Question

Hi I have a table in my database for product discount which looks something like this:

id  product quantity NewPrice

On my website in php at the moment:

for each row:
Price per unit when buying $quanity or more: $NewPrice

But what I would like is:

Price per unit when buying $quanity1-$quanity2: $NewPrice1
Price per unit when buying $quanity2-$quanity3: $NewPrice2
Price per unit when buying $quanity3 or more: $NewPrice3

So basically I would like to take the quanity-value from two different rows to make up the text for the price from the first row.

If that makes sense?

Answer 1

Order the results by product, quantity and then loop over the results and compare with the previous row:

$lastRow = null;
$sql = "SELECT * FROM prices ORDER BY product, quantity";
$result = mysql_query($sql);
while ($row = mysql_fetch_array($result)) {
    if ($lastRow and $lastRow['product'] == $row['product']) {
        echo "Price per unit when buying ".$lastRow['quantity']." - ".($row['quantity']-1).": ".$lastRow['price']."\n<br>";
    } elseif ($lastRow) {
        echo "Price per unit when buying ".$lastRow['quantity']." or more: ".$lastRow['price']."\n<br>";
    }
    $lastRow = $row;
}
if ($lastRow) {
    echo "Price per unit when buying ".$lastRow['quantity']." or more: ".$lastRow['price']."\n<br>";
}