Live SQL Coding Questions
Part of the Data Analyst Roadmap
In short
In a live SQL round, the interviewer cares as much about how you think as whether the query runs. Talking through a clear process often matters as much as the final answer.
Being asked to write a working SQL query live, often on a shared screen or online editor — testing not just correctness but how you think through the problem out loud.
Think of it like this
Cooking in front of judges
On a cooking show, judges watch every step. The contestant who explains "I'm browning the onions first for sweetness" scores better than one who cooks in silence, even if both dishes taste fine. Narrate your SQL the same way.
Watch it happen
How to tackle a live SQL question
1/5"Second highest salary per department." Ask: what if two people tie? What if a department has one person?
The big ideas
What you need to know
Clarify before typing
Ask about ties, NULLs, duplicates and expected output. Interviewers often leave these vague on purpose.
Build in CTEs
Break the problem into named steps. It's easier to explain, debug and read under pressure.
Know window functions
ROW_NUMBER, RANK, DENSE_RANK, LAG and running SUMs show up in most analyst SQL rounds.
Think out loud
If you get stuck, say what you're trying. Interviewers can nudge you only if they know where you are.
See it in code
Walk through the code
1WITH ranked AS (2 SELECT3 department,4 employee_name,5 salary,6 DENSE_RANK() OVER (7 PARTITION BY department ORDER BY salary DESC8 ) AS rnk9 FROM employees10)11SELECT department, employee_name, salary12FROM ranked13WHERE rnk = 2;1/3A CTE holds the ranked rows, so the final query stays simple.
A classic question. DENSE_RANK handles ties so the second distinct salary is found even if two people share the top one.
Save yourself the pain
Common mistakes
Oops
Starting to type immediately and discovering halfway that you misread the question.
Do this instead
Restate the question and ask about edge cases first. Thirty seconds saves five minutes.
Oops
Going silent for minutes when stuck.
Do this instead
Say what you're considering. "I think a self-join works, but a window function may be cleaner."
Your mission
Practise out loud
Quick check
Salaries in one department are 90, 90, 80. Using DENSE_RANK, which salary gets rank 2?
Go deeper
- 1Practice on a SQL interview question platform under light time pressure.
- 2Talk through your approach out loud before writing any code, even in practice.
- 3Review joins, window functions and CTEs specifically — the most commonly tested topics.
More sql & technical at this stop
Query Optimization Questions
Data Modeling Questions
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