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Oracle Database 23ai SQL Associate Sample Questions:

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

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

2. What does the INTERSECT operator do in SQL?

A) Returns rows that are present in both queries
B) Returns rows from the first query that are not present in the second query
C) Combines rows from two queries and includes all duplicates
D) Combines all rows from two queries without any conditions

3. Which function is used to extract the year from a date in SQL?

A) TO_YEAR(date)
B) YEAR(date)
C) GET_YEAR(date)
D) EXTRACT(YEAR FROM date)

4. What will the following query do?
DELETE FROM employees
WHERE department_id = 20;

A) Delete all rows in the employees table
B) Raise an error because DELETE cannot use a WHERE clause
C) Delete all rows where department_id is 20
D) Delete the department_id column in the employees table

5. Which of the following is a valid reason to create a synonym?

A) To enforce unique constraints on a table
B) To automatically generate numeric values for a column
C) To provide simplified and consistent access to an object
D) To improve query performance

Solutions: