!= should give error?

Hi,

with below query I am getting unexpected output. here !<space>= is behaving as =
is this expected behaviour?

postgres=# create table tbl (col_a int, col_b int);
CREATE TABLE
postgres=# insert into tbl values (1,2);
INSERT 0 1
postgres=# insert into tbl values (2,1);
INSERT 0 1
postgres=# select * from tbl where col_a ! = 1;
 col_a | col_b
-------+-------
     1 |     2
(1 row)

postgres=# select * from tbl where col_a = 1;
 col_a | col_b
-------+-------
     1 |     2
(1 row)

Thanks & Regards,
Rajkumar Raghuwanshi
QMG, EnterpriseDB Corporation