Find Difference between leader and Previous in results table

Question

Edited: (added table example)

With your help guys I\'m in this place that I have information in table ( Name, team, start time finish time and even time between these tw

Answer 1

you can work out the diff from leader by remembering the leaders time, and the previous time as you run through the loop.

lets add an elapsed_time into the query

SELECT 
 klass, nimi, synd, teamnimi, start, 
 TIME(`finish`) AS finish,
 timediff(time(finish), time(start)) AS aeg,
 finish - start as elapsed_time
FROM bc2014 T1 
INNER JOIN bc2014aeg T2 on T1.bc2014_id = T2.bc2014_id
WHERE klass = 'DS1 (1 koera toukerattavedu al.14 a.)'
ORDER BY aeg

Then use this in the result set to calculate the time differences

while($row = $results->fetch_array()) {
//.....

  if(isset($leader_time)){
    print ''. $row["elapsed_time"] - $leader_time .'s';
    print ''. $row["elapsed_time"] - $last_time .'s';
  } else { 
    print ' ';
    print ' ';
  }
// ...
  if(!isset($leader_time)){ $leader_time = $row["elapsed_time"] ;} 
  $last_time = $row["elapsed_time"] ;
}

you can then use $leader_time and $last_time to calculate the two difference columns