plsql Tutorial#20 trigger in oracle | DML Trigger |pl sql triggers in oracle database
In this pl sql trigger tutorial, we are going to learn a DML trigger in the oracle database.
What is trigger in the PLSQL database?
Triggers are stored programs, which are automatically executed
when some events (activity) occurs, event/activity can delete record,
update record creates table, login database etc.
Types of trigger
1) DML Triggers
Normal DML trigger
INSTEAD OF Triggers
2) DDL trigger
3) DATABASE operation Triggers
DML Triggers :
If any DELETE, INSERT, or UPDATE operation happen in database and you wanted
to automatically trigger/invoke some store program then it is called DML Triggers
DATABASE operation Triggers :
If any LOGON/LOGOFF/STARTUP/SHUTDOWN operation happen in database and you wanted to
automatically trigger/invoke some store program then it is called DDL Triggers
What DDL trigger :
If any CREATE, ALTER, or DROP operation happen in database and you wanted to automatically
trigger/invoke some store program then it is called DDL Triggers
INSTEAD OF CREATE Triggers :
When you issue a DML statement such as INSERT, UPDATE, or DELETE to a non-updatable view,
Oracle will issue an error
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