Skill Topic · Cinematic

📘 SQL NULL Values - Khaali Values

NULL matlab "koi value nahi hai" — yeh zero (0) ya empty string ("") se ALAG cheez hai! 🕳️

Overview

📘 SQL NULL Values - Khaali Values — Quick Facts

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CustomerID: CustomerName

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1: Ahmed Electronics

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2: Sara Boutique

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3: Raj Traders

Topic 1

📌 NULL Kya Hai?

📚 NULL ka matlab hai ki field me koi value nahi hai. Yeh missing ya unknown data ko…

Topic 2

📌 NULL Ka Problem

💡 NULL ko normal operators se check NAHI kar sakte: `sql -- ❌ Yeh KAAM NAHI KAREGA! SELECT…

Topic 3

📌 Demo Database

Topic 4

📌 IS NULL — Khaali Values Dhundna

⭐ sql -- Jahan ContactName KHAALI hai SELECT * FROM Customers WHERE ContactName IS NULL; …

Topic 5

📌 IS NOT NULL — Bhare Hue Values

🔑 `sql -- Jahan ContactName me VALUE hai (khaali nahi) SELECT * FROM Customers WHERE…

Topic 6

📌 NULL Ka Visual Samjho

✨ ` NULL Checking: ┌──────────────────────────────────────────────────┐ │ Row 1:…

Topic 7

📌 NULL with UPDATE — NULL Fix Karna

🌟 NULL values ko update karke fix kar sakte ho: `sql -- Sara Boutique ka ContactName fill…

Topic 8

📌 NULL Ka Impact Calculations Me

🚀 NULL calculations me bhi problem karta hai: `sql -- Agar Price NULL hai to SELECT…

Topic 9

📌 NULL Handle Karna — IFNULL / COALESCE

📚 Different databases me NULL handle karne ke alag functions hain: `sql -- MySQL: IFNULL()…

Topic 10

✅ Summary

💡 KEY POINTS: - NULL = "koi value nahi" — zero ya empty string NAHI hai - NULL check karne…

Quick Quiz

Quiz — Question 1

📘 SQL NULL Values - Khaali Values ka sabse sahi definition kya hai?

Quick Quiz

Quiz — Question 2

📘 SQL NULL Values - Khaali Values ka '1' kya hai?

Complete! 🎉

📘 SQL NULL Values - Khaali Values Complete!

Aliens School · HIEN · Cinematic Knowledge

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