I get this error: Error in query_privmsgs: Unknown column 'mt.key' in 'on clause'
The third table is "phpbb_users" and the only field I want to select out of that is "username"
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Question
SQL inner join question
I've got three tables that I want to join with one SQL statement. I got two of them working, but this won't order the responses by the DESC view. I need the following code to order the responses by the ID DESC and then to add a third table in the SQL statement as well (that's listed below my code). Any ideas?
$query_privmsgs = "SELECT DISTINCT phpbb_privmsgs.privmsgs_su
phpbb_privmsgs_text.privms
FROM phpbb_privmsgs LEFT OUTER JOIN phpbb_privmsgs_text
ON phpbb_privmsgs.privmsgs_id
$result_privmsgs = mysql_query($query_privmsg
query_privmsgs: " . mysql_error());
while ($row_privmsgs = mysql_fetch_array($result_
{
echo "<br><b>Subject</b> : " . $row_privmsgs['privmsgs_su
echo "<br><b>From:</b> " . $row_privmsgs['privmsgs_fr
echo "<br><b>To:</b> " . $row_privmsgs['privmsgs_to
echo "<br><b>Message</b> : " . $row_privmsgs['privmsgs_te
echo "<br>";
}
?>
The third table is phpbb_users and the field I want to add in there is called username (this essentially associates the ID's with an actual username).
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Answers
Here's my code that's producing the error:
$query_privmsgs = "SELECT DISTINCT m.privmsgs_subject, m.privmsgs_from_userid, m.privmsgs_to_userid, mt.privmsgs_text FROM phpbb_privmsgs m LEFT OUTER JOIN phpbb_privmsgs_text mt ON m.privmsgs_id = mt.privmsgs_text_id INNER JOIN phpbb_users t ON mt.key = t.key ORDER BY m.privmsgs_from_userid DESC"; // Get newest messages
Sorry, i didn't inform u to substitute the place-holders in that query.
Replace the u.user_id below with the key column of the users table.
Use this :
$query_privmsgs = "SELECT DISTINCT m.privmsgs_subject, m.privmsgs_from_userid, m.privmsgs_to_userid, mt.privmsgs_text FROM phpbb_privmsgs m LEFT OUTER JOIN phpbb_privmsgs_text mt ON m.privmsgs_id = mt.privmsgs_text_id INNER JOIN phpbb_users u ON u.user_id = m.privmsgs_from_userid ORDER BY m.privmsgs_from_userid DESC";
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by: jinesh_kamdarPosted on 2008-01-11 at 07:33:21ID: 20637169
>> I need the following code to order the responses by the ID DESC
To order by a field, it needs to be included in the SELECT list as well.
$query_privmsgs = "SELECT DISTINCT m.privmsgs_subject, m.privmsgs_from_userid, m.privmsgs_to_userid, mt.privmsgs_text FROM phpbb_privmsgs m LEFT OUTER JOIN phpbb_privmsgs_text mt ON m.privmsgs_id = mt.privmsgs_text_id INNER JOIN table_3 t ON mt.key = t.key ORDER BY m.privmsgs_from_userid DESC";