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A preview from our curated question bank. The generator produces fresh, AI-tailored questions on each run.
Write a SQL query to find the second-highest salary from an Employee table.
Tip: Use LIMIT with OFFSET, or a subquery with MAX(salary) WHERE salary < MAX. Mention edge cases: what if two employees share the highest salary?
What is the difference between INNER JOIN and LEFT JOIN?
Tip: INNER JOIN returns only matching rows. LEFT JOIN returns all rows from the left table with NULLs for non-matching right rows. Draw a Venn diagram mentally as you explain.
What is the difference between GROUP BY and HAVING? Can you use HAVING without GROUP BY?
Tip: GROUP BY groups rows; HAVING filters those groups. Yes, HAVING without GROUP BY treats the entire table as one group — rarely useful but valid SQL.
How do you handle missing values (NULLs) in a dataset? Give at least three strategies.
Tip: Deletion (if <5% missing), mean/median/mode imputation, forward-fill for time series, or model-based imputation. State when you would choose each.
What is the difference between supervised and unsupervised learning?
Tip: Supervised: labelled data, learns a mapping (classification/regression). Unsupervised: no labels, finds patterns (clustering, dimensionality reduction). Give one example each.
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