Common Interview Questions and Answers
Practice the most frequently asked interview questions with expert answers, approach tips, and AI-powered feedback.
102.8K views•1mo ago
Explain normalization and describe the first three normal forms.
SQL
Hard
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80.3K views•1mo ago
How do you calculate a running total in SQL?
SQL
Medium
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106K views•1mo ago
Explain the difference between EXISTS and IN clauses.
SQL
Medium
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77.9K views•1mo ago
What is a cross join and when should you use it?
SQL
Easy
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124.3K views•1mo ago
How do foreign keys enforce referential integrity?
SQL
Easy
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149.8K views•1mo ago
What are correlated subqueries and how do they work?
SQL
Hard
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55.8K views•1mo ago
What is the difference between RANK, DENSE_RANK, and ROW_NUMBER?
SQL
Medium
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57.8K views•1mo ago
What are set operations like UNION, INTERSECT, and EXCEPT?
SQL
Medium
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117.2K views•1mo ago
What is a view in SQL and why would you use it?
SQL
Medium
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71.6K views•1mo ago
What is an anti-join and how do you implement it in SQL?
SQL
Medium
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