanks in advance for your feedback.


CREATE TABLE IF NOT EXISTS `keywords_tags` (
  `user_id` int(11) default NULL,
  `updated` int(1) default '0',
  `keyword_tags` text,
  KEY `user_id` (`user_id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;

--
-- Dumping data for table `keywords_tags`
--

INSERT INTO `keywords_tags` (`user_id`, `updated`, keyword_tags`) VALUES
(10, 0, '2087'),
(11, 1, '2003 2006 2018 2099'),
(12, 1, '2102 2030'),
(13, 1, '2087 2085 2089 2099 2100 2444'),
(14, 0, NULL);
0
Comment
Question by:sabecs
2 Comments
 
LVL 59

Accepted Solution

by:
Kevin Cross earned 500 total points
ID: 36518188
sabecs,

This may not have the best performance in the world, but it is a method that can be used especially if this is a one time thing to fix design issue and then you will be inserting into the normalized table moving forward.

First, grab my util.numbers table script, unless you already have a numbers utility table -- in which case, substitute util.numbers for your table name.

Code to parse keyword_tags:
SELECT user_id, updated
     , SUBSTRING(`keyword_tags`, n, LOCATE(' ', CONCAT(`keyword_tags`, ' '), n)-n) `keyword_tag`
FROM `keywords_tags`
JOIN util.numbers 
   ON SUBSTRING(CONCAT(' ', `keyword_tags`), n, 2) REGEXP '^ [0-9]$'

Open in new window


Hope that helps!
0
 

Author Closing Comment

by:sabecs
ID: 36518305
Thanks mwvisa1.
0

Featured Post

Efficient way to get backups off site to Azure

This user guide provides instructions on how to deploy and configure both a StoneFly Scale Out NAS Enterprise Cloud Drive virtual machine and Veeam Cloud Connect in the Microsoft Azure Cloud.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

As a database administrator, you may need to audit your table(s) to determine whether the data types are optimal for your real-world data needs.  This Article is intended to be a resource for such a task. Preface The other day, I was involved …
Both Easy and Powerful How easy is PHP? http://lmgtfy.com?q=how+easy+is+php  Very easy.  It has been described as "a programming language even my grandmother can use." How powerful is PHP?  http://en.wikipedia.org/wiki/PHP  Very powerful.  But a…
Microsoft Active Directory, the widely used IT infrastructure, is known for its high risk of credential theft. The best way to test your Active Directory’s vulnerabilities to pass-the-ticket, pass-the-hash, privilege escalation, and malware attacks …
Nobody understands Phishing better than an anti-spam company. That’s why we are providing Phishing Awareness Training to our customers. According to a report by Verizon, only 3% of targeted users report malicious emails to management. With compan…

772 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question