In this article, we will see the inner join query in the laravel 9 examples. Also, see how to join two tables in laravel 9. In laravel 9 you can use group by query same as PHP. So, we will also see laravel 9 inner join query 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.

So, let's see an example of laravel 9 joining two tables, inner join in laravel 9, join query in laravel 9, laravel 9 inner join group by, inner join query in MySQL, and subquery joins in laravel 9

For the laravel inner join query example, we need the first argument passed to the join method to be 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, laravel 9. 

 

In this example, we will create a users table and countries table. we will add the country_id  foreign key to the user's table. So, when I get users at that time we will get the country name from country_id using an inner join.

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

 

 

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

 

In this example, select data like id, name email, and country name but if you want all fields then you can use * to 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();

 

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');

 

 

Now, we will give an example of joining 3 tables 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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