select task_num,contractor_id_ord,operator_id,order_type_code,task_date,contract_id,date_deleted
from str$orders
where order_num IN ('11-ДК-20-486','11-ДК-20-487','11-ДК-20-488')

"777" 19448 1 2 "2020-07-28 00:00:00" 235 "2020-07-28 16:45:26"
"777" 19448 1 2 "2020-07-28 00:00:00" 235
"777" 19448 1 2 "2020-07-28 00:00:00" 235

2-я и 3я запись - дубли