MS SQL Server - 36 - User-Defined Functions MCQ

36 – User-Defined Functions MCQ

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1. What is a User-Defined Function (UDF) in SQL Server?

A trigger that fires automatically on data changes

A table used for data storage

A built-in function provided by SQL Server

A function defined by the user to perform specific tasks

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2. Which type of UDF in SQL Server returns a single scalar value?

Multi-Valued UDF

Scalar UDF

Table-Valued UDF

Inline UDF

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3. What is the primary purpose of a Scalar UDF in SQL Server?

To create custom error messages

To return a table

To declare local variables

To return a single scalar value

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4. Which type of UDF in SQL Server returns a table as its result?

Scalar UDF

Table-Valued UDF

Multi-Valued UDF

Inline UDF

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5. What is an Inline Table-Valued UDF in SQL Server?

A UDF that returns a single scalar value

A UDF defined using the CREATE PROCEDURE statement

A UDF that returns a table variable

A UDF defined using the CREATE FUNCTION statement

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6. In SQL Server, which type of UDF is optimized for performance and can be used in queries with JOINs and WHERE clauses?

Scalar UDF

Multi-Valued UDF

Inline UDF

Table-Valued UDF

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7. What is the primary advantage of using Multi-Valued UDFs in SQL Server?

They can be used in WHERE clauses.

They automatically fire on data changes.

They can return multiple result sets.

They return a single scalar value.

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8. Which SQL statement is used to create a Scalar UDF in SQL Server?

CREATE FUNCTION

CREATE PROCEDURE

CREATE TABLE

CREATE TRIGGER

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9. What is the primary use of the RETURNS keyword when defining a UDF in SQL Server?

To specify the UDF's name

To specify the UDF's return data type

To declare local variables

To execute the UDF

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10. In SQL Server, how can you execute a Scalar UDF?

By using the SELECT statement

By using the EXECUTE statement

By using the DECLARE statement

By using the PRINT statement

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11. What is the primary purpose of the TABLE keyword when defining a Table-Valued UDF in SQL Server?

To specify the UDF's name

To declare local variables

To define the structure of the table the UDF returns

To specify the UDF's return data type

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12. In SQL Server, which type of UDF is defined using a single SELECT statement?

Multi-Valued UDF

Scalar UDF

Inline UDF

Table-Valued UDF

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13. How can you execute a Table-Valued UDF in SQL Server?

By using the DECLARE statement

By using the SELECT statement with a CROSS APPLY or OUTER APPLY

By using the PRINT statement

By using the EXECUTE statement

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14. What is the primary advantage of using Table-Valued UDFs in SQL Server?

They can return multiple rows as a table.

They can be used in WHERE clauses.

They return a single scalar value.

They automatically fire on data changes.

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15. How can you execute a Multi-Valued UDF in SQL Server?

By using the PRINT statement

By using the SELECT statement with a CROSS APPLY or OUTER APPLY

By using the EXECUTE statement

By using the DECLARE statement

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16. What is the primary purpose of the ALTER FUNCTION statement in SQL Server?

To modify the structure of an existing UDF

To create a new UDF

To execute a UDF

To declare local variables

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17. In SQL Server, can you change the return data type of an existing Scalar UDF using the ALTER FUNCTION statement?

Only if the UDF is dropped and recreated.

Yes, it is possible.

Only if the UDF is recompiled.

No, it is not possible.

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18. What is the primary purpose of the DROP FUNCTION statement in SQL Server?

To declare local variables

To create a new UDF

To execute a UDF

To remove an existing UDF from the database

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19. In SQL Server, can you change the structure of an existing Table-Valued UDF using the ALTER FUNCTION statement?

No, it is not possible.

Only if the UDF is dropped and recreated.

Only if the UDF is recompiled.

Yes, it is possible.

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20. What is the primary purpose of the WITH SCHEMABINDING option when creating a UDF in SQL Server?

To specify the UDF's name

To create a schema for the UDF

To prevent changes to underlying objects that the UDF depends on

To specify the UDF's return data type

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21. In SQL Server, what happens when you use the WITH ENCRYPTION option when creating a UDF?

The UDF is automatically encrypted for security.

The UDF cannot be used in queries.

The UDF is hidden and its code cannot be viewed.

The UDF's return data type is encrypted.

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22. What is the purpose of the NOEXEC option when creating or altering a UDF in SQL Server?

To prevent the UDF from executing

To specify the return data type of the UDF

To create a schema for the UDF

To automatically encrypt the UDF

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23. In SQL Server, which statement can be used to view the definition of an existing UDF?

sp_helptext system procedure

PRINT statement

EXECUTE statement

SELECT statement

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24. What is the purpose of the ENCRYPTION option when creating a UDF in SQL Server?

To create a schema for the UDF

To prevent changes to underlying objects that the UDF depends on

To automatically encrypt the UDF for security

To specify the UDF's name

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25. In SQL Server, how can you change the body of an existing UDF using the ALTER FUNCTION statement?

By using the CREATE FUNCTION statement

By using the ALTER FUNCTION statement with the AS keyword

By using the PRINT statement

By using the SELECT statement

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MS SQL Server – 36 – User-Defined Functions MCQ