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Oracle Database 23ai SQL Associate Sample Questions:

1. What does the UNION ALL operation do when selecting matching columns from different tables?
SELECT employee_id, salary FROM employees
UNION ALL
SELECT employee_id, bonus FROM bonuses;

A) Combines all employee IDs, salaries, and bonuses, including duplicates
B) Returns only employees with duplicate employee IDs in both tables
C) Returns only the employees with salaries and bonuses
D) Combines the salaries and bonuses for employees, removing duplicates

2. What will the following SQL statement output?
SELECT first_name || ' ' || last_name AS full_name FROM employees;

A) Concatenated first and last names without spaces
B) A syntax error
C) Only the first names of employees
D) Concatenated first and last names with spaces in between

3. Which SQL keyword is used to define a substitution variable in a SQL statement?

A) VAR
B) SUBSTITUTION
C) DEFINE
D) SET

4. Which of the following SQL commands retrieves data from a relational database?

A) UPDATE
B) INSERT
C) SELECT
D) DELETE

5. Which data dictionary view provides information about all tables accessible to the current user?

A) USER_TABLES
B) DBA_TABLES
C) ALL_TABLES
D) SESSION_TABLES

Solutions: