Join of 3 Tables - How to walk through results? - php

Question

I have this sql statement joining 3 tables:
SELECT * FROM `int_news`
LEFT JOIN tl_member ON int_news.member_id = tl_member.id
LEFT JOIN tl_news ON int_news.news_id = tl_news.id
The 3 Tables are like this:
Table 1 (int_news)
ID, member_id, news_id
Table 2 (tl_member)
id, firstname, lastname
Table 3 (tl_news)
id, headline
So far so good, but it seems i have a big blackhole in my head making me unable to solve how to output the result like this
For each "headline" i want ALL lastnames e.g.
headline 1 Jonny
Walker
Jim
headline 2 Knopf
Jon
Doe

Answer 1

It sounds your looking something like a pivot so if you group your query by headline, it will display each lastname as a column.
I found this good tutorial on pivots for mysql that might help you http://www.artfulsoftware.com/infotree/queries.php#78
headline 1 Jonny Walker Jim
headline 2 Knopf Jon Doe
Here is a loop that would do that *Forgive my php it's been a while.
$curHeadline = "";
while ( $db_field = mysql_fetch_assoc($result) ) {
if($curHeadline != $db_field['headline'])
{
$curHeadline = $db_field['headline'];
print $curHeadline . $db_field['ID']
}
print $db_field['lastName'] . "<BR>";
}

Answer 2

Try this for mysql :
SELECT tlnews.headline, GROUP_CONCAT(tl_member.last_name)
FROM `int_news` LEFT JOIN tl_member ON int_news.member_id = tl_member.id
LEFT JOIN tl_news ON int_news.news_id = tl_news.id
GROUP BY 1;
Expected Output:
headline1 Johnny,Walker,Jim
headline2 Knopf,Jon,Doe
...

Answer 3

Would something like this vaguely reflect your situation?
<?php
$sql = "
SELECT
`int_news`.`ID` AS `int_news_ID`,
`int_news`.`member_id`,
`int_news`.`news_id`,
`t1_member`.`id` AS `t1_member_id`,
`t1_member`.`firstname`,
`t1_member`.`lastname`, /* desired */
`t1_news`.`id` AS `t1_news_id`,
`t1_news`.`headline` /* desired */
FROM
`int_news`
LEFT JOIN `tl_member` ON `int_news`.`member_id` = `tl_member`.`id`
LEFT JOIN `tl_news` ON `int_news`.`news_id` = `tl_news`.`id`
";
$res = mysql_query($query);
$arrHeadings = array();
while($row = mysql_fetch_assoc($res)) {
// We want to output the results in groups of headings
$arrHeadings[$row['heading']][] = $row;
}
// Don't forget to cleanse for html output (unlike below)
// Loop through the headers
foreach($arrHeadings as $heading=>$arrRow) {
echo '<dl>';
echo '<dt>'.$heading.'</dt>';
echo '<dd>';
// Loop through rows with the same header
foreach($arrRow as $index=>$dbRow) {
echo $dbRow['lastname'].'<br />';
}
echo '</dd>';
echo '</dl>';
}
?>