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Oracle Database 23ai SQL Associate Sample Questions:

1. What does the INTERSECT operator do in SQL?

A) Returns rows that are present in both queries
B) Combines all rows from two queries without any conditions
C) Returns rows from the first query that are not present in the second query
D) Combines rows from two queries and includes all 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 with spaces in between
B) A syntax error
C) Only the first names of employees
D) Concatenated first and last names without spaces

3. What is the result of the following SQL query?
SELECT COALESCE(NULL, 100, 200) AS result FROM dual;

A) 100
B) NULL
C) 300
D) 200

4. Which INTERVAL data type would you use to store a period of time in years and months?

A) INTERVAL MINUTE TO HOUR
B) INTERVAL MONTH TO DAY
C) INTERVAL DAY TO SECOND
D) INTERVAL YEAR TO MONTH

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

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

Solutions: