Problème d'imbrication if pour ma requete

<?php
	if (isset($date_du) && isset($date_au)) 
	{
		
		$query_vg = mysql_query("SELECT IF(customers_from LIKE '1st%','1rst',customers_from) AS Origin, 
								   COUNT(*) AS effectif_vg
									FROM customers  inner join relances_gratuites on customers.customers_id=relances_gratuites.customers_id 
									WHERE customers_client='0' 
									AND customers_emv='0' 
									AND customers_seance ='0' 
									AND relances_gratuites_inscription_date>='" . $date_du . "' and  relances_gratuites_inscription_date<='" . $date_au . "'
									GROUP BY Origin "); 

	     $query = mysql_query("SELECT IF(cu.customers_from LIKE '1st%','1rst',cu.customers_from) AS Origin, 
							   COUNT(DISTINCT cu.customers_id) AS effectif, count(co.commandes_status) AS command,
							   AVG(co.commandes_montant) AS Mmc 
								FROM customers cu
								INNER JOIN commandes co 
								ON cu.customers_id=co.customers_id 
								INNER JOIN relances_gratuites rg 
								ON cu.customers_id=rg.customers_id  
								WHERE co.commandes_status='1' 
								AND rg.relances_gratuites_inscription_date>='" . $date_du . "' AND  rg.relances_gratuites_inscription_date<='" . $date_au . "'  
								GROUP BY Origin ";
								
		if (isset($date_du) && $date_du != '') 
		{
			$query_vg = mysql_query("SELECT IF(customers_from LIKE '1st%','1rst',customers_from) AS Origin, 
									   COUNT(*) AS effectif_vg
										FROM customers  inner join relances_gratuites on customers.customers_id=relances_gratuites.customers_id 
										WHERE customers_client='0' 
										AND customers_emv='0' 
										AND customers_seance ='0' 
										AND relances_gratuites_inscription_date>='" . $date_du . "' 
										GROUP BY Origin "); 
			$query = mysql_query("SELECT IF(cu.customers_from LIKE '1st%','1rst',cu.customers_from) AS Origin, 
								   COUNT(DISTINCT cu.customers_id) AS effectif, count(co.commandes_status) AS command,
								   AVG(co.commandes_montant) AS Mmc 
									FROM customers cu
									INNER JOIN commandes co 
									ON cu.customers_id=co.customers_id 
									INNER JOIN relances_gratuites rg 
									ON cu.customers_id=rg.customers_id  
									WHERE co.commandes_status='1' 
									AND rg.relances_gratuites_inscription_date>='" . $date_du . "'   
									GROUP BY Origin");
		}
		
		if(isset($date_au) && $date_au != '') 
		{
			$query_vg = mysql_query("SELECT IF(customers_from LIKE '1st%','1rst',customers_from) AS Origin, 
									   COUNT(*) AS effectif_vg
										FROM customers  inner join relances_gratuites on customers.customers_id=relances_gratuites.customers_id 
										WHERE customers_client='0' 
										AND customers_emv='0' 
										AND customers_seance ='0' 
										AND relances_gratuites_inscription_date>='" . $date_au . "' 
										GROUP BY Origin "); 
			$query = mysql_query("SELECT IF(cu.customers_from LIKE '1st%','1rst',cu.customers_from) AS Origin, 
								   COUNT(DISTINCT cu.customers_id) AS effectif, count(co.commandes_status) AS command,
								   AVG(co.commandes_montant) AS Mmc 
									FROM customers cu
									INNER JOIN commandes co 
									ON cu.customers_id=co.customers_id 
									INNER JOIN relances_gratuites rg 
									ON cu.customers_id=rg.customers_id  
									WHERE co.commandes_status='1' 
									AND rg.relances_gratuites_inscription_date>='" . $date_au . "'   
									GROUP BY Origin");
		}
	}
?>

 $condition = "";
   
      if (isset($date_du) && !empty($date_du)) {
            $condition .= " AND rg.relances_gratuites_inscription_date>='" . $date_du . "' ";
         }
   
      if (isset($date_au) && !empty($date_au)) {
             $condition .= " AND rg.relances_gratuites_inscription_date<='" . $date_au . "' ";
        }
   
      $query_vg = mysql_query("SELECT IF(customers_from LIKE '1st%','1rst',customers_from) AS Origin,
                              COUNT(*) AS effectif_vg
                               FROM customers c inner join relances_gratuites rg on c.customers_id=rg.customers_id
                               WHERE customers_client='0'
                               AND customers_emv='0'
                               AND customers_seance ='0'
                               " . $condition . "                        
                               GROUP BY Origin " );
 
    
      $query = mysql_query("SELECT IF(cu.customers_from LIKE '1st%','1rst',cu.customers_from) AS Origin,
                              COUNT(DISTINCT cu.customers_id) AS effectif, count(co.commandes_status) AS command,
                              AVG(co.commandes_montant) AS Mmc
                               FROM customers cu
                               INNER JOIN commandes co
                               ON cu.customers_id=co.customers_id
                               INNER JOIN relances_gratuites rg
                               ON cu.customers_id=rg.customers_id
                               WHERE co.commandes_status='1'
                               " . $condition . "
                              GROUP BY Origin " );