Detective's Journal

SQL vs Excel: When to Use Each (With Side-by-Side Examples)

SQL vs Excel: which should you learn? Visual comparison with side-by-side code examples, decision flowchart, and practical use cases for every role.

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SQL Window Functions Explained: The Complete Visual Guide (2026)

February 12, 2026

14 min read

Hristo Bogoev

SQL Window Functions Explained: The Complete Visual Guide (2026)

Master SQL window functions with visual examples. Learn ROW_NUMBER, RANK, LAG, LEAD, and more with before/after diagrams and interactive quizzes.

DELETE vs TRUNCATE in SQL: When to Use Each (Visual Guide)

Learn the key differences between DELETE and TRUNCATE in SQL with visual examples, decision flowcharts, and common mistakes to avoid.

SQL UNION vs UNION ALL: When to Use Each (With Visual Examples)

Learn the key differences between UNION and UNION ALL in SQL. Visual examples showing when duplicates matter, performance tips, and a decision flowchart.

HAVING vs WHERE in SQL: What's the Difference? (Visual Guide)

Learn the difference between HAVING and WHERE in SQL with visual execution diagrams, code examples, and a quick decision guide. WHERE filters rows, HAVING filters groups.

Is SQL Hard to Learn? What to Actually Expect in 2026

Is SQL hard to learn? Here's what SQL actually looks like at every level, with real code examples, honest timelines, and a role-by-role difficulty breakdown.

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