Auto Generated No with Date and year

Question

I m using this method to create a auto generated no.
in pre-insert trigger
declare
          v_l varchar2(10);
     begin
          select max(doc_no) into v_l from Table ;
          if v_l is not null or v_l<>0 then
               :table.doc_no:= v_l+1;
          else
               :table.doc_no:=1;     
          end if;
     exception
          when no_data_found then
          :table.doc_no:=1;
     end;I want to generate auto generate no|| month||year
please guide me

Answer 1

Kame wrote:
I want to generate auto generate no|| month||year
please guide meYou can get an auto-generated number using SEQUENCE in Oracle.
Do you have a specific date column in your table from which you need to get the MONTH and YEAR Data?
To get MONTH, you can use something like:
TO_CHAR(your_date_column, 'MONTH')To get YEAR, you can use
TO_CHAR(your_date_column, 'YYYY')your_date_column should contain data of date datatype.
Examples:
SQL> CREATE SEQUENCE SEQ
  2     MINVALUE 1
  3     MAXVALUE 999999999
  4     START WITH 1
  5     INCREMENT BY 1
  6  /
Sequence created.
SQL> SELECT SYSDATE FROM Dual
  2  /
SYSDATE
10-JUN-09
SQL> SELECT TO_CHAR(sysdate, 'MONTH') FROM Dual
  2  /
TO_CHAR(SYSDATE,'MONTH')
JUNE
SQL> SELECT TO_CHAR(sysdate, 'YYYY') FROM Dual
  2  /
TO_C
2009
SQL> SELECT      TO_CHAR (SEQ.NEXTVAL)
  2           || TO_CHAR (SYSDATE, 'fmMONTH')
  3           || TO_CHAR (SYSDATE, 'YYYY')
  4              auto_gen
  5    FROM   DUAL
  6  /
AUTO_GEN
1JUNE2009
SQL> /
AUTO_GEN
2JUNE2009
SQL> /
AUTO_GEN
3JUNE2009
SQL> /
AUTO_GEN
4JUNE2009
SQL>Hope this helps.
Regards,
Jo
Edit: Corrected Query