SQL STORED PROCEDURE Vs TRIGGER Statement
In this discussion, we will look at the Stored Procedure and Trigger functions, as well as the differences between them.
SQL STORED PROCEDURE Statement
The process is a programme unit that was built to accomplish a certain task and is kept in the database.
They are called anytime the SQL statement requires them. Procedures are similar to developer-specified user defined functions.
Procedures can be called or executed using the
It aids reusability of programming and saves time and lines of code.
It's similar to a java programme in that it can take some input as a parameter, process it, and return values.
SQL TRIGGER Statement
The trigger is similar to a procedure that runs automatically when a certain event occurs.
The trigger, like the process, does not need to be invoked directly.
Triggers are designed to carry out a task in reaction to the occurrence of a specific event.
The trigger can be triggered by DDL (
UPDATE) or DML (
UPDATE) statements, or by various database activities like below:
The trigger is made up of three parts, as detailed below:
Event:The occurrence of an incident that will cause the trigger to be executed is referred to as an event. The trigger can be set to run
AFTERan event happens.
Condition:It's a trigger feature that can be turned on or off. If the trigger is not given, it will be executed when the relevant event happens. If a condition is supplied, the trigger will be checked against the rules to see if it should be executed.
Action:The Action is a series of SQL statements that will be executed when the Trigger is run.
SQL Difference Between STORED PROCEDURE AND TRIGGER Statement
In below table we discuss the main distinguish in stored procedure and trigger function:-
|STORED PROCEDURE||TRIGGER FUNCTION|
|With the aid of the exec command, we can run a stored procedure whenever we wish.||A trigger can only be run when an event occurs on the table on which it is specified.|
|We can call a stored procedure from within another stored procedure.||Trigger nesting is only possible if an action (insert, delete, or update) described within an activate can trigger the execution of another trigger declared on the same or different table.|
|Stored procedures can be scheduled to run at a specific time using a job.||We are unable to arrange a trigger.|
|The input parameters can be passed to the stored procedure.||We can't use the arguments as a trigger input.|
|Stored procedures have the ability to return values.||Trigger is unable to return a value.|
|To debug a stored procedure, we can utilise the Print instructions inside it.||In a trigger, we can't utilise the print command.|
|Within a stored procedure, we can use transaction statements like begin transaction, commit transaction, and rollback.||Transaction statements aren't allowed inside a trigger.|
|We can use the front end to call a stored procedure (.asp files, .aspx files, .ascx files etc.)||A trigger executes without being called, whereas a stored procedure is called from another block.|
|A stored procedure can be called from a caller application or manually run.||When an event occurs, a trigger is triggered.|
|Stored procedures can be called from within a trigger.||A trigger cannot be called from a saved procedure.|
|Procedures are used to carry out tasks that the users have defined or specified.||Triggers are used to keep track of activity on the table in order to maintain referencial integrity.|