TableNotFound
Visualizers & Guides
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System Design ctrlz How ctrlz works
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Data Engineering Road Map DE Road Map
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Data Layers DataLayers
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ROW_NUMBER vs RANK vs DENSE_RANK Window functions explained
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IN vs EXISTS vs JOIN The NOT IN NULL trap explained
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LEFT JOIN vs INNER JOIN The WHERE clause trap explained
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COUNT(*) vs COUNT(column) The NULL trap explained
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UNION vs UNION ALL The silent row drop explained
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BETWEEN with Timestamps The missing last day explained
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WHERE vs HAVING Why aggregates can't go in WHERE
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NULLIF Explained Sentinel values and division by zero
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Numbers Stored as TEXT Why '10' sorts before '2'
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GROUP BY vs Window Functions The aggregate that ate your rows
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Gaps and Islands Finding streaks without a loop
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CAST's Silent Truncation Why bad TEXT quietly becomes 0 instead of an error
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Contact

Last updated: July 21, 2026

TableNotFound is a small, independently-run project. If you've spotted a bug, have feedback, or want to suggest a company scenario, I'd like to hear from you.

Email

The most reliable way to reach me: dataengineeringtamil@gmail.com

Elsewhere

You can also find me at linkedin.com/in/sbgowtham.

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