[ 'type' => 'DECIMAL', 'constraint' => '12,4', 'null' => false, 'after' => 'total_deduction', ], 'nontaxable_deduction' => [ 'type' => 'DECIMAL', 'constraint' => '12,4', 'null' => false, 'after' => 'taxable_deduction', ], ]; $this->forge->addColumn('emp_pay_trans', $fields); } public function down() { $fields = [ 'taxable_deduction', 'nontaxable_deduction', ]; $this->forge->dropColumn('emp_pay_trans', $fields); } }