1z0-071 Exam Dumps | Which three statements are true about single row functions?

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Question 21/139

Which three statements are true about single row functions?

A. They can be used only in the where clause of a select statement.

B. They can accept only one argument.

C. They return a single result row per table.

D. The argument can be a column name, variable, literal or an expression.

E. They can be nested to any level.

F. The date type returned can be different from the data type of the argument.

Correct Answer: D,E,F

Single-row functions in SQL operate on each row independently and can modify the returned value:
* Option A: Incorrect. Single row functions can be used in multiple parts of a SELECT statement, including SELECT, WHERE, and ORDER BY clauses.
* Option B: Incorrect. Single row functions can accept more than one argument, such as the CONCAT function, which can accept multiple string arguments.
* Option C: Incorrect. They return one result for each row processed, not per table.
* Option D: Correct. Single row functions can take various types of arguments including column names, literals, variables, and other expressions.
* Option E: Correct. Functions can be nested within other functions, allowing complex expressions and calculations.
* Option F: Correct. The data type of the result can differ from the arguments' data types, such as the SUBSTR function returning a VARCHAR2 even when used on a number after converting it to a string.

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