🧠 Data Analyst Interview Common Interview Traps – Day 4

❓ “Is NULL equal to zero or an empty string?”

❌ Trap Answer:

“Yes, NULL means no value, so it’s like zero or empty.”

✅ Smart Answer:

“No. NULL means unknown or missing.
It behaves differently in comparisons, aggregations, and joins.”

🎯 Interviewer is testing:
Your understanding of three-valued logic.

💡 Tip:
Always handle NULLs explicitly.

React 👍 if you want interview prep #5 tomorrow