I am querying a database of hour entries and summing up by company and by week. I understand that MySQL's week function is based on a calendar week. That being said, I'm getting some unexpected grouping results. Perhaps you sharp-eyed folks can lend a hand:
SELECT * FROM (
SELECT
tms.date,
SUM( IF( tms.skf_group = "HP Group", tms.hours, 0000.00 )) as HPHours,
SUM( IF( tms.skf_group = "SKF Canada", tms.hours, 000.00 )) as SKFHours
FROM time_management_system tms
WHERE date >= "2012-01-01"
AND date <= "2012-05-11"
AND tms.skf_group IN ( "HP Group", "SKF Canada" )
GROUP BY WEEK( tms.date, 7 )
# ORDER BY tms.date DESC
# LIMIT 7
) AS T1
ORDER BY date ASC
My results are as follows: (Occasionally we don't have entries on a Sunday for example. Do null values matter?)
('date'=>'2012-01-01','HPHours'=>'0.00','SKFHours'=>'2.50'),
('date'=>'2012-01-02','HPHours'=>'97.00','SKFHours'=>'78.75'),
('date'=>'2012-01-09','HPHours'=>'86.50','SKFHours'=>'100.00'),
('date'=>'2012-01-16','HPHours'=>'68.00','SKFHours'=>'96.25'),
('date'=>'2012-01-24','HPHours'=>'39.00','SKFHours'=>'99.50'),
('date'=>'2012-02-05','HPHours'=>'3.00','SKFHours'=>'93.00'),
('date'=>'2012-02-06','HPHours'=>'12.00','SKFHours'=>'122.50'),
('date'=>'2012-02-13','HPHours'=>'64.75','SKFHours'=>'117.50'),
('date'=>'2012-02-21','HPHours'=>'64.50','SKFHours'=>'93.00'),
('date'=>'2012-03-02','HPHours'=>'45.50','SKFHours'=>'143.25'),
('date'=>'2012-03-05','HPHours'=>'62.00','SKFHours'=>'136.75'),
('date'=>'2012-03-12','HPHours'=>'54.25','SKFHours'=>'133.00'),
('date'=>'2012-03-19','HPHours'=>'77.75','SKFHours'=>'130.75'),
('date'=>'2012-03-26','HPHours'=>'61.00','SKFHours'=>'147.00'),
('date'=>'2012-04-02','HPHours'=>'86.75','SKFHours'=>'96.75'),
('date'=>'2012-04-09','HPHours'=>'84.25','SKFHours'=>'120.50'),
('date'=>'2012-04-16','HPHours'=>'90.00','SKFHours'=>'127.25'),
('date'=>'2012-04-23','HPHours'=>'103.25','SKFHours'=>'89.50'),
('date'=>'2012-05-02','HPHours'=>'72.50','SKFHours'=>'143.75'),
('date'=>'2012-05-07','HPHours'=>'68.25','SKFHours'=>'119.00')
January 2nd is the first Monday, hence Jan 1st is only one day. I would expect the output to be consecutive Mondays (Monday Jan 2, 9, 16, 23, 30, etc)? The unexpected week groupings below continue throughout the results. Any ideas?
Thanks very much!