Sequence nextval reset at every month with 1

Question

I want to change Sequence Nextval = 1 at every month
I m using this sequence
create sequence VoucherNo
minvalue 1
maxvalue 9999999
start with 1
increment by 1
Order;i want then when start next month sequence nextval should be 1 .
reset with 1.

Answer 1

Dont't recreate the sequence! You would invalidate all independent objects and lose all privileges granted for the sequences.
Instead try this:SQL>CREATE SEQUENCE SEQ_TEST
  2   START WITH  1
  3   INCREMENT BY  1
  4   MINVALUE  1
  5   MAXVALUE  9999999;
Sequence created.
SQL>
SQL>SELECT SEQ_TEST.NEXTVAL
  2    FROM all_objects WHERE ROWNUM < =10;
   NEXTVAL
         1
         2
         3
         4
         5
         6
         7
         8
         9
        10
10 rows selected.
SQL>
SQL>DECLARE
  2     Val   NUMBER;
  3  BEGIN
  4     SELECT SEQ_TEST.CURRVAL
  5       INTO Val
  6       FROM DUAL;
  7
  8     EXECUTE IMMEDIATE 'ALTER SEQUENCE SEQ_TEST INCREMENT BY ' || TO_CHAR(1 - Val);
  9
10     SELECT SEQ_TEST.NEXTVAL
11       INTO Val
12       FROM DUAL;
13
14     EXECUTE IMMEDIATE 'ALTER SEQUENCE SEQ_TEST INCREMENT BY 1';
15
16     DBMS_OUTPUT.put_line('New value of SEQ_TEST is ' || TO_CHAR(Val));
17  END;
18  /
New value of SEQ_TEST is 1hth, Urs