Limitando Acesso a tabela por Horário

SQL> column sysdate format a30
SQL> select sysdate from dual;

SYSDATE
------------------------------
12-10-2009 14:35:33

SQL> create table teste as (select * from dba_objects);

Table created

SQL> select count(*) from teste;

COUNT(*)
----------
49788

SQL> create or replace view vw_teste as select * from teste where to_char(sysdate,'HH24') between 17 and 18;

View created

SQL> select count(*) from vw_teste;

COUNT(*)
----------
0