How many types of triggers are there in SQL?
three typeSQL Server provides three type of triggers: Data manipulation language (DML) triggers which are invoked automatically in response to INSERT , UPDATE , and DELETE events against tables.
Data definition language (DDL) triggers which fire in response to CREATE , ALTER , and DROP statements..
Why use triggers in SQL?
Triggers help the database designer ensure certain actions, such as maintaining an audit file, are completed regardless of which program or user makes changes to the data. The programs are called triggers since an event, such as adding a record to a table, fires their execution.
What is trigger PL SQL?
In this chapter, we will discuss Triggers in PL/SQL. Triggers are stored programs, which are automatically executed or fired when some events occur. Triggers are, in fact, written to be executed in response to any of the following events − A database manipulation (DML) statement (DELETE, INSERT, or UPDATE)
How many types of triggers are there in Oracle?
five different typesTypes of Triggers There are five different types of Oracle Database triggers. Statement triggers are associated with a DML statement, such as DELETE , INSERT , or UPDATE , on a specified table or view.
What are the different types of triggers?
Types of TriggersData Manipulation Language (DML) Triggers. DML triggers are executed when a DML operation like INSERT, UPDATE OR DELETE is fired on a Table or View. … Data Definition Language (DDL) Triggers. … LOGON Triggers. … CLR Triggers.
What are triggers in Oracle?
Oracle allows you to define procedures that are implicitly executed when an INSERT, UPDATE, or DELETE statement is issued against the associated table. These procedures are called database triggers. … A trigger can include SQL and PL/SQL statements to execute as a unit and can invoke stored procedures.