IT Career Guides & Free Resources
Expert roadmaps, tutorials, salary guides and interview prep across Data Science, Generative AI, Python, Cloud & Analytics — written by GloryTecks trainers in Hyderabad.
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Power BI Data Refresh: Scheduled and Incremental
Power BI data refresh explained: scheduled refresh limits and time-outs by capacity, gateways and connections, failure and inactivity notifications, incremental refresh with RangeStart and RangeEnd, how few rows it touches on real data, the boundary mistake that loaded 14,423 extra rows, and reliable refresh practices.
Window Functions in SQL for Data Engineers
The window function patterns data engineers use every week, each run on the real Chinook database: ROW_NUMBER for the latest row per key, RANK and DENSE_RANK on ties, LAG for gaps between events, frames for running totals and moving averages, and the default RANGE frame that silently changes a running total.
Data Warehouse Interview Questions and Answers
Data warehouse interviews ask how the platform behaves, not just what terms mean. Six questions answered on millions of real New York taxi trips: why columnar files are smaller, how partition pruning skips data, why reloads duplicate rows, what schema drift looks like, where stray rows go, and when to summarise.
Incremental Data Loading in Azure Data Factory
Incremental loading copies only what changed since the last run. This guide explains the four approaches Azure Data Factory documents, builds the watermark pattern step by step, runs it on a real table to show what it catches and what it silently misses, and says when to use change tracking, dated folders or windows.
Statistics Interview Questions for Data Science
Statistics questions in data science interviews test judgement more than formulas. Eight common questions are worked here on 12,330 real online shopping sessions: skewed averages, standard error, p-values two ways, a bootstrap interval, a confounder in a weekend effect, multiple testing, outliers and sample size.
Azure Data Engineer Certification (DP-203) Guide
Exam DP-203 and the Azure Data Engineer Associate certification were retired on 31 March 2025. This guide explains what that means for people who hold it or were studying for it, what the exam covered, how the Fabric Data Engineer Associate exam DP-700 differs, and how to plan your preparation now.