I have seen this before. My result grid is displaying null for dates that have values in them. My query even filters for where date is not null yet all of the results show null. Has anyone else ever experienced this?
Select patient, visit_dte, birthtime
from visit table
where visit_dte is not null
The result set in Toad Data Point shows all nulls, but when I run in Sql Developer they all show dates as expected.