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A working handbook for data and software engineering.
Hands-on tutorials by Alex Merced on Apache Iceberg, the data lakehouse, pipelines, agentic AI, and the languages and tools that hold it all together.
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Latest tutorials
Page 71 of 133- 01How to Build a Semantic Layer: A Step-by-Step GuideMost teams start building a semantic layer the wrong way: they open their BI tool, create a few calculated fields, and call it done. Six months later, three ...Semantic LayerFeb 19, 2026
- 02Semantic Layer vs. Metrics Layer: What's the Difference?Both terms appear in every modern data architecture diagram. They're used interchangeably in conference talks, Slack threads, and vendor marketing. And almos...Semantic LayerFeb 19, 2026
- 03Semantic Layer vs. Data Catalog: Complementary, Not CompetingWe already have a data catalog, so we don't need a semantic layer. This is one of the most common misconceptions in modern data architecture.Semantic LayerFeb 19, 2026
- 04Slowly Changing Dimensions: Types 1-3 with ExamplesDimensions change. A customer moves cities. A product gets reclassified. An employee changes departments. How your data model handles these changes determine...Data ModelingFeb 19, 2026
- 05Why Your AI Initiatives Fail Without a Semantic LayerYour team builds an AI agent. It connects to your data warehouse. A product manager types What was revenue last quarter? and gets a number. The number is wrong.Semantic LayerFeb 19, 2026
- 06The Role of the Semantic Layer in Data GovernanceMost organizations have a data governance policy. It lives in a Confluence page. It defines who owns what data, what terms mean, and who should have access. ...Semantic LayerFeb 19, 2026