获取DISTINCT行的函数

Question

There are lots of articles on getting distinct rows through a sql statement but I havent found the help I need after a SQL statement has already run. Im very new to PHP and I am using the DHTMLX library to render a grid. The unusual syntax used to render the grid is throwing me off big time. What I want is simply distinct rows in my grid only. Everything works great, I just need help getting a function together that will return distinct rows. In my code below I managed to get the two functions that are commented out to work great so I have been using them as a roadmap but I just can't pull the "distinct function" together due to a lack of familiarity with loops. Can someone help me with the syntax needed to have this function return distinct rows. I think array_unique will come into play but Im pretty lost at this point.

<?php
require("codebase/grid_connector.php");
$res = mysql_connect("localhost", "1newuser", "");
mysql_select_db("supplydb");



function distinct($result)
{
    $grab = array_unique($rows->get_value("group"));

}



/*function formatting($row){
$data = $row->get_value("gpo_item");
if ($data == 1)
$row->set_value("gpo_item",Yes);
else
$row->set_value("gpo_item",No);
}    */
/*function calck($action){
$data1 = $action->get_value("list_price");
$data2 = $action->get_value("sugg_price");
$sum = (($action->get_value("sugg_price") / $action->get_value("list_price")) - 1) * 100 ;
$sum2 = round($sum);
$sum3 = abs($sum2);        
$action->set_value("discount",$sum3);
}    */
$gridConn = new GridConnector($res, "MySQL");
//$gridConn->event->attach("beforeRender","formatting");
//$gridConn->event->attach("beforeRender","calck");
$gridConn->event->attach("beforeRender", "distinct");
$gridConn->render_sql("SELECT * FROM manufacturers JOIN submissions on manufacturers.manufacturer_id=submissions.manufacturer_id JOIN products on products.product_id=submissions.product_id JOIN product_group on submissions.category=product_group.id", "submission_id", "date,man_name,group,requesting_clinician, requesting_clinician_email, contract_number");
?> 

Answer 1

All array_unique does is eradicates duplicate values within a given array.

Why can you not just specify a distinct lookup within your sql?