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Retrieve rows based on month/year from mysql

Posted on 2012-04-10
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Last Modified: 2012-04-11
Hello,

I'm trying to construct a query to retrieve all the call costs incurred during a particular month passed from a post (post will look like: mydomain.com/script.php&timeperiod=2012-01 for instance) .

The timestamp for each call that has come in during the month is stored in the DB like: 2012-01-17 10:36:21

Not sure how to construct the 'WHERE' part to just look at the month/year and not the day or time?

Here is what I have currently.

$timeperiod = $_REQUEST['timeperiod];

$result = mysql_query("SELECT SUM(CallCost) FROM callers WHERE account_id = '$account_id' AND CallDate = '$timeperiod'");
            while ($row = mysql_fetch_assoc($result)) {
            $totalcost = $row['SUM(CallCost)'];
            $totalcost = sprintf("%01.2f", $totalcost);
      }

So with the above, I'd be trying to retrieve all the call costs that occurred in the month of January 2012 only and totalling them up.

Thanks as always,
TJ
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Question by:tjyoung
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4 Comments
 
LVL 6

Expert Comment

by:yawkey13
ID: 37830574
Your query will be:
SELECT SUM(CallCost) FROM callers WHERE account_id = '$account_id' AND MONTH(CallDate) = 'right($timeperiod,2)' AND YEAR(CallDate) = 'left($timeperiod,4)'

Here are the right and left functions:
function right($value, $count){
    return substr($value, ($count*-1));
}
 
function left($string, $count){
    return substr($string, 0, $count);
}

The query is solid, but check my PHP.  It is not my strong point.
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LVL 111

Accepted Solution

by:
Ray Paseur earned 2000 total points
ID: 37830675
Please read this article:
http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/A_201-Handling-date-and-time-in-PHP-and-MySQL.html

You can get the first day of a month with something like this:
URL: ...&timeperiod=2012-01
$alphaperiod = date('c', strtotime($_GET['timeperiod']  . '-01'));

And the last day of a month with something like this:
$omegaperiod = date('c', strtotime($_GET['timeperiod'] . '-t'));

Then you can use these values in the WHERE clause like this:
WHERE CallDate BETWEEN '$alphaperiod' AND '$omegaperiod'
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LVL 1

Author Closing Comment

by:tjyoung
ID: 37830741
Wish I read that couple months ago :)
Thanks.
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LVL 111

Expert Comment

by:Ray Paseur
ID: 37831868
Thanks for the points!  The way PHP functions date() and strtotime() play together is almost magical.
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