A User-Defined Function (UDF) in SQL is a custom function written by users to return a value based on input parameters. UDFs help encapsulate logic, simplify queries, and improve code reusability in SQL programming.
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What is the key difference between a function and a stored procedure?
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Question 5 of 15
5. Question
Can a UDF modify database data (e.g., using INSERT/UPDATE)?
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Question 6 of 15
6. Question
Which clause specifies the return type in a UDF?
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Question 7 of 15
7. Question
What is a scalar function?
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Question 8 of 15
8. Question
What is an inline table-valued function?
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Question 9 of 15
9. Question
Can user-defined functions accept input parameters?
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Question 10 of 15
10. Question
Which of the following is not allowed inside a SQL function?
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Question 11 of 15
11. Question
Which SQL dialect supports UDFs?
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Question 12 of 15
12. Question
Can a UDF call another function?
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Question 13 of 15
13. Question
What is a multi-statement table-valued function (MSTVF)?
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Question 14 of 15
14. Question
How do you call a scalar UDF in a SELECT query?
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Question 15 of 15
15. Question
What happens if a UDF returns NULL?
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Summary
This quiz on User-Defined Functions in SQL covers scalar and table-valued functions, syntax, return types, usage, and limitations. It’s ideal for developers and analysts looking to modularise SQL logic and improve query structure.
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