MS SQL Server - 32 - Local Variables MCQ

32 – Local Variables MCQ

Best of luck!

1 / 25

1. What is the primary purpose of local variables in SQL Server?

To store temporary data within a batch or procedure

To store global data

To store data across multiple sessions

To store data permanently in the database

2 / 25

2. In SQL Server, which keyword is used to declare a local variable?

VARIABLE

LOCAL

DECLARE

DEFINE

3 / 25

3. What is the maximum scope of a local variable in SQL Server?

Session-level

Global-level

Statement-level

Database-level

4 / 25

4. In SQL Server, what is the purpose of initializing a local variable?

To provide a name for the variable

To specify the data type of the variable

It is not necessary to initialize local variables.

To assign an initial value to the variable

5 / 25

5. Which data types can be used for local variables in SQL Server?

Only datetime data types

Only numeric data types

All data types supported by SQL Server

Only character data types

6 / 25

6. What is the scope of a local variable declared inside a stored procedure in SQL Server?

Procedure-level

Session-level

Global-level

Statement-level

7 / 25

7. In SQL Server, how can you assign a value to a local variable?

Using the SET statement

Both A and B

Local variables cannot store values

Using the SELECT statement

8 / 25

8. Which of the following is true about the lifetime of a local variable in SQL Server?

It exists as long as the database exists.

It is limited to the duration of the current batch or procedure.

It can be accessed by other users simultaneously.

It persists across multiple sessions.

9 / 25

9. In SQL Server, when should you use local variables instead of global variables?

When you need to store temporary data within a specific batch or procedure

When you need to share data across multiple sessions

When you need to define user-defined functions

When you need to store data permanently

10 / 25

10. Which SQL statement is used to declare a local variable in SQL Server?

DECLARE

SET

CREATE VARIABLE

LOCAL

11 / 25

11. What happens if you try to access a local variable outside of its scope in SQL Server?

The variable's value is automatically initialized to NULL.

An error is generated.

The variable is accessible but not modifiable.

The variable becomes global.

12 / 25

12. In SQL Server, which keyword is used to indicate the end of a local variable declaration?

DONE

None of the above

END

13 / 25

13. How do you declare a local variable with an initial value of 0 in SQL Server?

DECLARE @var INT

DECLARE @var INT = 0

DECLARE @var = 0

DECLARE @var INT DEFAULT 0

14 / 25

14. In SQL Server, what is the primary use of local variables within a batch or procedure?

To store temporary data for calculations or intermediate results

To share data across multiple sessions

To store data permanently in the database

To define user-defined functions

15 / 25

15. Which of the following statements is true about local variables in SQL Server?

They cannot be initialized with values.

They can be used to store data permanently.

They can be accessed from any session.

They have block-level scope.

16 / 25

16. In SQL Server, what is the primary purpose of local variables in a dynamic SQL statement?

To store temporary data for constructing the SQL statement

To store data permanently in the database

To define user-defined functions

To pass values into the dynamic SQL statement

17 / 25

17. In SQL Server, can you change the data type of a local variable after it is declared?

No, the data type is fixed at declaration.

Yes, at any time.

Only if the variable is declared as VARCHAR.

Yes, but only within the same batch.

18 / 25

18. In SQL Server, what is the primary difference between local and global variables?

Local variables can store data permanently, while global variables store temporary data.

Local variables are declared using DECLARE, while global variables use SET.

Local variables have session-level scope, while global variables have database-level scope.

Local variables are accessible from any session, while global variables are limited to the current session.

19 / 25

19. In SQL Server, which keyword is used to initialize a local variable with a default value?

DEFAULT

SET

INITIALIZE

None of the above

20 / 25

20. What is the primary purpose of using local variables within a stored procedure in SQL Server?

To store data permanently in the database

To store temporary data for processing within the procedure

To share data between different procedures

To improve performance by reducing data retrieval operations

21 / 25

21. In SQL Server, when are the values of local variables typically used within a stored procedure?

After the stored procedure has finished executing

During the declaration phase

Throughout the execution of the stored procedure

At the beginning of the stored procedure

22 / 25

22. Which of the following statements is true about local variables in SQL Server?

They are declared using the VAR keyword.

Their values are automatically persisted in the database.

They can be accessed from any stored procedure.

They have a database-level scope.

23 / 25

23. In SQL Server, what is the primary benefit of using local variables for calculations within a stored procedure?

Enhanced query optimization

Better error handling

Improved security

Reduced memory usage

24 / 25

24. In SQL Server, which data type is commonly used for local variables that store whole numbers?

DECIMAL

VARCHAR

INT

DATE

25 / 25

25. In SQL Server, what is the primary advantage of using local variables for data manipulation within a stored procedure?

Local variables can store data permanently.

Local variables reduce the need for repeated data retrieval operations.

Local variables have global scope.

Local variables improve query performance by avoiding table scans.

Your score is

MS SQL Server – 32 – Local Variables MCQ