Skill Topic · Cinematic

📘 SQL NOT NULL - Empty Values Allowed Nahi!

NOT NULL constraint ensure karta hai ke column me hamesha value honi chahiye — NULL/empty kabhi…

Overview

📘 SQL NOT NULL - Empty Values Allowed Nahi! — Quick Facts

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Feature: NOT NULL

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NULL allowed?: ❌ No

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Duplicates?: ✅ Yes

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Per table limit?: Unlimited

Topic 1

📌 NOT NULL Kya Hai?

📚 By default, SQL me koi bhi column NULL value accept karta hai. NOT NULL lagane se us…

Topic 2

📌 NOT NULL in CREATE TABLE

💡 `sql CREATE TABLE Customers ( CustomerID INT NOT NULL, FirstName VARCHAR(50) NOT NULL,…

Topic 3

📌 NOT NULL in ALTER TABLE

🎯 Existing column pe NOT NULL add karo: `sql -- MySQL: ALTER TABLE Customers MODIFY COLUMN…

Topic 4

📌 NOT NULL + DEFAULT (Best Combo)

⭐ `sql CREATE TABLE Orders ( OrderID INT NOT NULL, CustomerID INT NOT NULL, OrderDate DATE…

Topic 5

📌 NOT NULL vs Other Constraints

Topic 6

📌 Kahan NOT NULL Lagana Chahiye?

✨ ` NOT NULL Decision Guide: ┌──────────────────────────────────────────────────┐ │ │ │ ✅…

Topic 7

📌 Common Patterns

🌟 `sql -- User Registration Table CREATE TABLE Users ( UserID INT NOT NULL PRIMARY KEY,…

Topic 8

✅ Summary

🚀 KEY POINTS: - NOT NULL column me NULL/empty dalna band kar deta hai - CREATE TABLE me…

Comparison

📌 NOT NULL vs Other Constraints

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NULL allowed?: ❌ No

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Duplicates?: ✅ Yes

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Per table limit?: Unlimited

Quick Quiz

Quiz — Question 1

📘 SQL NOT NULL - Empty Values Allowed Nahi! ka sabse sahi definition kya hai?

Quick Quiz

Quiz — Question 2

📘 SQL NOT NULL - Empty Values Allowed Nahi! ka 'NULL allowed?' kya hai?

Complete! 🎉

📘 SQL NOT NULL - Empty Values Allowed Nahi! Complete!

Aliens School · HIEN · Cinematic Knowledge

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