QUERY: CREATE TABLE OID_TBL(f1 oid);
QUERY: INSERT INTO OID_TBL(f1) VALUES ('1234');
QUERY: INSERT INTO OID_TBL(f1) VALUES ('1235');
QUERY: INSERT INTO OID_TBL(f1) VALUES ('987');
QUERY: INSERT INTO OID_TBL(f1) VALUES ('-1040');
QUERY: INSERT INTO OID_TBL(f1) VALUES ('');
QUERY: INSERT INTO OID_TBL(f1) VALUES ('asdfasd');
ERROR:  pg_atoi: error in "asdfasd": can't parse "asdfasd"
QUERY: SELECT '' AS five, OID_TBL.*;
five|   f1
----+-----
    | 1234
    | 1235
    |  987
    |-1040
    |    0
(5 rows)

QUERY: SELECT '' AS one, o.* FROM OID_TBL o WHERE o.f1 = '1234'::oid;
one|  f1
---+----
   |1234
(1 row)

QUERY: SELECT '' AS four, o.* FROM OID_TBL o WHERE o.f1 <> '1234';
four|   f1
----+-----
    | 1235
    |  987
    |-1040
    |    0
(4 rows)

QUERY: SELECT '' AS four, o.* FROM OID_TBL o WHERE o.f1 <= '1234';
four|   f1
----+-----
    | 1234
    |  987
    |-1040
    |    0
(4 rows)

QUERY: SELECT '' AS three, o.* FROM OID_TBL o WHERE o.f1 < '1234';
three|   f1
-----+-----
     |  987
     |-1040
     |    0
(3 rows)

QUERY: SELECT '' AS two, o.* FROM OID_TBL o WHERE o.f1 >= '1234';
two|  f1
---+----
   |1234
   |1235
(2 rows)

QUERY: SELECT '' AS one, o.* FROM OID_TBL o WHERE o.f1 > '1234';
one|  f1
---+----
   |1235
(1 row)

QUERY: DROP TABLE  OID_TBL;