选择过去7天内上传的数据

I want to select data from my table that was uploaded in the last 7 days. Here is what i have so far but it is not working.

$sql9="SELECT SUM(TruckDamage) 
WHERE DATEDIFF(`upload_date`, CURRENT_DATE) < 7 
AS     TotalTruckDamageSum FROM jwtdriversbank2";  
$result9=mysql_query($sql9);
$rows9=mysql_fetch_assoc($result9);
$sum8=$rows9['TotalTruckDamageSum'];
?>
<div>
Total Truck Repair Cost's: &pound;<?echo $sum8?><br>

Can anybody help please?

The problem is that your query is invalid. You are assigning TotalTruckDamageSum to WHERE. Second syntax error is that FROM should be before WHERE. And last but not least is that bigger date should be first if you want to get non-negative result of DATEDIFF.

Should be:

$sql9="SELECT SUM(TruckDamage) AS TotalTruckDamageSum FROM `jwtdriversbank2` WHERE DATEDIFF(CURRENT_DATE,`upload_date`) <= 7";

should be

sql9="SELECT SUM(TruckDamage) 

AS     TotalTruckDamageSum FROM jwtdriversbank2 WHERE DATEDIFF(`upload_date`, CURRENT_DATE()) < 7";  

$sql9="SELECT SUM(TruckDamage) AS     TotalTruckDamageSum 
                  where upload_date >= DATE_SUB(now(), INTERVAL 7 DAY)
                  FROM jwtdriversbank2";  

$result9=mysql_query($sql9);
$rows9=mysql_fetch_assoc($result9);
$sum8=$rows9['TotalTruckDamageSum'];
?>
<div>
Total Truck Repair Cost's: &pound;<?echo $sum8?><br>