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Oracle Database 23ai SQL Associate Sample Questions:

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

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

2. Which SQL function can be used to replace NULL values with a specified value?

A) ISNULL
B) NVL
C) COALESCE
D) REPLACE

3. What does the following SQL statement do?
ALTER TABLE employees DROP COLUMN salary;

A) Drops the salary column from the employees table
B) Sets the salary column to NULL for all rows
C) Deletes the employees table
D) Removes duplicate rows from the employees table

4. Which type of join retrieves only the rows with matching values in both tables?

A) OUTER JOIN
B) INNER JOIN
C) CROSS JOIN
D) NATURAL JOIN

5. What does the INTERSECT operator do in SQL?

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

Solutions: