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    <p>Your question isn't the best, I'll try to help but better questions get better answers.</p> <p>I'll assume you need to keep the tables 3 separate tables (I personally wouldn't, I'd just add a <code>distributor</code> field or similar and put everything in one table).</p> <p>(Judging by your PHP tag, I'll put it in php).<br> I'll provide a rather specific example, but it is important that you understand how it works so you can adapt it.</p> <pre><code>//Dist. A $query = "SELECT * FROM `db`.`table_a` WHERE 1 ORDER BY `sku` DESC"; //Get the list of products $result = mysql_query ($query) or die (mysql_error()); while ( $row = mysql_fetch_assoc($result)) { if ( $row['stock'] != 0 ) { //If we have stock... $query = "SELECT * FROM `final_table` WHERE `sku` LIKE '".$row['sku']."'"; //See if we have the data in the final table $final_result = mysql_query ($query) or die (mysql_error()); if ( mysql_num_rows($final_result) == 0 ) { //Product Not in new table $query = "INSERT INTO `final_table` VALUES ( '".$row['sku']."' [The rest of your values]"; mysql_query ($query) or die (mysql_error()); } if ( mysql_num_rows($final_result) &gt;= 1 ) { //Product In new table $new_row = mysql_fetch_assoc($new_result); //Get the data into an array so we can compare the prices if ( $row['price'] &lt; $final_row['price'] ) { //New price is lower $query = "UPDATE `final_table` SET `dist` = 'A', `price` = '".$row['price']."' [Other Vars that need update] WHERE `sku` LIKE '"$row['sku']"'"; mysql_query ($query) or die (mysql_error()); } } } } </code></pre> <p>Then repeat it for B and C tables, updating the table names and the value that's put in the final db.</p> <p>(I realize I probably violated some conventions in that example, but the concept is there.)</p> <p>This does assume a few things, mainly that <code>sku</code> is some sort of unique index.</p>
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    1. POCompare 3 tables and create new table with lowest price
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