Question

In my database, i got the following table with the following structure:

[taskdate_user]
id : int
user_id : int
taskdate_time : datetime

If i got, for example, 2 rows with the following data:

id : 1
user_id : 1
taskdate_time : 2013-01-25 10:15

id : 2
user_id : 1
taskdate_time : 2013-01-25 11:15

I need to filter out the earliest time for the user and taskdate_time combination. I got the following query right now :

// Get all the TaskdateUser objects for this week
$taskdateuser = TaskdateUser::where('taskdate_time', '>=', $this_monday)->where('taskdate_time', '<', $this_sunday)->order_by('taskdate_time', 'ASC')->get();

This will get me all TaskdateUser objects for the current week, but it does return all of them. Right now, i am ordering by taskdate_time and i’m doing that ascending. So i pick each first object for the user_id – taskdate_time combination.

This seems like a lot of extra code to filter out the first user_id – date combination. Does anybody has a suggestion to simplify this? Many thanks in advance!

EDIT 2 :

I need the earliest time, per user, per date.

I’ve edited my query in the following way :

    $taskdateuser = TaskdateUser::where('taskdate_time', '>=', $monday)
                                ->where('taskdate_time', '<', $sunday)
                                ->raw_where('id IN 
                                    (
                                        SELECT id
                                        FROM taskdate_user 
                                        GROUP BY date_format(taskdate_time, "%Y-%m-%d"), user_id
                                     )')
                                ->order_by('taskdate_time', 'ASC')
                                ->get();

If i echo all the taskdate_times, the output is as follows :

2013-01-21 14:14:00
2013-01-21 17:47:02
2013-01-25 10:56:00
2013-01-26 17:56:41

I have multiple taskdate_time’s on 2013-01-26 and 2013-01-25 which will show up only 1 time. And the 2013-01-21 always shows up 2 times. Why is this?

Answer 1

Get the latest date from grouped MySQL data

You will have to use RAW queries, but if I understand what you want, that should help you.

Something like:

$taskdateuser = DB::query(SELECT `id`,`user_id`,`taskdate_time` FROM `taskdate_user` WHERE `taskdate_time` IN (SELECT max(`taskdate_time`) FROM `taskdate_user`));