Databases Study Guide
Relational model, SQL, transactions, indexing, query optimization, and NoSQL paradigms.
Core topics in Databases
- Relational Model
- SQL
- Normalization
- Indexing
- Transactions and ACID
- Query Optimization
- NoSQL
- Distributed Databases
Why students struggle
Normalization theory is the conceptual sticking point — most students can apply rules but can't justify why. Query optimization adds a second layer where intuition often misleads.
How Fennie helps
Fennie generates query-optimization problems with EXPLAIN-plan analysis, training you to read what the database actually does.
How to study Databases
- 01Master joins before subqueries
- 02Practice normalization to 3NF on real schemas
- 03Use Fennie for SQL query problems with explanations
- 04Read execution plans on every slow query
Frequently asked questions
SQL or NoSQL first?
SQL — it's the foundation and the more interview-tested skill.
Do I need to memorize normal forms?
1NF through 3NF yes. BCNF and beyond rarely tested.
Does Fennie generate SQL problems?
Yes — including JOIN, subquery, window function, and optimization problems.
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