Question

I’ve got a database and I’d like to show some results from it without getting duplicates

Example

<?php

    $sql = "select * from my_table order by subcategory ASC";
    $result = mysql_query($sql) or die($qry);
    if (mysql_num_rows($result) == '0') {
        echo "No subcategory";
    } else {
        while ($line = mysql_fetch_array($result)) {
            echo $line[subcategory];
            echo "<br>";
        }
    }

?>

It currently shows me all subcategories even if they are duplicated
Question: How i can filter the results so that it will only show a subcategory once even if it’s in there 4 times.

Do I need to add something to this code to shows only without duplicated?

$sql ="select * from rss order by subcategory ASC";

Answer 1

Use GROUP BY

$sql = "select subcategory from rss group by subcategory"

See the manual for more information: http://dev.mysql.com/doc/refman/5.0/en/group-by-functions.html