Get most recent row with group by and Laravel

Question

Even though there are multiple questions like this I can't get my query to return the row with the most recent date with a group by.

I have the following table..

| message_id | from | to | created_at | status
----------------------------------------------
|    1       |   1  |  2 | 2017-04-06 |   1
|    2       |   1  |  2 | 2017-04-07 |   0
|    3       |   3  |  4 | 2017-04-06 |   1
|    4       |   3  |  4 | 2017-04-07 |   0
----------------------------------------------

and I'm tryin to get the rows with most recent date.

| message_id | from | to | created_at | status
----------------------------------------------
|    2       |   1  |  2 | 2017-04-07 |   0
|    4       |   3  |  4 | 2017-04-07 |   0

Currently this query returns the rows with the last recent date.

$messages = Message::where('to', Auth::id())
                    ->groupBy('from')
                    ->orderBy('created_at', 'DESC')
                    ->paginate(10);

score 9 · Accepted Answer · answered Apr 07 '17 at 16:07

9

The problem is that the result set will be first grouped then ordered. You can use nested select to get what you want.

SQL Query:

SELECT t.* FROM (SELECT * FROM messages ORDER BY created_at DESC) t GROUP BY t.from

With Laravel:

$messages = Message::select(DB::raw('t.*'))
            ->from(DB::raw('(SELECT * FROM messages ORDER BY created_at DESC) t'))
            ->groupBy('t.from')
            ->get();

You just need to add your where() clauses.

answered Apr 07 '17 at 16:07

Ivanka Todorova

9,533
15
56
97

This is the best answer after seeing all other answers in SO on similar questions. – Neel Jun 05 '18 at 19:51
@YubarajShrestha, are you getting any kind of errors or the result you're expecting is not correct? – Ivanka Todorova May 12 '20 at 09:05
3

Every time I use a group by it returns the oldest one, all I want is the latest. There's no error. – Yubaraj Shrestha May 12 '20 at 11:53
@YubarajShrestha can you post your query? – Ivanka Todorova May 12 '20 at 13:13
This solution is against the sql standard and will fail if only full group by sql mode is set, which has been the default setting for years! – Shadow May 24 '22 at 22:33

score 4 · Answer 2 · answered Jul 26 '18 at 07:57

4

You may replace groupBy with distinct, as it works in my case.

$messages = Message::where('to', Auth::id())
                ->orderBy('created_at', 'DESC')
                ->distinct('from')
                ->paginate(10);

Hope this helps.

answered Jul 26 '18 at 07:57

sllim.Sam

114
5

score 3 · Answer 3 · answered Oct 19 '21 at 19:38

3

If anyone is still looking for a short and Eloquent answer for using groupBy() with latest() just add unique() after get() like this...

$unreadMessages = Message::where('receiver_id', Auth::user()->id)
    ->where('read_at', null)
    ->latest()
    ->get()
    ->unique('user_id');

answered Oct 19 '21 at 19:38

Aushraful

59
6

2

Unique is a collection method and not a querybuilder method. This is highly inefficient. – Guido Rus Feb 04 '22 at 17:21

score 1 · Answer 4 · answered Aug 21 '20 at 21:20

1

To get most recent record for each from you can use a self join

DB::table('message as m')
  ->select('m.*')
  ->leftJoin('message as m1', function ($join) {
        $join->on('m.from', '=', 'm1.from')
             ->whereRaw(DB::raw('m.created_at < m1.created_at'));
   })
  ->whereNull('m1.from')
  ->orderBy('m.created_at', 'DESC')
  ->paginate(10);

In SQL it will look like

select m.*
from message m
left join message m1 on m.from = m1.from
and m.created_at < m1.created_at
where m1.from is null
order by m.created_at desc

Laravel Eloquent select all rows with max created_at

answered Aug 21 '20 at 21:20

M Khalid Junaid

62,293
9
87
115

1

this is the best answer for my similar question. – Daddi Al Amoudi Apr 27 '21 at 00:33
Query looks great. but when I tried to add where condition above leftJoin statement. it is not giving me any result. any help? – Maneesh Rao Jun 28 '21 at 09:13
@ManeeshRao Can you please ask a new question and elaborate your issue with relevant details, as in comments I cannot suggest without seeing the original code or condition, thanks – M Khalid Junaid Jun 28 '21 at 10:30

score 0 · Answer 5 · answered Feb 27 '19 at 11:41

You've got a date field in your example, not a datetime field, so the following is my preferred method:

# Mysql
select * from
  your_table
where date_field = (select max(date_field) from your_table)

// Laravel
YourModel:::query()->whereRaw('date_field = (select max(date_field) from your_table)')->get();

Note the above wont work as expected for datetime fields because the rows will have different timestamps, it'll likely just return the single latest row.

score -1 · Answer 6 · answered Apr 07 '17 at 16:01

You might also want to orderBy message_id as well

$messages = Message::where('to', Auth::id())
                    ->groupBy('from')
                    ->orderBy('created_at', 'DESC')
                    ->orderBy('message_id', 'DESC')
                    ->paginate(10);

Get most recent row with group by and Laravel

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