MYSQL: Weekly , Monthly and Yearly Report - mysql

Question

i want to make report that can be viewed by weekly , monthly and yearly.
for example:
i want to see who enrolled by weekly , or i want to see who enrolled in this month or year and also about the payments. i want to see the enrollee this june . i want to see the enrollee this 2010 by using a dropdown search.
// this is my code for my weekly report which i want to see students who enrolled last week but i dnt know if my code is correct.
$datetoday=date("Y-m-d");
$result = mysql_query("
SELECT enrollee_info.*, payments.* from enrollee_info
INNER JOIN payments on payments.enrollee_id=enrollee_info.e_id
WHERE enrollee_info.category='Walk In'
AND DATE_FORMAT(payments.entrydate , %Y-%m-d')>=SUBDATE('".$datetoday."' , INTERVAL 7 DAY)");
with monthly and yearly , for example i want to see who enrolled this month etc. and i want to see who enrolled this year by using a dropdown that you can select month or the year you want to search.

Answer 1

Take a look at the manual regarding the acceptable units for INTERVAL. You can simply use a switch to determine the range for your records.
In your drop down you'll have week, month or year. You can then use a switch to prepare your statement.
$sql = "SELECT enrollee_info.*,
payments.*
FROM enrollee_info
INNER JOIN payments
ON payments.enrollee_id = enrollee_info.e_id
WHERE enrollee_info.category = 'Walk In'
AND payments.entrydate >= Subdate(Curdate(), ";
switch ($range) {
case "month":
$sql .= 'INTERVAL 1 MONTH';
break;
case "year":
$sql .= 'INTERVAL 1 YEAR';
break;
//if no match, use week
default:
$sql .= 'INTERVAL 1 WEEK';
}
$sql .= ')';
Which would create a statement like this:
SELECT enrollee_info.*,
payments.*
FROM enrollee_info
INNER JOIN payments
ON payments.enrollee_id = enrollee_info.e_id
WHERE enrollee_info.category = 'Walk In'
AND payments.entrydate >= Subdate(Curdate(), INTERVAL 1 week)
If possible, try to avoid fetching all columns from each table and use a column list.