Laravel 9 Working with MySQL Inner Join Tutorial

When we work with MySQL Queries, then definitely for some relational data we need to work with Joins. Inside this article we will see the concept of Laravel 9 Working with MySQL Inner Join.

Joins in Laravel 9 is the connection between one and more tables to get data. In MySQL we have Inner join, Left join, Right join etc.

We will see the concept of Inner Join in this Laravel 9 article. This article will give you the detailed concept of about implementation of Inner Join in laravel 9.

For this tutorial we will consider a employees table and a projects table.

Learn More –

• Laravel 9 Many to Many Eloquent Relationship Tutorial
• Laravel 9 Markdown Mailable Email Template Components
• Laravel 9 One to Many Eloquent Relationship Tutorial
• Laravel 9 One to One Eloquent Relationship Tutorial

Let’s get started.

Types of Joins

In Laravel 9 application, as per the documentation we have following types of joins available –

• Inner Join
• Left Join
• Right Join
• Cross Join

What is Inner Join?

Inner Join – This join brings the data on the basis of a common value condition between two or more than two tables. According to matched condition it will bring all data what we expected for. It remove those rows from result set which has no matched condition.

Laravel Installation

Open terminal and run this command to create a laravel project.

composer create-project laravel/laravel myblog

It will create a project folder with name myblog inside your local system.

To start the development server of laravel –

php artisan serve

URL: http://127.0.0.1:8000

Assuming laravel already installed inside your system.

Create Database & Connect

To create a database, either we can create via Manual tool of PhpMyadmin or by means of a mysql command.

CREATE DATABASE laravel_app;

To connect database with application, Open .env file from application root. Search for DB_ and update your details.

DB_CONNECTION=mysql
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=laravel_app
DB_USERNAME=root
DB_PASSWORD=root

Create Migrations & Model

Next,

Let’s create migrations and models for Employees and Projects table.

Open project into terminal and run this artisan command.

$ php artisan make:model Employee -m

It will create two files –

• Model file Employee.php inside /app/Models folder.
• Migration file 2022_05_15_062204_create_employees_table.php inside /database/migrations folder.

$ php artisan make:migration create_projects_table

It will create a migration file 2022_05_15_062234_create_projects_table.php inside /database/migrations folder.

Open xxx_create_employees_table.php and write this following code into it.

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

return new class extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('employees', function (Blueprint $table) {
            $table->id();
            $table->string("name", 50);
            $table->string("email", 50);
            $table->string("phone_no", 20);
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('employees');
    }
};

Open xxx_create_projects_table.php and write this following code into it.

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

return new class extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('projects', function (Blueprint $table) {
            $table->id();
            $table->integer('employee_id')->unsigned();
            $table->string("project_name", 100);
            $table->foreign('employee_id')
                ->references('id')->on('employees')
                ->onDelete('cascade');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('projects');
    }
};

Migrate Migrations

Back to terminal and run this command to migrate all migrations.

$ php artisan migrate

This command will migrate all.

Insert Test Data For Tables

Here,

We have some mysql queries which will insert test data to employees and projects table.

Copy command and run into SQL tab of mysql database.

--
-- Dumping data for table `employees`
--

INSERT INTO `employees` (`id`, `name`, `email`, `phone_no`) VALUES
(1, 'Sanjay Kumar', 'sanjay@gmail.com', '8527419630'),
(2, 'Vijay Kumar', 'vijay@gmail.com', '9632587410'),
(3, 'Ashish Kumar', 'ashish@gmail.com', '7896541356');

--
-- Dumping data for table `projects`
--

INSERT INTO `projects` (`id`, `employee_id`, `project_name`) VALUES
(1, 1, 'Project 4'),
(2, 2, 'Project 7'),
(3, 3, 'Project 50');

Create Controller

Open project into terminal and run this command.

$ php artisan make:controller SiteController

It will create SiteController.php file inside /app/Http/Controllers folder.

Open SiteController.php and write this code into it.

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Models\Employee;

class SiteController extends Controller
{
    public function getData()
    {
        $data = Employee::join("projects", function ($join) {
            $join->on("projects.employee_id", "=", "employees.id");
        })->get();
        
        echo "<pre>";
        print_r($data);
    }
}

Inner Join Logic

$data = Employee::join("projects", function ($join) {
             $join->on("projects.employee_id", "=", "employees.id");
})->get();

OR

$data = Employee::join("projects", "projects.employee_id", "=", "employees.id")->get();

Generated Query

To get last executed query –

$query = Employee::join("projects", function ($join) {
    $join->on("projects.employee_id", "=", "employees.id");
})->toSql();

Query will be –

select * from `employees` inner join `projects` on `projects`.`employee_id` = `employees`.`id`

Add Route

Open web.php file from /routes folder.

//...

use App\Http\Controllers\SiteController;

Route::get("inner-join", [SiteController::class, "getData"]);

//...

Application Testing

Run this command into project terminal to start development server,

php artisan serve

URL – http://127.0.0.1:8000/inner-join

You will get your data set at output screen.

Advanced Cases in Inner Join

Assuming these cases, you can take a hint from these.

Example 1: Laravel Eloquent Join() with 2 Tables

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

Generated Query

select `users`.*, `posts`.`descrption` from `users`  inner join `posts` on `users`.`id` = `posts`.`user_id`

Example 2: Laravel Eloquent Join() with 3 Tables

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

Generated Query

select `users`.*, `posts`.`descrption` from `users`  inner join `posts` on `posts`.`user_id` = `users`.`id`  inner join `comments` on `comments`.`post_id` = `posts`.`id`

Example 3: Laravel Eloquent Join() with Multiple Conditions

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

Generated Query

select `users`.*, `posts`.`descrption` from `users`  inner join `posts` on `posts`.`user_id` = `users`.`id`  where `users`.`status` = active and `posts`.`status` = active

We hope this article helped you to learn about Laravel 9 Working with MySQL Inner Join Tutorial in a very detailed way.

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