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    <p>Your queries, reformatted:</p> <pre><code>$X: SELECT p.id FROM people_emails p WHERE p.internal_user_id = $_conf[user]-&gt;id; $Y: SELECT r.message_id , r.sender_email_id , r.receiver_email_id FROM email_routing r WHERE r.receiver_email_id = $X[id] AND r.type = $_REQUEST[type]; $R: SELECT e.subject , e.body , e.date FROM email e WHERE e.id = $Y[message_id]; $F: SELECT s.email FROM people_emails s WHERE s.id = $Y[sender_email_id] </code></pre> <p>To return these columns:</p> <pre><code>$F + $R[subject] + $R[body] + $R[date] </code></pre> <p>The queries can be combined like this:</p> <pre><code> SELECT s.email AS sender_email , e.subject , e.body , e.date FROM people_emails p JOIN email_routing r ON r.receiver_email_id = p.id AND r.type = $_REQUEST[type] JOIN email e ON e.id = r.message_id JOIN people_emails s ON s.id = r.sender_email_id WHERE p.internal_user_id = $_conf[user]-&gt;id; </code></pre> <hr> <h2>FOLLOWUP</h2> <p>To add the sender <code>full_name</code> from the <code>people</code> table, we can add a join to that table, and add the column to the SELECT list:</p> <pre><code>$N = SELECT n.full_name FROM people n WHERE n.id = (SELECT s.people_id FROM people_emails s WHERE s.email = :sender_email ) </code></pre> <p>We already have <code>:sender_email</code> from the query above, it's the value returned from <code>s.email</code> in the SELECT list, so we can just add a join to the <code>people</code> table: </p> <pre><code> SELECT s.email AS sender_email , n.full_name AS sender_full_name , e.subject , e.body , e.date FROM people_emails p JOIN email_routing r ON r.receiver_email_id = p.id AND r.type = $_REQUEST[type] JOIN email e ON e.id = r.message_id JOIN people_emails s ON s.id = r.sender_email_id JOIN people n ON n.id = s.people_id WHERE p.internal_user_id = $_conf[user]-&gt;id; </code></pre> <p>(I can't really test this, since I don't have your table definitions or sample data.)</p>
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    1. COThat's brilliant! Thank you, that worked exactly as I needed. I had a bit hard time to pass it to datatables then but I found a way to do this. At the end I suddently realized that I need one more column which is `full_name` of sender stored in **people** table and can be found by SELECT `full_name` FROM people WHERE id=(SELECT people_id FROM `people_emails` WHEERE `email`=sender_email); I have tried to add f.full_name right after SLECT in your example and then add "JOIN people f ON f.id = s.people_id" but I get full_name of myown (receiver name), no the sender_name.
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    2. COGreat! That's worked immediatly right. Thank you. I guess I have to learn this JOIN as I don't know how you do it but it gets the needed result.
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