When utilizing User-Defined Functions (UDFs) in SQL, which statement accurately describes their usage?

Question

Options

• AUDFs can't be invoked within Stored Procedures.
• BThey allow custom-defined operations on data, extending SQL functionalities.
• CUDFs are solely used for administrative tasks within databases.
• DUDFs are only applicable to numeric data types.

• B
  92% (24)
• C
  4% (1)
• D
  4% (1)

Explanation

Option B is correct because UDFs are designed specifically to encapsulate custom logic that extends what SQL can do natively - you can write functions that transform strings, perform complex calculations, or apply business rules, then call them just like built-in functions (e.g., SELECT my_func(column) FROM table).

Why the distractors are wrong:

• A is false - UDFs can absolutely be called inside stored procedures; they're reusable across all SQL contexts including procedures, views, and queries.
• C is false - UDFs operate on data, not on database administration (that's the domain of system commands and stored procedures with DDL/DCL statements).
• D is false - UDFs work with any data type: strings, dates, JSON, booleans, and more, not just numbers.

Memory tip: Think of UDF as "User-Defined Functionality" - the key word is custom. Whenever you see a question asking what UDFs fundamentally do, the answer always points to extending SQL with user-written logic, which maps directly to option B.

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