Trigger if updating inserting
Transact-SQL Syntax Conventions Is the name of the column to test for either an INSERT or UPDATE action.
Because the table name is specified in the ON clause of the trigger, do not include the table name before the column name.
Once the trigger is created, entering the following SQL statement: A trigger is either a stored PL/SQL block or a PL/SQL, C, or Java procedure associated with a table, view, schema, or the database itself.
Oracle automatically executes a trigger when a specified event takes place, which may be in the form of a system event or a DML statement being issued against the table.
UPDATE() is used anywhere inside the body of a Transact-SQL INSERT or UPDATE trigger to test whether the trigger should execute certain actions.
A database trigger is a stored procedure that automatically executes whenever an event occurs. Oracle initiates an ‘AFTER INSERT’ trigger after an insert event has been occurred and an ‘AFTER UPDATE’ trigger after an update event has been occurred.
CREATE or REPLACE TRIGGER emp_after_insert AFTER INSERT ON emp FOR EACH ROW DECLARE BEGIN insert into emp_backup values (:new.empid, :new.fname, :new.lname); DBMS_OUTPUT.
Boolean UPDATE() returns TRUE regardless of whether an INSERT or UPDATE attempt is successful.
To test for an INSERT or UPDATE action for more than one column, specify a separate UPDATE() clause following the first one.
The column can be of any data type supported by SQL Server.