Mysql查詢不顯示列的總和

Question

任何想法爲什麼這不起作用？當我運行它時，它不顯示任何東西。

$qry = mysql_query(" SELECT SUM(payment_received) AS total FROM Orders "); 
    { 
$row = mysql_fetch_assoc($qry); 
echo $row['total']; 
} 

感謝您的任何幫助。

Answer 1

糾正你用下面的例子

$qry = mysql_query("SELECT SUM(payment_received) AS total FROM Orders"); 
while ($row = mysql_fetch_assoc($qry)) { 
{ 
    echo $row["total"]; 
} 

Answer 2

$result = mysql_query("SELECT SUM(payment_received) AS total FROM Orders") or die(mysql_error()); 
$row = mysql_fetch_assoc($result); 
print_r($row);