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Oracle Database 23ai SQL Associate Sample Questions:

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

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

2. Which SQL JOIN keyword retrieves all rows from both tables, including those without matches?

A) FULL OUTER JOIN
B) CROSS
C) RIGHT
D) LEFT

3. Which SQLPlus command displays defined substitution variable values?

A) SHOW
B) VERIFY
C) DEFINE
D) LIST

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

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

5. What does the following SQL statement do?
SELECT e.employee_id, d.department_name
FROM employees e
JOIN departments d ON e.department_id = d.department_id;

A) Retrieves employees and departments with matching department_id
B) Retrieves all employees and their departments
C) Retrieves only employees without departments
D) Retrieves only departments with no employees

Solutions: