Final answer:
Yes, the Oracle DBMS supports the SQL BEFORE trigger, which is used to execute code prior to a DML event like INSERT or UPDATE.
Step-by-step explanation:
The Oracle Database Management System (DBMS) does indeed support the SQL BEFORE trigger. A BEFORE trigger is a type of database trigger that is executed before a specified data manipulation language (DML) event occurs, such as before an INSERT, UPDATE, or DELETE operation. Oracle provides both BEFORE and AFTER triggers, allowing developers to execute code at specific points relative to data modifications. Triggers can be used for enforcing business rules, checking or modifying values, and maintaining audit trails, among other tasks.
In Oracle, you could use a BEFORE INSERT trigger to check or modify the value of new data before it is committed to the database. Similarly, a BEFORE UPDATE trigger can be used to verify that certain conditions are met or to automatically update certain fields whenever a row is updated. The syntax for creating a BEFORE trigger in Oracle may look something like this:
CREATE OR REPLACE TRIGGER before_insert_example
BEFORE INSERT ON table_name
FOR EACH ROW
BEGIN
-- Trigger logic here
END;
In this example, the trigger is set to run before a new row is inserted into 'table_name.' The 'FOR EACH ROW' clause specifies that the trigger should fire once for each row affected by the triggering event.