How Best to Maintain Sort Order Field

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I have created some PHP scripts that use MySQL to organize the photographs on my web site.

They are grouped into categories and the table for categories has these fields:

Category_id
Category_order
Category_name
Category_description

When creating a category, the category_id field is blank

I want to create another form to allow populating and/or changing this field and then updating the database.

I will select all category rows, dynamically build the form and update the database, of course.

But the next level of detail is not clear to me.

What should I make the form look like? Can I do it so that after the update order values will always go from 1 to n where n is the number of categories?

Thanks
Stephen

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