How do I join same database name in MySQL? - mysql

Question

Basically I do while two time to get main group & group value. Example
$group_query = $db->query("
SELECT opt_id, opt_type
FROM ads_options
WHERE opt_id = '" . intval($data['ad_id']) . "'
GROUP BY opt_type");
while ($group_data = $db->fetch($group_query)) {
$option_query = $db->query("
SELECT *
FROM ads_options
WHERE opt_id = '" . intval($data['ad_id']) . "'
AND opt_type ='" . $group_data['opt_type'] . "'
ORDER BY opt_id DESC");
while ($option_data = $db->fetch($option_query)) {
}
}
Output :
Size : S
M
L
Color : White
Black
Question :
How to join current queries above with single statement?
Update :
Current database structure
opt_id opt_type opt_name opt_price
1236 Size S 0
1236 Size M 1
1236 Color Black 1
1236 Color White 2

Answer 1

Something like this would get the unique combinations, may be of help
$group_query = $db->query("
SELECT
DISTINCT opt_id, opt_type, opt_size
FROM ads_options
WHERE opt_id = " . intval($data['ad_id']) . "
ORDER BY opt_type, opt_size");
If you are able to supply more details as to precisely what you are trying to achieve, and the full design of ads_options, then it would be easier to provide more specific advice
Also a minor note, if opt_id is numeric then you don't need single quotes (') around it within the query (so removed them in example)
EDIT
Something like the following would return you a list of id, type, and then as third field a comma-delimited list of values, if that's of more help
$group_query = $db->query("
SELECT
opt_id, opt_type, GROUP_CONCAT(opt_name) AS opt_names
FROM ads_options
WHERE opt_id = " . intval($data['ad_id']) . "
ORDER BY opt_type");
For more information on GROUP_CONCAT check out this link http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html#function_group-concat
I've no idea if PHP programatically has something to help with this, I tend to use Coldfusion so if anyone knows of a PHP version of doing the following then that seems to match what OP was asking for
<cfoutput query="qryAdOptions" group="opt_type">
#qryAdOptions.opt_type#
<cfoutput>
#qryAdOptions.opt_name#
</cfoutput>
</cfoutput>
http://bytes.com/topic/php/answers/11929-grouping-results-query#post50606 seems to suggest the following as potentially a match for the I posted above so may be useful
$answer = array();
while ($row = pg_fetch_array($results)) {
if (!isset($answer[$row["obj_type"]])) {
$answer[$row["obj_type"]] = array();
}
$answer[$row["obj_type"]][] = $row;
}
You then iterate over $answer. This would play nicely with
SELECT * FROM ads_options WHERE opt_id = ......