Gradute Majors:
Schema::create('graduate_majors', function (Blueprint $table) {
    $table->id();
    $table->string('major')->nullable();  
    $table->unsignedBigInteger('program_id');
    $table->foreign('program_id')->references('id')->on('graduate_program')->onDelete('cascade');
    $table->timestamps();
});
Gradute Programs: 
Schema::create('graduate_program', function (Blueprint $table) {
    $table->id();
    $table->string('description');
    $table->timestamps();
});