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Oracle Database 23ai SQL Associate Sample Questions:

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

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

2. Which of the following SET operators combines results from two queries and removes duplicates?

A) UNION
B) INTERSECT
C) UNION ALL
D) MINUS

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

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

4. In a relational database, what is a foreign key?

A) A temporary key generated during query execution
B) A key used to sort data in a specific order
C) A unique identifier for a record in a table
D) A key that is used to establish a relationship between two tables

5. Which INTERVAL data type would you use to store a period of time in years and months?

A) INTERVAL DAY TO SECOND
B) INTERVAL MONTH TO DAY
C) INTERVAL YEAR TO MONTH
D) INTERVAL MINUTE TO HOUR

Solutions: