SQL Interview Tips

Ace your SQL interviews with these tips.

What to expect:

• Live coding on a whiteboard or shared screen
• 2-4 problems in 45-60 minutes
• Increasing difficulty

Common topics:

• JOINs (especially LEFT JOIN)
• GROUP BY with HAVING
• Window functions (RANK, ROW_NUMBER)
• Subqueries and CTEs
• Finding duplicates, top N per group

Tips:

1. Clarify requirements before coding
2. Talk through your approach
3. Start simple, then optimize
4. Test with edge cases mentally
5. Practice on DataLemur, LeetCode, HackerRank

You've got this!