SQL vs ORM

example.php

<?php

// ...

	/**
	 * Check if an employee has the training $training_id
	 *
	 * @since 2.2.3
	 * @static
	 * @param int $employee_id
	 * @param int $training_id
	 * @return bool
	 */
	public static function has_training($employee_id, $training_id)
	{

		// Current, native SQL
		return (bool) DB::select('employee.id')
			->from('employee')
			->join('training_registration')
			->on('employee.id', '=', 'training_registration.employee_id')
			->join('training_schedule')
			->on('training_schedule.id', '=', 'training_registration.schedule_id')
			->where('employee.id', '=', $employee_id)
			->where('training_schedule.training_id', '=', $training_id)
			->execute()
			->count();
		
		// Better, ORM solution
		return $this->has('training',$training_id);
	}