unit price zero values

gistfile1.txt

 select id_sales_order_item,created_at from sales_order_item where (original_unit_price=0 || original_unit_price IS NULL) and created_at >'2016-07-25 00:00:00';
+---------------------+---------------------+
| id_sales_order_item | created_at          |
+---------------------+---------------------+
|            84911406 | 2016-07-29 04:54:40 |
|            84911408 | 2016-07-29 04:54:40 |
|            84911410 | 2016-07-29 04:54:40 |
|            84911418 | 2016-07-29 05:00:06 |
|            84911420 | 2016-07-29 05:00:06 |
|            84911426 | 2016-07-29 05:01:33 |
|            84911428 | 2016-07-29 05:01:33 |
|            84911430 | 2016-07-29 05:01:33 |
|            84911432 | 2016-07-29 05:01:33 |
|            84911434 | 2016-07-29 05:01:33 |
|            84911438 | 2016-07-29 05:01:42 |
|            84911440 | 2016-07-29 05:01:42 |
|            84911442 | 2016-07-29 05:01:42 |
|            84911446 | 2016-07-29 05:02:00 |
|            84911448 | 2016-07-29 05:02:00 |
|            84911450 | 2016-07-29 05:02:00 |
|            84911452 | 2016-07-29 05:02:02 |
|            84911454 | 2016-07-29 05:02:02 |
|            84911458 | 2016-07-29 05:02:34 |
|            84911462 | 2016-07-29 05:03:38 |
|            84911464 | 2016-07-29 05:05:58 |
|            84911528 | 2016-07-29 05:13:59 |
|            84911530 | 2016-07-29 05:13:59 |
|            84911532 | 2016-07-29 05:13:59 |
|            84911534 | 2016-07-29 05:13:59 |
|            84911536 | 2016-07-29 05:14:00 |
|            84911538 | 2016-07-29 05:14:00 |
|            84911540 | 2016-07-29 05:14:00 |
|            84911542 | 2016-07-29 05:14:00 |
|            84911544 | 2016-07-29 05:14:00 |
|            84911546 | 2016-07-29 05:14:00 |
|            84911548 | 2016-07-29 05:14:00 |
|            84911550 | 2016-07-29 05:14:00 |
|            84911552 | 2016-07-29 05:14:00 |
|            84911554 | 2016-07-29 05:14:00 |
|            84911556 | 2016-07-29 05:14:00 |
|            84911558 | 2016-07-29 05:14:00 |
|            84911560 | 2016-07-29 05:14:00 |
|            84911562 | 2016-07-29 05:14:00 |
|            84911564 | 2016-07-29 05:14:00 |
|            84911566 | 2016-07-29 05:14:00 |
|            84911568 | 2016-07-29 05:14:00 |
|            84911570 | 2016-07-29 05:14:00 |
|            84911572 | 2016-07-29 05:14:00 |
|            84911574 | 2016-07-29 05:14:00 |
|            84911576 | 2016-07-29 05:14:00 |
|            84911580 | 2016-07-29 05:14:00 |
+---------------------+---------------------+
47 rows in set (0.57 sec)