Free 1Z0-071 Using Conversation Functions Questions and Answers

Question 1

Which two are SQL features?

Accepted Answer

providing database transaction control

Answer

SQL (Structured Query Language) provides robust capabilities for managing database transactions, allowing users to commit or roll back changes to maintain data integrity. Additionally, SQL is designed to process sets of data, meaning it operates on entire groups of rows rather than individual records, which makes it highly efficient for database operations. These are core features distinguishing SQL from other programming languages.

Question 2

Which two queries return rows for employees whose manager works in a different department?

Accepted Answer

SELECT emp. *
FROM employees emp
RIGHT JOIN employees mgr
ON emp.manager_ id = mgr. employee id
AND emp. department id <> mgr.department_ id
WHERE emp. employee_ id IS NOT NULL;

Answer

Both queries D and E correctly identify employees whose manager works in a different department. Query E uses an `INNER JOIN` on `manager_id = employee_id` and then filters for `emp.department_id <> mgr.department_id`, directly selecting matching pairs where departments differ. Query D uses a `RIGHT JOIN` and then filters `emp.employee_id IS NOT NULL` to ensure we're looking at actual employees, while also applying the department ID mismatch condition in the join, effectively achieving the same result by focusing on employees whose manager is found and is in a different department.

Question 3

Which statement executes successfully?

Accepted Answer

SELECT TO_CHAR(INTERVAL '800' SECOND, 'HH24:MM') FROM DUAL;

Answer

The `TO_CHAR` function is used to convert a value of a different data type (like `INTERVAL`, `DATE`, or `NUMBER`) into a character string. In this statement, `INTERVAL '800' SECOND` creates an interval value, and `TO_CHAR` can correctly format this interval into a string representation like 'HH24:MM' (hours and minutes). Other options attempt invalid conversions between `INTERVAL`, `DATE`, and `NUMBER` types directly.

Question 4

Which SQL function can be used to convert a string to a number?

Accepted Answer

TO_NUMBER

Answer

The `TO_NUMBER` function in SQL is specifically designed to convert a character string into a numeric data type. This is essential when you have numbers stored as text and need to perform mathematical operations or comparisons on them. It allows for explicit type conversion, often with an optional format model.

Question 5

What is the purpose of the TO_CHAR function in SQL?

Accepted Answer

To convert a number or date to a string.

Answer

The `TO_CHAR` function in SQL is primarily used to convert non-character data types, such as numbers or dates, into a character string. This is particularly useful for formatting output, allowing you to specify how dates or numbers should appear in a human-readable format. It enables flexible presentation of data from various types.

1Z0-071 - Oracle Database SQL Certified Associate Practice Test

1Z0-071 - Oracle Database SQL Certified Associate Practice Test

Free 1Z0-071 Using Conversation Functions Questions and Answers