📘 Database – Level 2 (Concepts & T-SQL)

Advanced SQL logic, control flow, and performance thinking for real systems

🗝️ About This Course

This is the twenty-first course in your programming journey, after:

1️⃣ Programming Foundations – Level 1
2️⃣ Algorithms & Problem Solving – Level 1
3️⃣ Introduction to Programming with C++ – Level 1
4️⃣ Algorithms & Problem Solving – Level 1 (Clean Code Solutions)
5️⃣ Algorithms & Problem Solving – Level 2
6️⃣ Introduction to Programming Using C++ – Level 2
7️⃣ Algorithms & Problem Solving – Level 3
8️⃣ Algorithms & Problem Solving – Level 4
9️⃣ Foundations – Level 2
🔟 OOP as it Should Be – Concepts
1️⃣1️⃣ OOP as it Should Be – Applications
1️⃣2️⃣ Data Structures – Level 1
1️⃣3️⃣ Algorithms & Problem Solving – Level 5
1️⃣4️⃣ C# – Level 1
1️⃣5️⃣ Database – Level 1 (SQL: Concepts & Practice)
1️⃣6️⃣ OOP as It Should Be in C#
1️⃣7️⃣ Database – SQL (Projects & Practice)
1️⃣8️⃣ C# & Database Connectivity (ADO.NET)
1️⃣9️⃣ Full Real Project – DVLD
2️⃣0️⃣ C# Programming – Level 2

At this point in the roadmap, you already:

🔹 Design databases correctly (ERD → relational schema)
🔹 Write solid SQL queries and joins with confidence
🔹 Apply normalization, constraints, and data integrity
🔹 Use ADO.NET to connect applications to databases
🔹 Build real systems and handle real data flows
🔹 Understand architecture, performance awareness, and clean code

Now it’s time to move SQL from querying to programming.

👉 This course takes you inside T-SQL — where logic, control flow, transactions, and performance live.

🔐 What Makes This Course Different?

🔹 Treats T-SQL as a programming language, not just query syntax
🔹 Teaches logic, flow control, and error handling inside the database
🔹 Focuses on correctness, safety, and performance
🔹 Explains when to use database logic and when not to
🔹 Builds skills required for enterprise and backend systems

This course fixes a common limitation:

👉 Knowing SELECTs and JOINs, but not knowing how databases think and execute logic.

📖 What You Will Learn?

By the end of this course, you will be able to:

🔹 Write procedural logic in T-SQL using:

▫️ Variables
▫️ IF / ELSE
▫️ CASE statements
▫️ WHILE loops and control blocks (BEGIN…END)

🔹 Handle errors and safety correctly:

▫️ TRY…CATCH
▫️ THROW and error functions
▫️ @@ERROR and @@ROWCOUNT

🔹 Control data consistency with:

▫️ Transactions (COMMIT / ROLLBACK)
▫️ Real banking-style examples

🔹 Work with temporary data:

▫️ Table variables
▫️ Temporary tables
▫️ When to use each correctly

🔹 Build reusable database logic using:

▫️ Stored Procedures (CRUD patterns)
▫️ Scalar functions
▫️ Inline and multi-statement table-valued functions

🔹 Use advanced querying features:

▫️ Window functions (ROW_NUMBER, RANK, DENSE_RANK, LAG, LEAD)
▫️ Paging with OFFSET / FETCH
▫️ CTEs (including recursive CTEs)

🔹 Implement database automation:

▫️ Triggers (AFTER / INSTEAD OF)
▫️ Inserted & Deleted tables

🔹 Understand security and safety:

▫️ Dynamic SQL and SQL Injection
▫️ Safer patterns and best practices

🔹 Begin performance-aware thinking:

▫️ Indexing basics
▫️ Execution plans
▫️ Query optimization concepts

🧱 How This Course Is Structured?

🔹 Starts with T-SQL fundamentals and control flow
🔹 Moves into error handling and transactions
🔹 Introduces reusable database components
🔹 Advances to window functions, CTEs, and triggers
🔹 Ends with performance, security, and best practices

📌 The goal is confidence and control, not memorization.

🧑‍💻 Who This Course Is For?

✅ Students who completed Database – Level 1 and SQL Projects & Practice
✅ Backend developers building serious systems
✅ Developers who want logic where it belongs — inside the database
✅ Data Analysts who need advanced SQL logic and window functions
✅ Data Scientists & AI engineers working with complex datasets and transformations
✅ Anyone aiming for enterprise-grade database skills

❌ Not for beginners or syntax-only learners

⚠️ What This Course Is NOT?

❌ Not a beginner SQL course
❌ Not a replacement for application logic
❌ Not about writing logic everywhere without design thinking

📌 This course teaches when and how to use T-SQL responsibly.

🎓 Certification & Learning Outcomes

Upon completion, you will earn a

Certificate in Database – Level 2 (Concepts & T-SQL), validating your ability to:

🔹 Write advanced T-SQL logic safely
🔹 Build reusable database components
🔹 Handle transactions and errors correctly
🔹 Apply performance-aware database design

🎓 Final Outcome

After completing this course, you will:

🔹 Treat SQL as a real programming skill
🔹 Write safer, faster, and smarter database logic
🔹 Understand how databases execute and optimize work
🔹 Be ready for enterprise databases, analytics, and backend systems

🧠 Level 1 taught you how to query data. Level 2 teaches you how databases actually think.