Comments on: Using a mysql update query to increment a field http://amystdesign.com/blog/mysql/update-query-increment-field Company Blog Mon, 26 Jul 2010 12:47:51 +0000 hourly 1 http://wordpress.org/?v=3.0 By: Garry http://amystdesign.com/blog/mysql/update-query-increment-field/comment-page-1#comment-8 Garry Sat, 21 Mar 2009 00:33:39 +0000 http://amystdesign.com/blog/?p=1#comment-8 Thanks Doug, the ORDER BY did it! Regarding Emily's question: In my case the integer field relates to previous employments in the user's CV. If the user changes job, then all previous jobs need the integer to increment. Current Job becomes Most Recent Job, Most Recent Job becomes Most Recent - 1, and so on. Thanks Doug, the ORDER BY did it!

Regarding Emily’s question: In my case the integer field relates to previous employments in the user’s CV. If the user changes job, then all previous jobs need the integer to increment. Current Job becomes Most Recent Job, Most Recent Job becomes Most Recent – 1, and so on.

]]> By: Doug Linsmeyer http://amystdesign.com/blog/mysql/update-query-increment-field/comment-page-1#comment-7 Doug Linsmeyer Fri, 20 Mar 2009 23:26:02 +0000 http://amystdesign.com/blog/?p=1#comment-7 It doesn’t have to be an auto-increment field to require a unique value (I think?). Just a primary key field, which are most often set to auto-increment for obvious reasons. It doesn’t have to be an auto-increment field to require a unique value (I think?). Just a primary key field, which are most often set to auto-increment for obvious reasons.

]]> By: Emily http://amystdesign.com/blog/mysql/update-query-increment-field/comment-page-1#comment-5 Emily Fri, 20 Mar 2009 21:12:14 +0000 http://amystdesign.com/blog/?p=1#comment-5 Why would you be incrementing a unique integer (auto-increment?) field? Why would you be incrementing a unique integer (auto-increment?) field?

]]> By: Doug Linsmeyer http://amystdesign.com/blog/mysql/update-query-increment-field/comment-page-1#comment-4 Doug Linsmeyer Mon, 16 Mar 2009 14:27:30 +0000 http://amystdesign.com/blog/?p=1#comment-4 The a field in one of your rows must already have the id it is trying to increment to, You could try to get around it by doing your UPDATE query in reverse ORDER... try adding something like: ORDER BY id_field DESC that way it will be adding x to the highest number always and you should avoid cascading duplicates. The a field in one of your rows must already have the id it is trying to increment to, You could try to get around it by doing your UPDATE query in reverse ORDER… try adding something like:

ORDER BY id_field DESC that way it will be adding x to the highest number always and you should avoid cascading duplicates.

]]> By: Garry http://amystdesign.com/blog/mysql/update-query-increment-field/comment-page-1#comment-3 Garry Mon, 16 Mar 2009 14:12:06 +0000 http://amystdesign.com/blog/?p=1#comment-3 What can I do to make this work if the field is unique integer? As soon as the first one attempts to increment, I get a duplicate entry error. What can I do to make this work if the field is unique integer? As soon as the first one attempts to increment, I get a duplicate entry error.

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