Selecting an "empty" date formated field

Posted on 16th Feb 2014 by admin

How do you select an "empty" date field? I've tried the few ways I can think.
SQL> select prclid from parcel
2 where expdate = '';

no rows selected

SQL> select prclid from parcel
2 where expdate = null;

no rows selected
There are are "empty" date fields in the table as seen here.

SQL> select expdate from parcel
2 where prclid ='20131570070000';

EXPDATE

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