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Oracle Database 23ai SQL Associate Sample Questions:

1. What is the difference between UNION and UNION ALL?

A) UNION includes all rows, while UNION ALL removes duplicates.
B) UNION combines columns, while UNION ALL combines rows.
C) UNION works with subqueries, while UNION ALL does not.
D) UNION removes duplicates, while UNION ALL includes all rows, including duplicates.

2. What will the following query return?
SELECT EXTRACT(YEAR FROM CURRENT_DATE) AS year FROM dual;

A) An error due to incorrect syntax
B) The full date in the session time zone
C) The current year in the database time zone

3. Which data dictionary view provides information about all tables accessible to the current user?

A) USER_TABLES
B) SESSION_TABLES
C) ALL_TABLES
D) DBA_TABLES

4. Which Oracle SQL function returns the current date and time, including time zone information?

A) CURRENT_DATE
B) CURRENT_TIMESTAMP
C) NOW
D) SYSDATE

5. What is the purpose of using external tables in Oracle Database?

A) To store backup copies of database tables
B) To improve the performance of complex queries
C) To create temporary tables for session-specific data
D) To manage data stored in external files using SQL

Solutions: