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Learn IBM DB2 — From Basics to Advanced

IBM DB2 is the relational database that powers banks, insurance, airlines, and government systems worldwide. This free interactive tutorial takes you from your first DB2 connection through to stored procedures, triggers, performance tuning, and certification-style interview questions.

The track is organised into 4 sections and 16 topics. Use the sidebar to jump in, or follow the chapters in order from DB2 Basics through to the DB2 Cheat Sheet. Every topic includes worked examples on the DB2 SAMPLE schema, hands-on practice exercises, and a quick quiz with collapsible answers.

What you'll learn in this IBM DB2 tutorial

  • Connecting and running queries from the DB2 CLP and Docker
  • DB2 data types — numeric, string, date, XML, BLOB
  • CRUD operations including DB2's MERGE upsert syntax
  • Constraints, joins, functions, views, and indexes
  • SQL PL procedures, triggers, cursors, and transactions
  • Reading EXPLAIN plans and tuning query performance

Common use cases

Enterprise transactional workloads

DB2 powers high-throughput OLTP systems in banking, insurance and airlines where availability, ACID guarantees and audit trails matter more than raw cost. Its mature row-store engine handles tens of thousands of concurrent transactions per second.

Hybrid SQL + XML / JSON workloads

DB2 has first-class native XML storage (pureXML) and JSON support, so applications that mix structured and semi-structured data can store both in the same database and query across them with SQL.

Migration from older mainframe systems

For organisations modernising from DB2 for z/OS or earlier IBM platforms, DB2 LUW provides a relatively low-friction path because SQL dialect and tooling are largely compatible.

Frequently asked questions

How is IBM DB2 different from Oracle and PostgreSQL?
DB2 is closer to Oracle in syntax — it supports MERGE, recursive CTEs, window functions, sequences and stored procedures with a similar feature set. Compared to PostgreSQL, DB2 is a commercial product with strong mainframe heritage and enterprise tooling, while PostgreSQL is open-source with a more permissive licensing model.
Do I need an IBM licence to learn DB2?
No. IBM offers DB2 Community Edition for free — sufficient for everything in this tutorial. You can also run DB2 in a Docker container in under five minutes, which is the easiest setup for learning.
Is DB2 still relevant in 2026?
Yes, for specific markets. DB2 remains widely deployed in banking, government and large enterprises with heavy mainframe footprints. Learning DB2 SQL is valuable if you target these sectors or work as a contractor on legacy modernisation projects.
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