SQL Differences between stored procedure and triggers

Question

I\'m having trouble understanding the difference between a stored procedure and a trigger in sql. If someone could be kind enough to explain it to me that would be great.

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Answer 1

If you are familiar with JavaScript, a trigger is an addEventListener and Stored Procedure is a callback.

Answer 2

Both are database objects containing blocks lof code that can be used for implementing business logic

The differences are:

1) Triggers fire automatically but they need events for that. (Example: create,alter,drop,insert,delete,update) .

2) Procedures have to be explicitly called and then executed. They do not need create,alter,drop,insert,delete,update. we can also execute procedures automatically using the sp_procoption.

3) we cannot pass parameters inside the triggers,

but we can pass parameters inside stored procedures

example: if we want to display a message "error"

using a trigger: we need some DDL/DML Statement using a procedure: NO DDL/DML is needed

Answer 3

A stored procedure can be called form another stored procedure but not ab trigger. A stored procedure can be executed whenever a user wants but not a trigger.A trigger is fired only when events occur. A stored procedure can have a print statement,multiple parameters and return values but not a trigger. A stored procedure can be called from front end but not trigger.

Answer 4

A stored procedure is a user defined piece of code written in the local version of PL/SQL, which may return a value (making it a function) that is invoked by calling it explicitly.

A trigger is a stored procedure that runs automatically when various events happen (eg update, insert, delete).

IMHO stored procedures are to be avoided unless absolutely required.

Answer 5

Difference Between a Stored Procedure and a Trigger

We can define a trigger as a database object just like a stored procedure, or we can say it is a special kind of stored procedure which fires when an event occurs in a database. We can execute a SQL query that will "do something" in a database when an event is fired.

    Triggers are fired implicitly while stored procedures are fired explicitly.

Answer 6

A trigger is a special kind of stored procedure. It is attached to a table and only triggers when an insert, update or delete occurs. Stored procedures are essential functions that you can create and reuse in the table.