[ 'type' => 'VARCHAR', 'constraint' => 35, 'null' => true, 'after' => 'savings_account', ], 'basic_semi_monthly_pay' => [ 'type' => 'DECIMAL', 'constraint' => '12,4', 'null' => false, 'after' => 'basic_monthly_pay', ], ]; $this->forge->addColumn('emp_pay_trans', $fields); } public function down() { $fields = [ 'basic_sal_computation', 'basic_semi_monthly_pay' ]; $this->forge->dropColumn('emp_pay_trans', $fields); } }