https://sudonull.com/replacingmergetree-in-clickhouse-complete-guide
Learn how ReplacingMergeTree removes duplicates, works with versions and FINAL. Examples, pitfalls, and comparison with CollapsingMergeTree for advanced deduplication.
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https://sudonull.com/data-scientist-from-scratch-free-program
Master Data Science for free in 8–10 months. Complete roadmap: from CS basics to TensorFlow and AirFlow. Start learning and look for junior vacancies today.
https://sudonull.com/data-types-for-passport-and-identifiers-in-sql-storage-errors
Learn why passport and other identifiers should be stored as strings, not numbers in SQL. Avoid loss of leading zeros and data errors. Read the guide for developers.
https://sudonull.com/sql-courses-2026-choosing-training-for-it-specialists-and-analysts
Review of the Best SQL Courses in 2026 Taking into Account AI Integration. Selection Criteria, Skills for Developers and Analysts, Job Market Prospects.
https://sudonull.com/sql-trainer-practice-queries-for-developers
Master SQL on real tasks in an interactive trainer. Modules on online store and library with JOIN, aggregations. For middle/senior dev and analysts. Start practice without theory right now.
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