Create Sequence which return only +1 and -1

Please Help me to create a sequence which return only two values
i.e. +1 and -1

How about this?
SQL> CREATE SEQUENCE test_sequence INCREMENT BY 2 START WITH -1 MINVALUE -1 MAXVALUE 1 CYCLE NOCACHE;
Sequence created.
SQL> SELECT test_sequence.nextval FROM DUAL;
   NEXTVAL
        -1
SQL> SELECT test_sequence.nextval FROM DUAL;
   NEXTVAL
         1
SQL> SELECT test_sequence.nextval FROM DUAL;
   NEXTVAL
        -1
SQL>Here is some further reading on sequences:
http://www.psoug.org/reference/sequences.html

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hi,
hope help you...
this is my basic generic solution...
create or replace procedure createSequence( psequenceName in varchar2 ) is
begin
execute immediate 'create sequence ' || psequenceName ;
execute immediate 'grant select on ' || psequenceName || ' to public ';
end ;
create or replace function getNextVal( psequenceName in varchar2 ) return number is
queryText varchar2(100) := 'select <sequence_name>.nextval into :next_value from DUAL' ;
next_value number ;
begin
queryText := replace(queryText,'<sequence_name>',psequenceName);
execute immediate queryText into next_value ;
return( next_value ) ;
end ;
Edited by: edogt on Nov 27, 2008 5:33 AM
Edited by: edogt on Nov 27, 2008 5:35 AM
Edited by: edogt on Nov 27, 2008 5:35 AM

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Create Sequence which return only +1 and -1

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