Inner Join Query in Laravel Eloquent

Now, let's see tutorial of how to apply inner join in laravel. you'll learn how to make inner join in laravel. i explained simply about how to write inner join in laravel. you can understand a concept of laravel inner join query builder. you will do the following things for inner join query in laravel eloquent.

If you are new in laravel and you don't know how to write join in laravel application, then i will help you how to make inner join in laravel application. you can easily use inner join in laravel 6 and laravel 7 version.

Inner join is a main part of project. we almost require inner join everywhere in project because of related table.

In this example, i will create users table and countries table. i will add country_id on users table and add countries table id on users table. so when i get users at that time we will get country name from country_id using inner join.

So, let's see bellow example:

Example:

users Table:

countries Table:

SQL Query:

select `users`.`id`, `users`.`name`, `users`.`email`, `countries`.`name` as `country_name` 
		from `users` 
		inner join `countries` on `countries`.`id` = `users`.`country_id`

Laravel Query:

<?php
  
namespace App\Http\Controllers;
  
use Illuminate\Http\Request;
use App\User;
  
class UserController extends Controller
{
    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index()
    {
        $users = User::select(
                            "users.id", 
                            "users.name",
                            "users.email", 
                            "countries.name as country_name"
                        )
                        ->join("countries", "countries.id", "=", "users.country_id")
                        ->get();
  
        dd($users);
    }
}

Output:

Array
(
    [0] => Array
        (
            [id] => 1
            [name] => Prof. Josiane Jast MD
            [email] => savanihd@gmail.com
            [country_name] => IN
        )
    [1] => Array
        (
            [id] => 2
            [name] => Mr. Donavon Beer
            [email] => yemmerich@example.net
            [country_name] => US
        )
    [2] => Array
        (
            [id] => 3
            [name] => Judy Watsica
            [email] => gutmann.christian@example.org
            [country_name] => CA
        )
)

Now i will give you best way to use inner join and get country name using Laravel Eloquent Relationship:

Example: Using Relationship

You have to create following models and controller method:

app/User.php

<?php
  
namespace App;
  
use Illuminate\Contracts\Auth\MustVerifyEmail;
use Illuminate\Foundation\Auth\User as Authenticatable;
use Illuminate\Notifications\Notifiable;
  
class User extends Authenticatable
{
    use Notifiable;
  
    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'name', 'email', 'password',
    ];
  
    /**
     * The attributes that should be hidden for arrays.
     *
     * @var array
     */
    protected $hidden = [
        'password', 'remember_token',
    ];
  
    /**
     * The attributes that should be cast to native types.
     *
     * @var array
     */
    protected $casts = [
        'email_verified_at' => 'datetime',
    ];
  
    /**
     * Get the comments for the blog post.
     */
    public function country()
    {
        return $this->belongsTo(Country::class);
    }
}

app/Country.php

<?php
  
namespace App;
  
use Illuminate\Database\Eloquent\Model;
  
class Country extends Model
{
        
}

Laravel Query:

<?php
  
namespace App\Http\Controllers;
  
use Illuminate\Http\Request;
use App\User;
   
class UserController extends Controller
{
    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index()
    {
        $users = User::select("*")
                        ->with('country')
                        ->take(3)
                        ->get();
  
        foreach ($users as $key => $value) {
            echo $value->id;
            echo $value->name;
            echo $value->country->name;
        }
        dd($users);
    }
}

I hope it can help you...