AnomalyGuard
Month: December 2025
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Today, many companies are doing everything “by the book.”Their data is high quality, well prepared, and available in the right form. Modern BI tools, AI, and ML solutions are in place. Governance is defined, access rights make sense. And yet, in practice, things still grind. Data and BI fail to deliver the value they clearly…
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This is a regular “data quiz”. Follow it on LinkedIn. Test your knowledge or learn something new. Today Question: In PostgreSQL, the VACUUM command is used to: A) Data compression B) Removing dead rows C) Reindexing D) Update Correct Answer: B Explanation The VACUUM command in PostgreSQL is used for database maintenance by removing dead rows created during UPDATE and DELETE operations. PostgreSQL uses MVCC (Multiversion Concurrency Control), which…
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Ho-ho-ho… and away with the data! If the Grinch decided to attack the world’s Christmas cheer in 2025, his target wouldn’t just be presents, but the most valuable thing to data people (Data Scientists, Analysts, Engineers): their data, models, and efficiency. Here is his cunning plan for ruining Christmas for everyone living in the era…
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This is a regular “data quiz”. Follow it on LinkedIn. Test your knowledge or learn something new. Today Question: Which SQL data type stores JSON structures? A) TEXT B) OBJECT C) JSON D) STRUCT Correct Answer: C Explanation The JSON data type is a relatively new feature of modern SQL databases that allows native storage and processing of JSON (JavaScript Object Notation) documents directly in…
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This is a regular “data quiz”. Follow it on LinkedIn. Test your knowledge or learn something new. Today Question: Data normalization serves to: A) Increase redundancy B) Remove duplicates C) Speed up queries D) Simplify JOINs Correct Answer: B Explanation Normalization is a fundamental principle of relational database design that aims to eliminate redundancy and ensure data consistency. The normalization process divides large tables into smaller, logically…
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This is a regular “data quiz”. Follow it on LinkedIn. Test your knowledge or learn something new. Today Question: Which SQL command deletes a table along with its structure? A) DELETE B) DROP C) TRUNCATE D) REMOVE Correct Answer: B Explanation The DROP command is one of the most destructive SQL commands, which completely removes a table from the database including its structure, data, indexes, triggers, and all…
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Hello fellow data maniacs and everyone hunting for the perfect gift for their spouse/partner/colleague in the Data Department! The holidays are approaching, and we all know how challenging it is to pick a gift that would genuinely excite a data person. 😴 Another mug? A binary code t-shirt? NO. We, data professionals, have one thing…
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In data engineering, there are two fundamentally different ways to learn. An employee lives inside one environment, one architecture, one business context. They see how a system evolves, how it’s adjusted over time, how the company fights with it, and eventually how the organization adapts to it. They see the long-term consequences of design choices,…
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This is a regular “data quiz”. Follow it on LinkedIn. Test your knowledge or learn something new. Today Question: What is the purpose of an index in a database? A) Increase write speed B) Increase read speed C) Reduce data size D) Replace keys Correct Answer: B Explanation A database index is a data structure that significantly speeds up searching and reading data from tables. It works similarly to an index in a book –…
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This is a regular “data quiz”. Follow it on LinkedIn. Test your knowledge or learn something new. Today Question: Which type of JOIN returns all rows from the left table and matching ones from the right? A) INNER B) LEFT C) RIGHT D) FULL Correct Answer: B Explanation LEFT JOIN is one of the most…