How to use sysdate

Question

SQL> create table test1(
2 DOB date);
Table created.
SQL> insert into test1
2 values(sysdate);
1 row created.
SQL> select * from test1;
DOB
27-APR-2007
SQL> insert into test1
2 values(sysdate+1);
1 row created.
SQL> select * from test1;
DOB
27-APR-2007
28-APR-2007
SQL> insert into test1
2 select * from test1
3 where
4 DOB=sysdate;
0 rows created.
Why it is not creating any rows in test1 table?

Answer 1

insert into test1
select * from test1 where dob like sysdate
also works with automatic casting :DTry this:
with
  t as
      select sysdate - 1/4 as dt from dual
select *
  from t
where dt like sysdate
Query finished, retrieving results...
         DT         
27-APR-2007 10:37:30
1 row(s) retrieved
alter session set nls_date_format = 'dd.mm.yyyy hh24:mi:ss';
session altered
with
  t as
      select sysdate - 1/4 as dt from dual
select *
  from t
where dt like sysdate
Query finished, retrieving results...
         DT         
0 row(s) retrieved