Oracle 1Z1-171 real exam prep : Oracle Database 23ai SQL Associate

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Oracle 1Z1-171 Exam Syllabus Topics:

Oracle Database 23ai SQL Associate Sample Questions:

1. What is the purpose of the MERGE statement in SQL?

A) To update existing rows or insert new rows in a target table
B) To join two tables into one
C) To combine the results of two queries
D) To delete duplicate rows from a table

2. What does a Cartesian product in SQL result from?

A) An OUTER JOIN with NULL values
B) A NATURAL JOIN without specifying join conditions
C) An INNER JOIN without specifying join conditions

3. Which of the following is a valid reason to create a synonym?

A) To improve query performance
B) To enforce unique constraints on a table
C) To automatically generate numeric values for a column
D) To provide simplified and consistent access to an object

4. How are NULL values treated in relational databases?

A) NULL values are treated as empty strings.
B) NULL values are treated as zero.
C) NULL values represent missing or unknown data.
D) NULL values are not allowed in relational databases.

5. What does the following SQL query do?
SELECT * FROM employees WHERE salary > 5000 ORDER BY department_id;

A) Retrieves all employees with a salary greater than 5000, sorted by department ID in ascending order
B) Retrieves all employees with a salary greater than 5000, sorted by salary in ascending order
C) Retrieves all employees, sorted by department ID
D) Retrieves employees with salary less than 5000, sorted by department ID

Solutions: