laravel outer join

1Inner Join 	: ->join('contacts', 'users.id', '=', 'contacts.user_id')
2Left Join 	: ->leftJoin('posts', 'users.id', '=', 'posts.user_id')
3Right Join 	: ->rightJoin('posts', 'users.id', '=', 'posts.user_id')
4Cross Join 	: ->crossJoin('colors')
5
6Advance Queries : 
7----------------- 
8 		->join('contacts', function ($join) {
9            $join->on('users.id', '=', 'contacts.user_id')
10                 ->where('contacts.user_id', '>', 5);
11        })
12  

1$users = DB::table('users')
2            ->join('contacts', 'users.id', '=', 'contacts.user_id')
3            ->join('orders', 'users.id', '=', 'orders.user_id')
4            ->select('users.*', 'contacts.phone', 'orders.price')
5            ->get();

1 $customer = DB::table('customers')
2                ->join('shops', 'customers.shop_id', '=', 'shops.shop_id')
3                ->where('customer_contact', $contact_no)
4                ->get();

1$subCategories = Subcategory::join('categories', 'subcategories.category_id', '=', 'categories.id')
2                              ->select('subcategories.*', 'categories.name AS cname')
3                              ->orderBy('id', 'desc')
4                              ->get();
5

1$latestPosts = DB::table('posts')
2                   ->select('user_id', DB::raw('MAX(created_at) as last_post_created_at'))
3                   ->where('is_published', true)
4                   ->groupBy('user_id');
5
6$users = DB::table('users')
7        ->joinSub($latestPosts, 'latest_posts', function ($join) {
8            $join->on('users.id', '=', 'latest_posts.user_id');
9        })->get();

1->join('answers as answers', 'responses.answer_id', '=', 'answers.id', 'left outer')