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🔥 12 Tricky SQL Server Interview Questions You Must Know (NULL, COUNT, ROUND Explained!)
SQL Server interviews often include small but extremely tricky questions that test your real understanding, not just syntax.
In this video, we break down 12 tricky SQL Server questions that confuse even experienced developers:
✔ COUNT(*) vs COUNT(1)
✔ 100 + NULL and NULL + 0 behavior
✔ String vs number addition (80 + '40' vs '80' + '40')
✔ Modulus vs division (11 % 5 vs 11 / 5)
✔ SUM() with NULL values
✔ CONCAT() vs + operator
✔ COALESCE() and ISNULL() differences
✔ CASE WHEN NULL = NULL trap
✔ ROUND() function precision
These questions are commonly asked in real SQL Server interviews and are perfect for:
🎯 Interview preparation
🎯 SQL fundamentals revision
🎯 Beginners & experienced developers
👉 Watch till the end to avoid common SQL interview mistakes!
Видео 🔥 12 Tricky SQL Server Interview Questions You Must Know (NULL, COUNT, ROUND Explained!) канала SQLCodeClarity
In this video, we break down 12 tricky SQL Server questions that confuse even experienced developers:
✔ COUNT(*) vs COUNT(1)
✔ 100 + NULL and NULL + 0 behavior
✔ String vs number addition (80 + '40' vs '80' + '40')
✔ Modulus vs division (11 % 5 vs 11 / 5)
✔ SUM() with NULL values
✔ CONCAT() vs + operator
✔ COALESCE() and ISNULL() differences
✔ CASE WHEN NULL = NULL trap
✔ ROUND() function precision
These questions are commonly asked in real SQL Server interviews and are perfect for:
🎯 Interview preparation
🎯 SQL fundamentals revision
🎯 Beginners & experienced developers
👉 Watch till the end to avoid common SQL interview mistakes!
Видео 🔥 12 Tricky SQL Server Interview Questions You Must Know (NULL, COUNT, ROUND Explained!) канала SQLCodeClarity
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6 января 2026 г. 9:26:04
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