ORACLE DATABASE INTERVIEW QUESTIONS

What are the basic logical operators used in Oracle SQL, and how do they function?

How does the AND logical operator work in Oracle SQL?

Explain the use of the OR logical operator in Oracle SQL with an example.

What happens when you combine AND and OR operators in the same Oracle SQL query?

How does the NOT logical operator work in Oracle SQL, and when would you use it?

Can you explain the difference between using NOT and using <> in Oracle SQL?

In Oracle SQL, what is the result of combining logical operators with NULL values, and how should it be handled?

Explain how to optimize complex queries using logical operators in Oracle SQL.

How would you troubleshoot a query that uses multiple logical operators but returns incorrect results in Oracle SQL?

During an Oracle certification exam, you are asked to write a query that retrieves employees who either earn more than 10000 or work in department 20, but excludes those who are in department 30. How would you structure this query using logical operators?