If you use CONNECT BY x <= y , then at least one of the following should be true:
- There is exactly 1 row in the table
- You have other conditions, using the PRIOR operator, in the CONNECT BY clause
Try something like this:
CONNECT BY start_date_time + ((level - 1) /24) <= end_date_time -- each hour between dates
AND PRIOR schedule_id = schedule_id -- or anything that is unique
AND PRIOR SYS_GUID () IS NOT NULL
I hope this answers your question.
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You just need to add some conditions in the connect by.
and prior schedule_id = schedule_id and prior dbms_random.value is not null
Btw, I don't think you need the where clause; you ought to be able to amend the time period in the connect by to restrict the rows as required. You might need to add trunc(<date>, 'hh') as necessary (maybe in the select list too, if your start/end times aren't always on the hour but you need your report to be on the hour).
Maybe something like:
SELECT (dates.start_date_time + (LEVEL - 1) / 24) start_date_time, dates.examiner_id, dates.schedule_id FROM (SELECT -- bmv.schedule.common.data.AutoExaminerSchView schedule_id, start_date_time, end_date_time, examiner_id, exam_status FROM schedule_test WHERE start_date_time >= TO_DATE ('1/6/2014 7', 'MM/DD/YYYY HH24') -- during the AND end_date_time <= TO_DATE ('1/10/2014 15', 'MM/DD/YYYY HH24') -- scheduling week AND exam_status = 'AVAILABLE' -- with available schedule ) dates CONNECT BY dates.start_date_time + LEVEL / 24 <= dates.end_date_time -- each hour between dates and prior schedule_id = schedule_id and prior dbms_random.value is not null ORDER BY dates.start_date_time + LEVEL / 24, dates.examiner_id, dates.schedule_id;