Question

I have a table called TBL_CAS. In that, FLD_ID as auto increment column and another column is called FLD_CAS_CODE. Now I need to add CAS- as a prefix to FLD_ID and Insert into FLD_CAS_CODE. I need to do this in trigger. I was tried with the below code, But the data in not inserting, What is the problem ?

CREATE OR REPLACE TRIGGER TBL_CAS_TRG
BEFORE  INSERT ON TBL_CAS
FOR EACH ROW
BEGIN
:NEW.FLD_CAS_CODE := TO_CHAR ('CAS')||'-'||:NEW.FLD_ID;
END;

I mean `”cas-“+”fld_id”=”cas-fld_id”‘

Answer 1

which part isn’t working exactly? as your trigger seem to work just fine.

SQL> create table TBL_CAS( FLD_ID number, FLD_CAS_CODE varchar2(20));

Table created.

SQL> CREATE OR REPLACE TRIGGER TBL_CAS_TRG
  2  BEFORE  INSERT ON TBL_CAS
  3  FOR EACH ROW
  4  BEGIN
  5  :NEW.FLD_CAS_CODE := TO_CHAR ('CAS')||'-'||:NEW.FLD_ID;
  6  END;
  7  /

Trigger created.

SQL> insert into TBL_CAS (fld_id) values (1001);

1 row created.

SQL> select * From TBL_CAS;

    FLD_ID FLD_CAS_CODE
---------- --------------------
      1001 CAS-1001

SQL>