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POUsing a sort order column in a database table
 

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    <p>Let's say I have a <code>Product</code> table in a shopping site's database to keep description, price, etc of store's products. What is the most efficient way to make my client able to re-order these products?</p> <p>I create an <code>Order</code> column (integer) to use for sorting records but that gives me some headaches regarding performance due to the primitive methods I use to change the order of every record after the one I actually need to change. An example:</p> <pre><code>Id Order 5 3 8 1 26 2 32 5 120 4 </code></pre> <p>Now what can I do to change the order of the record with <code>ID=26</code> to 3?</p> <p>What I did was creating a procedure which checks whether there is a record in the target order (3) and updates the order of the row (ID=26) if not. If there is a record in target order the procedure executes itself sending that row's ID with <code>target order + 1</code> as parameters.</p> <p>That causes to update every single record after the one I want to change to make room:</p> <pre><code>Id Order 5 4 8 1 26 3 32 6 120 5 </code></pre> <p>So what would a smarter person do?</p> <ul> <li>I use SQL Server 2008 R2.</li> </ul> <p><strong>Edit:</strong></p> <p>I need the order column of an item to be enough for sorting with no secondary keys involved. Order column alone must specify a unique place for its record.</p> <p>In addition to all, I wonder if I can implement something like of a linked list: A 'Next' column instead of an 'Order' column to keep the next items ID. But I have no idea how to write the query that retrieves the records with correct order. If anyone has an idea about this approach as well, please share.</p>
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    1. COA more experienced person wouldn't call a column `Order` since that's already a reserved keyword in SQL .... :-)
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