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

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Question 36/139

Which three statements are true about single-row functions?

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

B. They can be nested to any level.

C. They return a single result row per table.

D. They can accept only one argument.

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

F. They can be used only in the WHERE clause of a SELECT statement.

Correct Answer: A,B,E

Single-row functions in SQL return one result per row, and the following statements are true:
* A: The data type of the returned value can indeed be different from the data type of the argument provided to the function. For example, the TO_CHAR function can take a numeric input and return a character string.
* B: Single-row functions can be nested within each other to any level that is supported by Oracle. This means you can have a function call as an argument to another function, and so on.
* E: The argument to a single-row function can be a column name, a variable, a literal, or an expression.
This flexibility allows these functions to be very powerful in SQL expressions.
The incorrect options are:
* C: Single-row functions do not return a single result row per table; they return a result for each row that is processed.
* D: They are not limited to accepting only one argument. Some functions, like NVL, accept multiple arguments.
* F: They are not limited to use in the WHERE clause; single-row functions can be used in any part of a
* SQL statement, including SELECT and ORDER BY clauses.
References:
* Oracle Documentation on Single-Row Functions: SQL Functions

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