1z0-071 Exam Dumps | Which two are true about scalar subquery expressions?

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Question 79/139

Which two are true about scalar subquery expressions?

A. You cannot correlate them with a table in the parent statement

B. You can use them as a default value for a column.

C. .You must enclose them in parentheses.

D. They can return at most one row.

E. They can return two columns.

Correct Answer: C,D

Scalar subquery expressions in Oracle SQL have specific rules:
* Option C: You must enclose them in parentheses.
* Scalar subqueries must be enclosed in parentheses. This is a requirement for syntax clarity and to distinguish the subquery from the rest of the SQL statement.
* Option D: They can return at most one row.
* Scalar subqueries are designed to return exactly one row containing one column. If a scalar subquery returns more than one row, Oracle will throw an error, ensuring that the subquery either returns a single value or no value (NULL).
Options A, B, and E are incorrect based on Oracle SQL functionalities:
* Option A is incorrect because scalar subqueries can indeed be correlated with the parent query.
* Option B is true but not in the context of default constraints for table columns in the CREATE TABLE statement.
* Option E is incorrect because scalar subqueries can only return a single column by definition.

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