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CREATE OR REPLACE TRIGGER my_test_trg BEFORE INSERT OR UPDATE OR DELETE ON my_table FOR EACH ROW BEGIN -- Flags are booleans and can be used in any branching construct. If you need some code to perform an operation that needs to commit, regardless of the current transaction, you should put it in a stored procedure defined as an autonomous transaction, shown here.CASE WHEN INSERTING THEN -- Include any code specific for when the trigger is fired from an INSERT. WHEN UPDATING THEN -- Include any code specific for when the trigger is fired from an UPDATE. WHEN DELETING THEN -- Include any code specific for when the trigger is fired from a DELETE. DML triggers have four basic timing points for a single table. With the exception of Compound Triggers, the triggers for the individual timing points are self contained and can't automatically share state or variable information.
If trigger activated, implicitly fire DML statement and if trigger deactivated can't fire.If there is any type mismatch, variable assignments and comparisons may not work the way you expect.To be safe, instead of hard coding the type of a variable, you should use the This program has no effect when run, because there are no changes to the database.The workaround for this is to use variables defined in packages to store information that must be in scope for all timing points.The following code demonstrates the order in which the timing points are fired.
If no WHEN clause is supplied, the SQL statements are executed every time the trigger fires.