Design for correctness before writing reports
College Management Database
Model departments, students, courses, semesters and enrollments while preventing duplicate registrations and invalid academic values.
- 3NF academic schema
- Transcript and performance reports
- Composite keys and indexes
Placement Management System
Derive eligibility, track drive stages, audit status changes and calculate transparent recruitment funnels.
- Eligibility query
- Transactional stage updates
- Conditional aggregation
Library Database
Separate titles from physical copies, protect active loans and make issue/return operations consistent.
- Partial unique index
- Loan lifecycle triggers
- Availability and overdue reports
Every schema must defend its data
1. Discover
State actors, events, rules and questions.
2. Normalize
Separate facts and remove update anomalies.
3. Protect
Use keys, checks, foreign keys and transactions.
4. Explain
Test reports and justify each useful index.
Original teaching scenarios with standard SQL acknowledged
The scenarios, schema choices, explanations, traces, test cases and questions were written for CodeBhavya. SQL, relational theory, normalization terminology and SQLite are established technologies, not CodeBhavya inventions. The executable scripts target SQLite 3 and use clearly identified SQLite features such as partial indexes and julianday().