education-project/database/migrations/2020_12_13_200032_create_journals_table.php

<?php

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

class CreateJournalsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('journals', function (Blueprint $table) {
            $table->id();
            $table->unsignedBigInteger('teacher_id');
            $table->unsignedBigInteger('student_id');
            $table->unsignedBigInteger('subject_id');
            $table->unsignedBigInteger('score');
            $table->string('comment')->nullable();
            $table->timestamps();

            $table->foreign('subject_id')
                ->references('id')->on('subjects');

            $table->foreign('teacher_id')
                ->references('id')->on('teachers')
                ->onDelete('cascade');

            $table->foreign('student_id')
                ->references('id')->on('students')
                ->onDelete('cascade');
        });
    }

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