Query to return multiple rows with same UID and entered on the same date
If you need to output rows where the same date appears more than once for a give orderuid, the following should to the job : 

SELECT orderuid, ordernumber, datein 
FROM 
(
  SELECT a.orderuid,a.ordernumber,a.datein, 
   count(1) OVER(PARTITION BY a.orderuid,a.datein) as num_with_same_date
        from  ordertask a
)b WHERE num_with_same_date &gt;1;


Updated.  

SELECT orderuid, ordernumber, datein 
FROM 
(
  SELECT a.orderuid,a.ordernumber,a.datein, 
   count(1) OVER(PARTITION BY a.orderuid,a.datein) as num_with_same_date,
   count(1) OVER(partition by a.orderuid) as total_num_uid 
        from  ordertask a
)b WHERE total_num_uid =num_with_same_date  ;