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Oracle Database 23ai SQL Associate Sample Questions:

1. Which of the following best describes a relational database?

A) A database where all data is stored as key-value pairs
B) A database that uses a tabular structure with rows and columns to represent relationships between data entities
C) A database that organizes data hierarchically
D) A flat file system with no defined relationships between data

2. What is a SELF JOIN in SQL?

A) A join used for Cartesian products
B) A join between tables with identical structures
C) A join of a table with itself
D) A join that does not require a WHERE clause

3. Which SET operator returns rows from the first query that are not present in the second query?

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

4. Which type of join retrieves only the rows with matching values in both tables?

A) INNER JOIN
B) CROSS JOIN
C) NATURAL JOIN
D) OUTER JOIN

5. What does the EXISTS operator check in a subquery?

A) If the subquery returns any rows
B) If the subquery references the outer query
C) If the subquery returns a specific number of rows
D) If the subquery contains only unique values

Solutions: