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Oracle Database 23ai SQL Associate Sample Questions:

1. What will the following query do?
SELECT employee_id, salary
FROM employees
WHERE salary > (SELECT AVG(salary) FROM employees);

A) Return employees with a salary equal to the average salary
B) Return employees with a salary above the average salary
C) Return all employees and their salaries
D) Return employees with a salary below the average salary

2. The column data type is converted to a primary key.

A) CREATE ALIAS
B) CREATE SYNONYM
C) CREATE INDEX
D) CREATE SEQUENCE

3. Which of the following can be achieved using a correlated subquery?

A) Comparing each employee's salary to the average salary of their department
B) Joining two tables without a common column
C) Inserting data into a table
D) Retrieving duplicate records from a single table

4. Which SQL function converts a string representation of a date into a date data type?

A) TO_DATE
B) DATE_CONVERT
C) CONVERT_TO_DATE
D) CAST_TO_DATE

5. How are NULL values treated in relational databases?

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

Solutions: