How do I create a trigger in PL SQL?

How do I create a trigger in PL SQL?

Creating a trigger:

1. CREATE [OR REPLACE ] TRIGGER trigger_name.
2. {BEFORE | AFTER | INSTEAD OF }
3. {INSERT [OR] | UPDATE [OR] | DELETE}
4. [OF col_name]
5. ON table_name.
6. [REFERENCING OLD AS o NEW AS n]
7. [FOR EACH ROW]
8. WHEN (condition)

What is trigger in Oracle PL SQL?

A trigger is like a stored procedure that Oracle Database invokes automatically whenever a specified event occurs. Note: The database can detect only system-defined events. You cannot define your own events.

What is the triggers in PL SQL explain with example?

A PL/SQL trigger is a named database object that encapsulates and defines a set of actions that are to be performed in response to an insert, update, or delete operation against a table. Triggers are created using the PL/SQL CREATE TRIGGER statement.

What Is syntax of trigger in SQL?

Syntax: create trigger [trigger_name] [before | after] {insert | update | delete} on [table_name] [for each row] [trigger_body] Explanation of syntax: create trigger [trigger_name]: Creates or replaces an existing trigger with the trigger_name. [before | after]: This specifies when the trigger will be executed.

What is trigger and its syntax?

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) A database definition (DDL) statement (CREATE, ALTER, or DROP).

What are the types of trigger in PL SQL?

Answer: There are two types of triggers in PL/SQL. They are Row-level trigger and Statement-level trigger.

What is trigger syntax in SQL?

A trigger is a special type of stored procedure that automatically runs when an event occurs in the database server. DML triggers run when a user tries to modify data through a data manipulation language (DML) event. DML events are INSERT, UPDATE, or DELETE statements on a table or view.

What is the trigger write syntax of trigger and explain types of triggers?

Before Statement Trigger: Trigger fire only once for each statement before the triggering DML statement. Before Row Trigger : Trigger fire for each and every record before the triggering DML statement. After Statement Trigger: Trigger fire only once for each statement after the triggering DML statement executing.