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Set '-' to Date which is MinValue

Last Modified: 2012-05-11
if the  sa1.actualtime for lab is NULL and the sa1.actualtime for evaluation has value,
it will not show any records for the row, unless sa1.actualtime for lab has value.

while using NULLIF(sa1.actualtime, '-')
it does not show any records at all,

Is there any like if Date is minvalue then replace '-' character in it.
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