Databases

Real interview questions with expert answers, plain-English explanations, and practical examples. (3 questions)

Oracle Database Administrator Databases

How does a B-tree index actually speed up a query, and when does it stop helping?

Read answer →
Google Data Engineer Databases

What’s the difference between OLTP and OLAP, and how does that affect schema design?

Read answer →
Capgemini Backend Developer Databases

Explain database normalization, and when would you deliberately denormalize a production table?

Read answer →