ORACLE DATABASE INTERVIEW QUESTIONS

What is the purpose of the GROUP BY clause in SQL?

How do you use the GROUP BY clause with a single column in Oracle?

Can you use the GROUP BY clause without an aggregate function? Provide an example?

How do you use the GROUP BY clause with multiple columns in Oracle?

How do you use the HAVING clause with the GROUP BY clause in Oracle?

Can you use column aliases in the GROUP BY clause? Provide an example?

How do you handle NULL values in the GROUP BY clause in Oracle?

How do you use the GROUP BY clause with aggregate functions and additional columns in Oracle?

How do you optimize queries that use the GROUP BY clause in Oracle?

Explain a scenario where you need to use the GROUP BY clause and how you would implement it in Oracle.