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07.27.2008 at 10:05AM PDT, ID: 23599015
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7.8

Delete duplicate rows in table

Asked by bjv211 in SQL Query Syntax, MySQL Server

Tags:

I have a table 'ImageTags' with colums 'image_guid' & 'tag_ID'.  Each row should be unique to both elements (ie, there should not be 2 rows with the same image_guid and tag_ID.  Thomasian provided this query, which finds duplicate rows in my 'ImageTags' table.  I would like to implement a statement that would delete all but 1 of the duplicate rows.  How do I delete one of the duplicates so that I am left with only 1 unique row?Start Free Trial 
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SELECT I.*
FROM
  ImageTags I INNER JOIN
  (SELECT  image_guid, tag_id
     FROM ImageTags
     GROUP BY image_guid, tag_id
     HAVING COUNT(*)>1
  ) S ON I.image_guid=S.image_guid AND I.tag_id=S.tag_id
[+][-]07.27.2008 at 10:16AM PDT, ID: 22098985

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[+][-]07.27.2008 at 10:31AM PDT, ID: 22099043

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[+][-]07.27.2008 at 10:45AM PDT, ID: 22099085

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About this solution

Zones: SQL Query Syntax, MySQL Server
Tags: MySQL 5.0
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Solution Provided By: angelIII
Participating Experts: 2
Solution Grade: A
 
 
[+][-]07.28.2008 at 07:51AM PDT, ID: 22103711

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[+][-]08.01.2008 at 01:33PM PDT, ID: 22141739

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