Column sum based on a single value of another column

Hi all

I've searched and searched, but just can't find if this is even possible, let alone how to do it.  What I'm trying to do, it's the sum of a column.  However, only summarize the results of this column if a specific value of another column is present.  So, for example, the following is a sample database entry:

Rate of pay hours

2.3                                  $14.00

1.2                                  $14.00

2.4                                  $12.50

0.75                                $12.50

So for that, I want the sum of hours worked column but only the sum of hours worked if the wage rate is $14.00 and $ 12.50.  Because these numbers are generated in a database (with the various people who enter multiple rates of pay), I won't be able to set the where statement to have a specific amount (since I don't know the specific amount each registrant), the amount must be a variable in the where the statement.  With MySQLI, I know not how to make the sum of hours worked, but I do not know how the sum of hours worked if and only if the line corresponds to the unique value in the rate column.

Then have it automatically loop through and total hours worked for other unique values in the column salary rate.  Finally, out all unique values in the column rate in variables so that I can do the following for each game:

$total1 = $total_hours1 * $wage_rate1
$total2 = $total_hours2 * $wage_rate2
$overall_total = $total1 + $total2

where $wage_rate1 = $14.00 and $total_hours1 = 2.3 + 1.2: etc.

Is it still possible?  If so, how?  If possible, can someone please let me know a good reference so I can learn how to be the best way to implement?

Thank you

So with that, I get the correct $final_total printed, but I still get the error, 'notice: Undefined variable: final_total. Why is it not defined, but prints the total exact? How to remove the error?

You get this notice is because you use the assignment combined, operator that is normally used to add a value to a variable and assign the new value to it.

$final_total += $total;

is a shortcut for this:

$final_total = $final_total + $total;

The undefined $final_total is on the right side of the assignment operator. The first time through the loop, you add $total to a non-existent value. Because of the type of PHP juggling, this becomes:

$final_total = 0 + $total;

The next time the loop runs, $final_total has a value, so that you get the view variable not defined only once.

To avoid advice, initialize $final_total to zero before the start of the loop.

$final_total = 0;

While ($row = {$sql-> fetch_array())}

Tags: Dreamweaver

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