Why not change?

I have a table with of line level Before Insert trigger defined on it. It refreshes Col2 to the new value of Col1 if Col3 = 2. I thought it must trigger an error mutation. But it is not... any ideas why?

CREATE TABLE zaaf_tbl 
   ( col1 NUMBER, 
     col2 VARCHAR2(30), 
     col3 NUMBER 
   )
/
CREATE TRIGGER zaaf_tbl_rl_bi
    BEFORE INSERT ON zaaf_tbl 
    FOR EACH ROW
DECLARE 
BEGIN 
  IF :new.col3 = 2 THEN 
    BEGIN 
      UPDATE zaaf_tbl
         SET col2 = 'Col2 Updated'
       WHERE col1 = :new.col1;
    END;
  end IF;
END;
/

Most likely, you are using INSERT INTO VALUES synatx. In this case, Oracle knows with certainty that a row is inserted and so the table is clearly defined - before row trigger is activated only once, so state table is even because it is first of all insert. If Oracle does not know that it will for sure increase, table is the mutation of exception:

SQL> insert
  2    into zaaf_tbl
  3    values(1,'A',2)
  4  /

1 row created.

SQL> insert
  2    into zaaf_tbl
  3    select 1,'A',2 from dual
  4  /
  into zaaf_tbl
       *
ERROR at line 2:
ORA-04091: table SCOTT.ZAAF_TBL is mutating, trigger/function may not see it
ORA-06512: at "SCOTT.ZAAF_TBL_RL_BI", line 5
ORA-04088: error during execution of trigger 'SCOTT.ZAAF_TBL_RL_BI'

SQL>

SY.

Tags: Database

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