Use Join Query in Laravel 7|8 Eloquent to Boost Performance

Last updated on by Digamber

This is a comprehensive Laravel 7 Tutorial about the Join query. We will explain how to use Joins query in Laravel and explain the types of Join in laravel.

Suppose you need to refactor query scripts to elevate their performance. So, we are going to understand by an example, how to work with laravel join queries to sustain the performance intact.

At the time of laravel application development, we must have seen that we make mistakes writing database queries. Reasons could be anything, whether due to less knowledge of laravel queries or recklessness.

It doesn’t bother a lot when the size of the web application is small. But what if the size of the application is more massive. Initially, developers spend time learning other functionalities, but they start paying attention later to the application’s performance.

We will talk about Laravel Eloquent MySQL queries that help in wring queries and optimizing the performance. Eloquent is a divine boon that is a simple yet powerful way of dealing with records or data in the database.

Inner Join Clause in Laravel

Most of the time, we have to get two or more records from the n number of tables. So, Join clause helps in laravel without putting intensive efforts.

In this, we understand what does Inner Join condition stand for? The Inner Join clause fetch the records from the database tables, especially if the provided column property matches both the tables.

<?php
namespace App\Http\Controllers;

use App\Http\Controllers\Controller;
use App\Student;

class MyController extends Controller
{

    public function index()
    {
        $result = Student::join('students', 'students.id', '=', 'posts.id')
                ->select('students.*')
                ->get();

        print_r($result);
    }

}

Cross Join Clause in Laravel

If you want to cross join all the rows from the first table multiplied with the second table’s rows. Then you should use the CROSS JOIN clause in Laravel.

<?php
namespace App\Http\Controllers;

use App\Http\Controllers\Controller;
use App\Student;

class MyController extends Controller
{

    public function index()
    {
        $result = Student::crossJoin('posts')
                ->get();                

        print_r($result);
    }

}

Laravel Left Join Clause Example

If you want to fetch all rows from the left table, then go for the laravel LEFT Join clause. The good thing about this is that it returns the data fro the right table even if it doesn’t match. However, the result will be Null.

<?php
namespace App\Http\Controllers;

use App\Http\Controllers\Controller;
use App\Student;

class MyController extends Controller
{

    public function index()
    {
        $result = Student::leftJoin('students', 'students.id', '=', 'posts.id')
                ->select('students.*')
                ->get();

        print_r($result);
    }

}

Laravel Right Join Clause Example

The other way around, this is the just opposite from the previous example. Suppose If you want to fetch all rows from the right table, then use laravel RIGHT JOIN clause. it returns the data from the left table unlike if it doesn’t match, although, the result will be null.

<?php
namespace App\Http\Controllers;

use App\Http\Controllers\Controller;
use App\Student;

class MyController extends Controller
{

    public function index()
    {
        $result = Student::rightJoin('students', 'students.id', '=', 'posts.id')
                ->select('students.*')
                ->get();

        print_r($result);
    }

}

The Bottom Line

Eventually, we have completed the Laravel JOIN tutorial; in this tutorial, we learned how to deal with Inner Join, Cross Join, Left Join, and Right Join. I hope it will give you some clear and more precious understanding of working with laravel join queries.