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Oracle Database 23ai SQL Associate Sample Questions:

1. What does the COMMIT statement do in SQL?

A) Discards all pending changes in the transaction
B) Rolls back changes to a previous state
C) Saves all pending changes to the database permanently
D) Begins a new transaction

2. What will the following query result in?
SELECT e.employee_id, e.manager_id
FROM employees e
WHERE e.manager_id IS NOT NULL;

A) Employees who do not have managers
B) Employees who have managers
C) Employees and their managers' IDs
D) All employees and their IDs

3. What is the relationship between SQL and a relational database?

A) SQL is a scripting language used for file manipulation.
B) SQL is used to create flat file databases.
C) SQL is a file system used to store relational database data.
D) SQL is a standard query language used to interact with relational databases

4. What is the difference between UNION and UNION ALL?

A) UNION includes all rows, while UNION ALL removes duplicates.
B) UNION combines columns, while UNION ALL combines rows.
C) UNION removes duplicates, while UNION ALL includes all rows, including duplicates.
D) UNION works with subqueries, while UNION ALL does not.

5. How are NULL values treated in relational databases?

A) NULL values represent missing or unknown data.
B) NULL values are treated as empty strings.
C) NULL values are treated as zero.
D) NULL values are not allowed in relational databases.

Solutions: