What is the difference between "= NULL" and "IS NULL" in SQL?

Question

Hi,
I believe there is a difference between "= NULL" and "IS NULL" comparsion, but I couldn't find it. Anyone knows the difference?
Thanks,
Denny

Answer 1

Aha, thanks:
SQL> create table william_test_tab (col binary_double);
Table created.
SQL> insert into william_test_tab
  2  select rownum / (rownum - 1) from user_tables where rownum < 4;
select rownum / (rownum - 1) from user_tables where rownum < 4
ERROR at line 2:
ORA-01476: divisor is equal to zero
SQL> insert into william_test_tab
  2  select 1d * rownum / (rownum - 1) from user_tables where rownum < 4;
3 rows created.
SQL> select * from william_test_tab;
       COL
       Inf
  2.0E+000
  1.5E+000
3 rows selected.
SQL> select * from william_test_tab where col is infinite;
       COL
       Inf
1 row selected.
SQL>