Question

I need to either have a masive select statement or multiple queries. I need to break down data into specific timeframes during the day. This one works great for the first interval, but after that I’m stumped. If I have multiple queries, I’m having trouble with my “mysql_fetch_array”, as to the syntax (using something like ‘else’ and going through them).

SELECT U.user_name,ROUND(SUM((TA.task_average*TC.completed)/60),2) AS equiv1, S.submit_date,
    SUM(TC.completed) AS ttasks1,
    FROM `summary` S
    JOIN users U ON U.user_id = S.user_id
    JOIN tasks TA ON TA.task_id = S.task_id
    JOIN tcompleted TC ON TC.tcompleted_id = S.tcompleted_id
    JOIN minutes M ON M.minutes_id = S.minutes_id
    WHERE DATE(submit_date) = curdate( )
      AND TIME(submit_date) BETWEEN '06:00:00' and '07:59:59'       
      GROUP BY U.user_name
    LIMIT 0 , 30

My fetch array ( I would need to have a bunch more, but how to I combine them?)

<?php
while($rows=mysql_fetch_array($result1)){

?>

Answer 1

ok, given that you want the data across regular 2 hourly intervals, you could try something like this:

SELECT FLOOR(hour(S.submit_date)/2)*2, U.user_name,ROUND(SUM((TA.task_average*TC.completed)/60),2) AS equiv1, S.submit_date
    SUM(TC.completed) AS ttasks1,
    FROM `summary` S
    JOIN users U ON U.user_id = S.user_id
    JOIN tasks TA ON TA.task_id = S.task_id
    JOIN tcompleted TC ON TC.tcompleted_id = S.tcompleted_id
    JOIN minutes M ON M.minutes_id = S.minutes_id
    WHERE DATE(submit_date) = curdate( )
      GROUP BY U.user_name, FLOOR(hour(S.submit_date)/2)
    LIMIT 0 , 30

where FLOOR(hour(S.submit_date)/2)*2 will map each hour to the first (even) hour of every 2 and you can group by this value. ie.

0, 1 -> 0
2, 3 -> 2
4, 5 -> 4
etc...

---

update with php included:

some notes:

• i’ve used mysqli
• i’ve left joined the original query with an hours derived table to ensure there are no
  ‘gaps’ in the time intervals (assumed 6:00 – 20:00)
• i’ve ordered by user, so we as we loop through the results we can print table cells for a given user and then print a new table row when the user changes.

here’s the code:

echo '<table border=1><tr><td></td>';
for ($i=6; $i<=18; $i=$i+2) {
    echo '<td colspan=2>'.$i.' - '.($i+2).'</td>';
}

$mysqli = new mysqli('MY_HOST', 'MY_USER', 'MY_PASSWORD', 'MY_DATABASE');

$sql = "
SELECT user_name, IFNULL(equiv1,0) AS equiv1, IFNULL(ttasks1,0) AS ttasks1, hour
FROM
(
    SELECT 6 AS hour
    UNION SELECT 8
    UNION SELECT 10
    UNION SELECT 12
    UNION SELECT 14
    UNION SELECT 16
    UNION SELECT 18
) hours LEFT JOIN

(
SELECT FLOOR(hour(S.submit_date)/2)*2 as task_hour, U.user_name, ROUND(SUM((TA.task_average*TC.completed)/60),2) AS equiv1, S.submit_date
    SUM(TC.completed) AS ttasks1
    FROM `summary` S
    JOIN users U ON U.user_id = S.user_id
    JOIN tasks TA ON TA.task_id = S.task_id
    JOIN tcompleted TC ON TC.tcompleted_id = S.tcompleted_id
    JOIN minutes M ON M.minutes_id = S.minutes_id
    WHERE DATE(submit_date) = curdate( )
      GROUP BY U.user_name, FLOOR(hour(S.submit_date)/2)
    LIMIT 0 , 30
) task_summary
ON hours.hour = task_summary.task_hour
ORDER BY user_name, hour
";

$result = $mysqli->query($sql);

$user_name = '';
while ($row = $result->fetch_assoc()) {
    if ($user_name <> $row['user_name']){
        echo '</tr><tr><td>'.$row['user_name'].'</td>'; //start a new row if user changes
        $user_name = $row['user_name']; //update user variable for checking on next iteration
    }
    echo '<td>'.$row['equiv1'].'</td>';
    echo '<td>'.$row['ttasks1'].'</td>';
}

echo '</tr><table>';