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Laravel Eloquent - distinct() and count() not working properly together

So I'm trying to get the number of distinct pids on a query, but the returned value is wrong.

This is what I try to do:

$ad->getcodes()->groupby('pid')->distinct()->count()

what returns the value "2", while the value it should return, should be "1".

As a workaround, I'm doing this:

count($ad->getcodes()->groupby('pid')->distinct()->get())

what works fine and returns "1"

Is there any rule where count and distinct cannot be on the same query? I find the workaround kind of "heavy", I would like to make the original query work :(

What you do you have in your sample table in database? And what do you want to achieve? Now you should probably get number of distinct values in pid column, so if you have in your table 2 records - one with pid 1, second with pid 2, count should return 2.
you can simply replace get with count in this way: $count = DB::table('tablename')->count(DB::raw('DISTINCT pid')); also can do: DB::table('tablename')->distinct('pid')->count('pid');

M
Mike Ross

The following should work

$ad->getcodes()->distinct()->count('pid');

Had a similar issue and it seems just leaving out the groupBy does the trick.
Distinct doesn't take any arguments. Calling distinct() when building your query just sets the protected boolean to true, the argument is ignored.
On L5.1 and this is still not working. Using count() seems to disable or drop the distinct(). Use groupBy() as described throughout the question. Edit: I'm finding even groupBy() is providing a different count() compared to get() followed by counting the resulting array.
@Jason I made the same observation as you. See my answer for a solution.
The distinct() function takes no arguments. You can change it to $ad->getcodes()->distinct()->count('pid'); with the same result.
A
Andrew

A more generic answer that would have saved me time, and hopefully others:

Does not work (returns count of all rows):

DB::table('users')
            ->select('first_name')
            ->distinct()
            ->count();

The fix:

DB::table('users')
            ->distinct()
            ->count('first_name');

A
Alexis Wilke

Anyone else come across this post, and not finding the other suggestions to work?

Depending on the specific query, a different approach may be needed. In my case, I needed either count the results of a GROUP BY, e.g.

SELECT COUNT(*) FROM (SELECT * FROM a GROUP BY b)

or use COUNT(DISTINCT b):

SELECT COUNT(DISTINCT b) FROM a

After some puzzling around, I realised there was no built-in Laravel function for either of these. So the simplest solution was to use use DB::raw with the count method.

$count = $builder->count(DB::raw('DISTINCT b'));

Remember, don't use groupBy before calling count. You can apply groupBy later, if you need it for getting rows.


Where did $builder come from?
@Andrew The Laravel query builder you are using for the query. For example, an Eloquent object $books = Book::where(...)->count(...)
->count(DB::raw('DISTINCT b')) generate the same SQL query as ->distinct()->count('b')
S
Shahrukh Anwar

You can use the following way to get the unique data as per your need as follows,

$data = $ad->getcodes()->get()->unique('email');

$count = $data->count();

Hope this will work.


this will pull records from db and then perform counting. That is not efficient. In the other hand, $ad->getcodes()->distinct('pid')->count('pid'); now we avoid having to actually select the records and instead can just count them which is more efficient
M
Matt McDonald

I had a similar problem, and found a way to work around it.

The problem is the way Laravel's query builder handles aggregates. It takes the first result returned and then returns the 'aggregate' value. This is usually fine, but when you combine count with groupBy you're returning a count per grouped item. So the first row's aggregate is just a count of the first group (so something low like 1 or 2 is likely).

So Laravel's count is out, but I combined the Laravel query builder with some raw SQL to get an accurate count of my grouped results.

For your example, I expect the following should work (and let you avoid the get):

$query = $ad->getcodes()->groupby('pid')->distinct();
$count = count(\DB::select($query->toSql(), $query->getBindings()));

If you want to make sure you're not wasting time selecting all the columns, you can avoid that when building your query:

 $query = $ad->select(DB::raw(1))->getcodes()->groupby('pid')->distinct();

B
Brett

I came across the same problem.

If you install laravel debug bar you can see the queries and often see the problem

$ad->getcodes()->groupby('pid')->distinct()->count()

change to

$ad->getcodes()->distinct()->select('pid')->count()

You need to set the values to return as distinct. If you don't set the select fields it will return all the columns in the database and all will be unique. So set the query to distinct and only select the columns that make up your 'distinct' value you might want to add more. ->select('pid','date') to get all the unique values for a user in a day


D
Daniel Santos
$solution = $query->distinct()
            ->groupBy
            (
                [
                    'array',
                    'of',
                    'columns',
                ]
            )
            ->addSelect(
                [
                    'columns',
                    'from',
                    'the',
                    'groupby',
                ]
            )
            ->get();

Remember the group by is optional,this should work in most cases when you want a count group by to exclude duplicated select values, the addSelect is a querybuilder instance method.


J
J Foley

Wouldn't this work?

$ad->getcodes()->distinct()->get(['pid'])->count();

See here for discussion..


This is not a good solution, because the get() call will execute the query and return the results from the database, and then the count() runs on the Collection.
j
jc_anchor

Based on Laravel docs for raw queries I was able to get count for a select field to work with this code in the product model.

public function scopeShowProductCount($query)
{
    $query->select(DB::raw('DISTINCT pid, COUNT(*) AS count_pid'))
          ->groupBy('pid')
          ->orderBy('count_pid', 'desc');
}

This facade worked to get the same result in the controller:

$products = DB::table('products')->select(DB::raw('DISTINCT pid, COUNT(*) AS count_pid'))->groupBy('pid')->orderBy('count_pid', 'desc')->get();

The resulting dump for both queries was as follows:

#attributes: array:2 [
  "pid" => "1271"
  "count_pid" => 19
],
#attributes: array:2 [
  "pid" => "1273"
  "count_pid" => 12
],
#attributes: array:2 [
  "pid" => "1275"
  "count_pid" => 7
]

K
Karl Anthony Baluyot

Distinct do not take arguments as it adds DISTINCT in your sql query, however, you MAY need to define the column name that you'd want to select distinct with. Thus, if you have Flight->select('project_id')->distinct()->get() is equialent to SELECT DISTINCT 'project_id' FROM flights and you may now add other modifiers like count() or even raw eloquent queries.


S
Sushant Yadav

This was working for me so Try This: $ad->getcodes()->distinct('pid')->count()


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x
xiaoxiao

try this

$ad->getcodes()->groupby('pid')->distinct()->count('pid')