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Asked: 2026-05-18T23:28:11+00:00

I have a table that’s PK is an int field. My problem is I

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I have a table that’s PK is an int field.
My problem is I need to swap two of the values round.

This is my current code:

$newId = (int)$id; $newId = $newId - 1;

$result = mysql_query("UPDATE homeScroller SET id = '$newId' WHERE id = '$id'") or die('error '.mysql_error()); 
$result2 = mysql_query("UPDATE homeScroller SET id = '$id ' WHERE id = '$newId'") or die('error '.mysql_error());

The table contains at max 3 rows that contain info for an slideshow on the frontpage of the website. The frontpage orders them by their IDs. So to change the order I need to edit the ID’s.

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  1. Editorial Team

    The table contains at max 3 rows that contain info for an slideshow on the frontpage of the website. The frontpage orders them by their IDs. So to change the order I need to edit the ID’s.

    If that’s the case, then your application/database is poorly architect-ed, and you need to re-think your database design before you go any further.

    Primary keys should be immutable, i.e.: they should never change. What you’re talking about doing is changing primary keys.

    Fix your application/database, and you won’t have this problem. Are you sure you shouldn’t just be adding a new field ‘sort_order’ and ORDER BY sort_order instead or ordering by the ID field?

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