To set each author contract number to zero, simply leave off the WHERE clause.
If you do not specify a row, then all rows are updated when Oracle update is used.
you cannot dynamically access them, only 'statically'. As usual, you do a great job of answering them and I greatly appreciate your insights.
I suggest you consider writing a stored procedure or sql*plus script to write a trigger that statically references the new/old values. My problem is that I need something much more dynamic. However, my problem with that is contractor client REQUIREMENT and didn't see any other way to do that.
I'm trying to create a generic before update trigger which will compare all :old.column_values to all :new.column_values.
If the column_values are different, then I would like to log the change to a separate table. :new and :old are like bind variables to the trigger, they are not 'regular' variables. LOC); end; / I've been reading several related scenarios to this one.
As we’ve already created both the tables in above example, we will directly write a trigger for ‘AFTER UPDATE’.
CREATE or REPLACE TRIGGER emp_after_update AFTER UPDATE OF empid ON emp FOR EACH ROW DECLARE BEGIN update emp_backup set empid = :new.empid where empid = :old.empid; DBMS_OUTPUT.
It works, but it won't tell you if the value changed, only that the column is being updated (even if the update doesn't change the value).