1Z0-829 Utilizing Java Object-Oriented Approach Practice Question
This 1Z0-829 practice question tests your understanding of utilizing java object-oriented approach. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Exhibit
Refer to the exhibit.
```
-- Creating a PL/SQL function
CREATE OR REPLACE FUNCTION get_emp_name (p_emp_id NUMBER) RETURN VARCHAR2 IS
v_name employees.last_name%TYPE;
BEGIN
SELECT last_name INTO v_name FROM employees WHERE employee_id = p_emp_id;
RETURN v_name;
END;
```
Given the exhibit, which statement about calling this function in a SELECT statement is true?
Refer to the exhibit.
```
-- Creating a PL/SQL function
CREATE OR REPLACE FUNCTION get_emp_name (p_emp_id NUMBER) RETURN VARCHAR2 IS
v_name employees.last_name%TYPE;
BEGIN
SELECT last_name INTO v_name FROM employees WHERE employee_id = p_emp_id;
RETURN v_name;
END;
```
A
It must be called using the `CALL` statement.
Why wrong: Functions can be used in expressions; CALL is for procedures.
B
It can only be called from a PL/SQL block, not from SQL.
Why wrong: Functions without side effects can be called from SQL.
C
It can be called as `SELECT get_emp_name(101) FROM dual;`
A function that reads data can be called in SELECT.
D
It cannot be used in a SELECT because it contains a SELECT statement.
Why wrong: It can, as long as it does not perform DML; SELECT inside a function is allowed.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It can be called as `SELECT get_emp_name(101) FROM dual;`
Option C is correct because a function that does not modify database state (i.e., is not a transactional or DML operation) and returns a value can be invoked directly in a SQL SELECT statement. The function `get_emp_name` appears to be a stored function that returns an employee name based on an ID, and calling it as `SELECT get_emp_name(101) FROM dual;` is valid in Oracle SQL, provided the function is defined with sufficient purity levels (e.g., WNDS, WNPS) to be used in SQL context.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
It must be called using the `CALL` statement.
Why it's wrong here
Functions can be used in expressions; CALL is for procedures.
✗
It can only be called from a PL/SQL block, not from SQL.
Why it's wrong here
Functions without side effects can be called from SQL.
✓
It can be called as `SELECT get_emp_name(101) FROM dual;`
Why this is correct
A function that reads data can be called in SELECT.
Related concept
Read the scenario before looking for a memorised answer.
✗
It cannot be used in a SELECT because it contains a SELECT statement.
Why it's wrong here
It can, as long as it does not perform DML; SELECT inside a function is allowed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Oracle often tests the misconception that any function containing a SELECT statement cannot be used in SQL, but the actual restriction is about modifying database state (DML), not reading data.
Detailed technical explanation
How to think about this question
In Oracle, for a function to be callable in a SQL statement, it must be defined with the `PRAGMA RESTRICT_REFERENCES` (or in newer versions, the function must be deterministic and not violate read/write consistency). The function must not write to the database (WNDS) and must not read or write package state (WNPS, RNPS, RNDS) unless explicitly allowed. This ensures that SQL queries remain side-effect-free and predictable. A real-world scenario is using a function to format or transform column values in a SELECT list, which is common in reporting queries.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Utilizing Java Object-Oriented Approach — This question tests Utilizing Java Object-Oriented Approach — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: It can be called as `SELECT get_emp_name(101) FROM dual;` — Option C is correct because a function that does not modify database state (i.e., is not a transactional or DML operation) and returns a value can be invoked directly in a SQL SELECT statement. The function `get_emp_name` appears to be a stored function that returns an employee name based on an ID, and calling it as `SELECT get_emp_name(101) FROM dual;` is valid in Oracle SQL, provided the function is defined with sufficient purity levels (e.g., WNDS, WNPS) to be used in SQL context.
What should I do if I get this 1Z0-829 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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