What is the difference between "Stored Procedure" and "Function"?

Definition of stored Procedure :

Prepared SQL code that you may save and reuse repeatedly is called a stored procedure. To avoid writing the same SQL query twice, consider saving it as a stored procedure that can be called whenever needed.

Syntax and example :

CREATE OR REPLACE PROCEDURE
<procedure_name>
   (
   <parameterl IN/OUT <datatype>
   )
[ IS | AS ]
   <declaration_part>
BEGIN
   <execution part>
EXCEPTION
   <exception handling part>
END;

CREATE PROCEDURE SelectAlldeveloper
AS
SELECT * FROM developer
GO;

Definition of Function :

Functions is a standalone PL/SQL subprogram. Like PL/SQL procedure, functions have create with unique name by which it can be referred. These are stored as PL/SQL database objects.
we can also analysis in PL/SQL , It contains various built-in functions to work with strings and date datatype. Here we are going to see the commonly used functions and their usage.

CREATE OR REPLACE FUNCTION
<procedure_name>
(
<parameterl IN/OUT <datatype>
)
RETURN <datatype>
[ IS | AS ]
<declaration_part>
BEGIN
<execution part>
EXCEPTION
<exception handling part>
END;

Below is point of difference between stored Procedure and Function

1. A procedure contain both input and output parameters, but a function can contain only
input parameters .
2. Inside a procedure we can use DML Data Manipulation Language (INSERT/UPDATE/DELETE) statements. But inside a function we can't use DML statements.
3. We can't utilize a Stored Procedure in a Select statement. But we can use a function
in a Select statement.
4. We can use a Try-Catch Block in a Stored Procedure but inside a function we can't
use a Try-Catch block for debuging purpose .
5. We can use transaction management in a procedure code but we can't in a function code.
6. We can't join a Stored Procedure for any use case but we can join functions.
7. Stored Procedures cannot be used in the SQL statements anywhere in the
WHERE/HAVING/SELECT section. But we can use a function anywhere in our Query.
8. A procedure code can return 0 or n values (max 1024). But a function code can return only 1
value that is mandatory .
9. A procedure can't be called from a function but we can able to call a function from a
procedure in Query.

Frequently asked questions (FAQ) in "Stored Procedure" and "Function"

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Conclusion:

In this article ,We can choice between a stored procedure and a function depends on the specific requirements of the task and both are important in SQL.
It's often a good practice to take a backup before performing such operations, especially in a production environment.
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