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Oracle Database 23ai SQL Associate Sample Questions:

1. What type of join does the following query perform?
SELECT *
FROM employees e, departments d
WHERE e.department_id = d.department_id;

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

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

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

3. What is the primary purpose of an index in SQL?

A) To improve the performance of data retrieval queries
B) To ensure uniqueness of values in a column
C) To store metadata about a table
D) To enforce data integrity constraints

4. Which clause is used to ensure that only specific rows are deleted in a DELETE statement?

A) WHERE
B) SET
C) HAVING
D) FROM

5. What is the purpose of a correlated subquery?

A) A subquery that depends on the result of another subquery
B) A subquery that references columns from the outer query
C) A subquery that can be used only with aggregate functions
D) A subquery that combines data from multiple tables

Solutions: