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As the name suggests these are the triggers which execute on DML events or say depend on DML statements such as Update, Insert or Delete.
Using DML trigger you can control the behavior of your DML statements.
You might omit this clause if you just want to record the fact that the operation occurred, but not examine the data for each row.
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.
Your package should include a counter variable to detect this situation.If a triggering statement omits a column list, the trigger is fired when any column of the associated table is updated.A column list cannot be specified for statement trigger is fired again.Before that a simple tip: Always remember to set your server output ON otherwise the output message returned from your trigger will not be displayed back to you.CREATE OR REPLACE TRIGGER bi_Superheroes BEFORE INSERT ON superheroes FOR EACH ROW ENABLE DECLARE v_user VARCHAR2 (15); BEGIN SELECT user INTO v_user FROM dual; DBMS_OUTPUT.
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PUT_LINE('You Just Inserted a Row Mr.'|| v_user); END; / On successfully compiling, this trigger will show you a string along with the user name who performed the “Insert” DML on superheroes table.