Benefits of Stored Procedures in SQL

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Questions and Answers

What is the purpose of the 'SET NOCOUNT ON' statement in a stored procedure?

To display the count of rows affected by the procedure

To pause the execution of the procedure

To suppress the message indicating the count of rows affected by the procedure (correct)

To enable the count of rows affected by the procedure

What is the advantage of using a stored procedure in SQL?

It enables reusability of SQL statements (correct)

It reduces the reusability of SQL statements

It increases the complexity of the database

It decreases the security of the database

What happens when you execute a stored procedure with default parameters without passing any value?

It returns all records from the database

It ignores the default value and waits for input

It takes the default parameter value (correct)

It throws an error

What is the purpose of the 'EXEC' statement in SQL?

To execute a stored procedure Signup and view all the answers

What is a stored procedure in SQL?

A group of SQL statements that are stored together in a database Signup and view all the answers

What happens when you execute a stored procedure with a parameter value that is different from the default value?

It ignores the default value and takes the provided value Signup and view all the answers

Why are stored procedures reusable?

Because they can be executed multiple times with different parameters Signup and view all the answers

What is the benefit of using stored procedures with parameters?

They make the procedure more flexible and reusable Signup and view all the answers

What is one of the benefits of using stored procedures in SQL?

They can be reused by multiple users and applications. Signup and view all the answers

What is the purpose of the ALTER TABLE command in relation to stored procedures?

To modify an existing stored procedure. Signup and view all the answers

What is one way that stored procedures can enhance security in an application or database?

By restricting users from direct access to the table. Signup and view all the answers

What is the result of passing the procedure name instead of the whole query in a stored procedure?

Reduced network traffic. Signup and view all the answers

What happens when a stored procedure is executed for the first time?

A plan for the stored procedure is created and stored in the buffer pool. Signup and view all the answers

What is the purpose of the IN parameter in a stored procedure?

To receive input value from the program. Signup and view all the answers

What is the purpose of the OUT parameter in a stored procedure?

To send output value to the program. Signup and view all the answers

What is the purpose of the IN OUT parameter in a stored procedure?

To receive input value from the program and send output value to the program. Signup and view all the answers

Study Notes

Benefits of Using a Stored Procedure in SQL

Stored procedures are reusable, allowing multiple users and applications to use them by simply calling the procedure.
Easy to modify, as changes can be made quickly using the ALTER TABLE command.
Enhance security by restricting direct access to tables and allowing only authorized access.
Reduce network traffic, as only the procedure name is passed instead of the entire query.
Improve performance, as the plan for the stored procedure is created and stored in the buffer pool for quick execution.

Creating a Simple Stored Procedure in SQL

The syntax for creating a stored procedure in SQL is: CREATE or REPLACE PROCEDURE name(parameters) AS variables; BEGIN; //statements; END;
Parameters can be IN (receive input values), OUT (send output values), or IN OUT (receive and send values).

Creating a Stored Procedure with Parameters

Example: CREATE PROCEDURE GetCarDesc_Para (@CID INT) AS BEGIN SET NOCOUNT ON SELECT C.CarID, C.CarName, CD.CarDescription FROM Car C INNER JOIN CarDescription CD ON C.CarID = CD.CarID WHERE C.CarID = @CID END
Execute the procedure using EXEC GetCarDesc_Para 201;

Creating a Stored Procedure with Default Parameters

Example: CREATE PROCEDURE GetCarDesc_DefPara (@CID INT = 301) AS BEGIN SET NOCOUNT ON SELECT C.CarID, C.CarName, CD.CarDescription FROM Car C INNER JOIN CarDescription CD ON C.CarID = CD.CarID WHERE C.CarID = @CID END
Execute the procedure with or without passing an argument, and it will take the default value or the passed value accordingly.

Stored Procedures in SQL

A stored procedure is a group of SQL statements stored together in a database.
It can perform one or multiple DML operations on the database and return values based on the statements and parameters passed.
Enables reusability by allowing multiple users to pass the same statements multiple times.