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Oracle Database 23ai SQL Associate Sample Questions:

1. What does the following SQL query do?
SELECT * FROM employees WHERE salary > 5000 ORDER BY department_id;

A) Retrieves all employees, sorted by department ID
B) Retrieves all employees with a salary greater than 5000, sorted by department ID in ascending order
C) Retrieves all employees with a salary greater than 5000, sorted by salary in ascending order
D) Retrieves employees with salary less than 5000, sorted by department ID

2. What does the following query return?
SELECT ROUND(123.456, 1) AS rounded_value FROM dual;

A) 123.5
B) 123.45
C) 124
D) 123.4

3. What is required for the queries combined by a SET operator to work correctly?

A) The result sets must have the same number of columns and compatible data types.
B) Both queries must include the WHERE clause.
C) Both queries must use the GROUP BY clause.
D) The tables must be joined using a primary key.

4. What is the primary purpose of a primary key in a relational database?

A) To sort data in ascending order
B) To store duplicate data in a table
C) To establish relationships between tables
D) To uniquely identify each record in a table

5. Which operator can be used in a multiple-row subquery to match a single value to a list of values?

A) =
B) IN
C) NOT NULL
D) EXISTS

Solutions: