Question

I have a table with email addresses (colums: id, email, user, date). I’m trying to sum email addresses by date then user, which I’m able to do with the below code; but then also sum the total for all users and display it below that date. I’m not sure how to do that… do I need to do another query to total for each date?

$sql = mysql_query("SELECT date, COUNT(email), user FROM emails GROUP BY DATE(date), user");
while ($row = mysql_fetch_array($sql)){
  echo date('m/d', strtotime($row['date'])) . " " . $row['user'] . " " . $row['COUNT(email)'] . "<br />";
}

What I have:

date user count(email)
09/09 29 8
09/09 49 9
09/10 29 4
09/10 49 13
09/11 29 1
09/11 49 3

What I would like:

date user count(email)
09/09 29 8
09/09 49 9
09/09 total 17

09/10 29 5
09/10 49 13
09/10 total 18

09/11 29 1
09/11 49 3
09/11 total 4

Thanks

EDIT: Here’s my code that works:

$sql = mysql_query("SELECT date, COUNT(email), user FROM emails GROUP BY DATE(date), user WITH ROLLUP");

while ($row = mysql_fetch_array($sql)){
  echo date('m/d', strtotime($row['date'])) . " " . (!isset($row['user']) ? 'total' : $row['user']) . " " . $row['COUNT(email)'] . "<br />";
}

Answer 1

See WITH ROLLUP (a GROUP BY modifier).

SELECT DATE(`date`) AS date
     , user 
     , COUNT(email) AS cnt
FROM emails 
GROUP BY DATE(`date`)
       , user 
WITH ROLLUP 

would give you:

date    user   cnt
09/09   29       8
09/09   49       9
09/09   NULL    17

09/10   29       5
09/10   49      13
09/10   NULL    18 

09/11   29       1
09/11   49       3
09/11   NULL     4

NULL    NULL    39