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    <p>Try this:</p> <pre><code>SELECT * FROM ( SELECT t1.id_auction, t2.bidder_1 AS bidder, t2.item FROM table1 t1 INNER JOIN table1 t2 ON t1.id_auction = t2.id_auction AND t2.winner_1 = 1 UNION ALL SELECT t1.id_auction, t2.bidder_2 AS bidder, t2.item FROM table1 t1 INNER JOIN table1 t2 ON t1.id_auction = t2.id_auction AND t2.winner_2 = 1 ) AS sub ORDER BY id_auction; </code></pre> <h2><a href="http://www.sqlfiddle.com/#!2/1990e/3" rel="nofollow">SQL Fiddle Demo</a></h2> <p>This will give you:</p> <pre><code>| ID_AUCTION | BIDDER | ITEM | ------------------------------- | 1 | Alice | cup | | 1 | Ben | cup | | 2 | Alice | mug | | 3 | Charles | pen | | 3 | Ben | pen | </code></pre> <hr> <h2>Update 1</h2> <p>Just select a new column <code>bidder_number</code> with value 1 in the first query, and 2 in the second one like this:</p> <pre><code>SELECT * FROM ( SELECT t1.id_auction, t2.bidder_1 AS bidder, t2.item, 1 AS bidder_number -- &lt;---------- This is the new column FROM table1 t1 INNER JOIN table1 t2 ON t1.id_auction = t2.id_auction AND t2.winner_1 = 1 UNION ALL SELECT t1.id_auction, t2.bidder_2 AS bidder, t2.item, 2 -- &lt; --------- with value 2 for bidders 2 FROM table1 t1 INNER JOIN table1 t2 ON t1.id_auction = t2.id_auction AND t2.winner_2 = 1 ) AS sub ORDER BY id_auction, bidder; </code></pre> <p>This will give you:</p> <pre><code>| ID_AUCTION | BIDDER | ITEM | BIDDER_NUMBER | ----------------------------------------------- | 1 | Alice | cup | 1 | | 1 | Ben | cup | 2 | | 2 | Alice | mug | 2 | | 3 | Ben | pen | 1 | | 3 | Charles | pen | 2 | </code></pre> <h2><a href="http://www.sqlfiddle.com/#!2/1990e/8" rel="nofollow">SQL Fiddle Demo</a></h2>
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    1. COPerfect! Thank you!!!
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    2. CO@MugurUngureanu - You're welcome any time:)
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    3. CO@ Mahmoud Gamal - Can you help me again? I need to modify your query so I will know the number of the bidder. In your demo it will be another field with the value bidder_1 for Alice on ID_AUCTION 1, bidder_2 for Ben on ID_AUCTION 1 and so on. Sorry!
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