Regarding TO_DATE function and Default Date Format DD-MON-YY

I am using oracle 10.2 version. As far as my knowledge default date format is 'DD-MON-YY'. I want to know that why first query is not giving result.
SQL> select sysdate from dual
2 where sysdate = to_date('06-JUL-11','DD-MON-YY');
no rows selected
SQL> select sysdate from dual
2 where to_date(to_char(sysdate),'DD-MON-YY') = to_date('06-JUL-11','DD-MON-YY');
SYSDATE
06-JUL-11
Thanks,
Rohit

A date in Oracle always contains hours, minutes and seconds. These values can optionally all evaluate to zeroes, at midnight.
TO_DATE('06-JUL-11','DD-MON-YY') means midnight of the sixth of july 2011.
So
sysdate = to_date('06-JUL-11','DD-MON-YY') only at midnight of the sixth of july 2011...
While during the day, after midnight,
trunc(sysdate) = to_date('06-JUL-11','DD-MON-YY')and
sysdate > to_date('06-JUL-11','DD-MON-YY')Max

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