Laravel 8 Inner Join Query Example

In this tutorial we will learn about laravel 8 inner join query example. Also see how to join two tables in laravel 8. In laravel you can use group by query same as PHP. So, we will also see query of laravel inner join with group by. The query builder may also be used to add join clauses to your queries. To perform a basic “inner join”, you may use the join method on a query builder instance.

For laravel inner join query example we need the first argument passed to the join method is the name of the table you need to join to, while the remaining arguments specify the column constraints for the join. You may even join multiple tables in a single query and inner join query use in laravel 6, laravel 7, laravel 8.

So, let’s start example of inner join in laravel 8.

Laravel 8 Inner Join Query Example

SQL Query:

In this example, we will create users table and countries table. I will add country_id foriegn key on users table. So when I get users at that time we will get country name from country_id using inner join.

SELECT column_name(s)
FROM table1
INNER JOIN table2
ON table1.column_name = table2.column_name;

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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:

In this example select data like id, name email and country name but if you want all fileds then you can use * for select all data.

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();
}

Using DB:

use Illuminate\Support\Facades\DB;
$users = DB::table('users')
            ->join('contacts', 'users.id', '=', 'contacts.user_id')
            ->join('orders', 'users.id', '=', 'orders.user_id')
            ->select('users.*', 'contacts.phone', 'orders.price')
            ->get();

Subquery Joins with groupBy()

In this example, we will retrieve a collection of users where each user record also contains the created_at timestamp of the user's most recently published blog post.

$posts = DB::table('posts')
                   ->select('user_id', DB::raw('MAX(created_at) as last_post_created_at'))
                   ->where('is_published', true)
                   ->groupBy('user_id');

Read Also : Laravel 6 CRUD Tutorial with Example

Laravel Join() with 3 Tables

Now, I will give example about join 3 table in laravel and all tables are connected with each other.

$users = User::join('posts', 'posts.user_id', '=', 'users.id')
              ->join('comments', 'comments.post_id', '=', 'posts.id')
              ->get(['users.*', 'posts.descrption']);

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