The Library · Insights
Deep dives across data, automation & AI
109 in-depth articles — from Excel foundations to production machine learning. Filter by topic or difficulty to find exactly what you need.
Power QueryPractitioner
Automating Incremental Data Refreshes in Power Query with Persistent State and Change Tracking
Full refreshes at scale are a performance disaster — but Power Query gives you the tools to build watermark-based incremental pipelines that only process what's actually changed. This lesson walks through the complete architecture: persistent state, upsert merging, late-arrival handling, and failure recovery.
22 min read
Power QueryFoundation
Advanced M: Iterators, Accumulators, and Recursive Patterns
Master Power Query's most powerful patterns for complex data transformations. Learn List.Generate, List.Accumulate, and recursive functions to solve problems that standard operations can't handle.
13 min read
Power QueryExpert
Building a Reusable Function Library in Power Query
Master advanced M language patterns to create maintainable, performance-optimized function libraries that transform how your team works with Power Query across projects.
30 min read
Power QueryPractitioner
M Language Performance Patterns and Anti-Patterns: Optimize Power Query for Speed
Master the performance patterns that make M Language queries blazingly fast and eliminate the anti-patterns that kill query folding. Learn memory management, join optimization, and debugging techniques for production-ready Power Query solutions.
15 min read
Power QueryFoundation
Working with JSON and XML Data Sources in M: Complete Foundation Guide
Master Power Query's M language functions for parsing and transforming JSON and XML data into analysis-ready tables. Learn practical techniques for handling nested structures, missing fields, and common data quality issues.
13 min read
Power QueryExpert
Advanced JSON and XML Processing in Power Query M Language
Master sophisticated techniques for processing semi-structured data in M, including recursive navigation, namespace handling, performance optimization, and building resilient transformation pipelines for production systems.
27 min read
Power QueryFoundation
Dynamic Queries with M: Build Flexible, Reusable Transformations
Learn to create Power Query transformations that adapt based on parameters, building reusable data processing engines that scale across different scenarios and requirements.
14 min read
Power QueryExpert
Error Handling and Try-Otherwise Patterns in M: Building Production-Ready Power Query Solutions
Master advanced error handling in M language with comprehensive strategies for building robust, production-grade Power Query solutions that gracefully handle failures and adapt to changing data conditions.
29 min read
Power QueryPractitioner
Advanced Table Operations: Group, Join, and Transform in M Language
Master sophisticated table manipulation in Power Query M including custom aggregations, complex joins, and dynamic transformations for professional data analysis workflows.
15 min read
Power QueryFoundation
List and Record Operations in M: Transform, Select, and Combine Data Structures
Master the fundamental list and record operations in Power Query's M language. Learn to transform nested data, select specific elements, and combine complex data structures with practical, real-world examples.
14 min read
Power QueryPractitioner
Writing Custom M Functions from Scratch in Power Query
Master the art of building reusable, production-ready M functions that transform how you work with Power Query. Learn advanced parameter handling, error management, and optimization techniques through practical examples.
13 min read
Power QueryFoundation
M Language Fundamentals: Syntax, Types, and Expressions for Power Query
Master the building blocks of M Language with practical examples. Learn syntax rules, data types, and expression construction to write powerful Power Query transformations.
12 min read