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- SQL.How can you compare two nullable values safely, and how does IS DISTINCT FROM differ from <>?
- SQL.How are NULL values ordered by ORDER BY, how do defaults differ between databases, and how can you control their placement?
- SQL.How does NULL propagate through arithmetic expressions, and how can COALESCE and NULLIF help handle missing values and division by zero?
- SQL.How does NULL affect join conditions, and why can filtering the right-hand table in WHERE remove unmatched rows from a LEFT JOIN?
- SQL.How do GROUP BY and DISTINCT treat NULL values, even though NULL = NULL evaluates to UNKNOWN?
- SQL.How do aggregate functions handle NULL, and what is the difference between COUNT(*), COUNT(column), and COUNT(DISTINCT column)?
- SQL.How does NULL affect IN and NOT IN, and why can NOT EXISTS be a safer choice when a subquery returns nullable values?
- SQL.How do WHERE, HAVING, and CHECK constraints treat conditions that evaluate to UNKNOWN?
- SQL.Why do column = NULL and column <> NULL not work as expected, and when should you use IS NULL and IS NOT NULL?
- SQL.What is SQL’s three-valued logic (TRUE, FALSE, UNKNOWN), and how do AND, OR, and NOT behave with UNKNOWN?
- ChromeDevTools.Watch all failed requests
- SQL.What are domain types (or constraints on data types), and how do they help enforce data correctness?
- SQL.How does SQL handle comparisons between different data types (for example, string vs number), and why is this dangerous?
- SQL.What is the difference between DATE, TIME, TIMESTAMP, and TIMESTAMPTZ, and which one should be used for business events?
- SQL.How do numeric types like INTEGER, BIGINT, DECIMAL, and FLOAT differ in terms of precision and use cases?
- SQL.What problems can arise from implicit type casting in SQL, and how can it affect indexes?
- SQL.How does NULL differ from 0, an empty string, or FALSE in SQL?
- SQL.What is the difference between CHAR, VARCHAR, and TEXT, and when would you choose each?
- SQL.What is MVCC ?
- SQL.What is AutoVacuum Postgres ?
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Author Archives: Stanislav_Panteleev
Reading.CleanArchitecture.Embedded
(Clean Architecture by Robert C. Martin) This chapter explores how the principles of Clean Architecture apply to embedded systems. Embedded systems, which are constrained by hardware resources and tightly coupled to hardware functionality, require a unique approach to achieve flexibility, … Continue reading
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Reading.CleanArchitecture.TestBoundary
1. The Importance of Boundaries in Testing Boundaries separate different components or layers of a system, such as the business logic, UI, database, and external APIs. Well-defined boundaries make it possible to: Test components in isolation. Mock or stub external … Continue reading
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Reading.CleanArchitecture.Services
Key Concepts of Services: Great and Small 1. What Are Services? A service is any software component that performs a specific function or provides a set of behaviors to other components. Services can exist at various levels within the architecture, … Continue reading
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Reading.CleanArchitecture.MainComponent
Main Component (Clean Architecture by Robert C. Martin) The Main Component chapter discusses the core entry point of a software system and its role in initializing the application, wiring dependencies, and starting the execution flow. The main component serves as … Continue reading
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Reading.CleanArchitecture.PartialBoundaries
Key Concepts of Chapter 24 1. What Are Partial Boundaries? Definition: Partial boundaries are less rigid separations between components or layers in a system. Instead of fully isolating layers or modules, partial boundaries allow some controlled leakage of details to … Continue reading
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Reading.CleanArchitecture.Presenters
looks likt this is model view (Clean Architecture by Robert C. Martin) In this chapter, Robert C. Martin discusses the concept of humble objects and their role in isolating volatile or hard-to-test code. He introduces presenters as an example of … Continue reading
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Read.CleanArchitecture.CleanArchitecture
Key Concepts of the Clean Architecture 1. The Goal of Clean Architecture Primary Objective: Create a system that is: Independent of frameworks: Frameworks are tools, not the foundation of the architecture. Testable: Business rules can be tested without external dependencies. … Continue reading
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Reading.CleanArchiteture.ScreamingArchiteture
SCREAMING ARCHITECTURE (Clean Architecture by Robert C. Martin) The “Screaming Architecture” concept in Clean Architecture emphasizes that the primary purpose of a software system—its business intent—should be immediately clear from its structure and organization. This chapter challenges traditional, technology-centric design … Continue reading
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Reading.CleanArchitecture.BusinessRules
1. What Are Business Rules? Definition: Business rules are the policies, procedures, and logic that define how a business operates and achieves its goals. Examples: “A customer cannot place an order if their credit limit is exceeded.” “An employee must … Continue reading
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Reading.CleanArchitecture.PolicyAndLevel
This chapter focuses on the relationship between policies and levels in software architecture. Robert C. Martin explains how to organize and prioritize policies in layers and levels to create systems that are adaptable, maintainable, and scalable.
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