E-book FREE ACCESS Intermediate

25 SQL Interview Questions with Model Answers

by LucidPlexus
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Twenty-five SQL interview questions on the LucidPlexus books' tables, each with the model query, its real result, the answer to say aloud and the trap. The questions run from easy to hard in six groups: filtering, aggregation, joins, window functions, dates and…
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Twenty-five SQL interview questions on the LucidPlexus books' tables, each with the model query, its real result, the answer to say aloud and the trap.

The questions run from easy to hard in six groups: filtering, aggregation, joins, window functions, dates and data quality. Most are on HealSync's healthcare tables from Explain Your Query; the others use Clearstone's books and Lanternfield's startup applications. Every query was run in DuckDB and its result is printed under it.

The traps are the ones that give a wrong answer without an error: AND binding before OR, a status label that disagrees with the dates, a denominator nobody named, an inner join that drops rows, duplicates inside a ranking, text in a date column.

Between the questions are short boxes of interview habits, and the end has a score-yourself grid and a note on how to answer aloud. PDF, ten A4 pages.

#duckdb #interview-prep #joins #sql #sql-interview #window-functions
Type E-book
Pages 10
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