Skill Topic · Cinematic

📘 SQL FOREIGN KEY - Tables Ko Link Karna

FOREIGN KEY do tables ko connect karti hai — child table ka column parent table ke PRIMARY KEY ko…

Overview

📘 SQL FOREIGN KEY - Tables Ko Link Karna — Quick Facts

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CustomerID: FirstName

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1: Anil

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2: Priya

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3: Ravi

Topic 1

📌 FOREIGN KEY Kya Hai?

📚 FOREIGN KEY ek column (ya columns) hai jo dusri table ke PRIMARY KEY ko reference karta…

Topic 2

📌 Demo Tables

Topic 3

📌 FOREIGN KEY in CREATE TABLE

🎯 Column Level: `sql CREATE TABLE Orders ( OrderID INT PRIMARY KEY, OrderDate DATE, Amount…

Topic 4

📌 FOREIGN KEY Test

⭐ `sql -- ✅ Works: CustomerID=1 exists in Customers INSERT INTO Orders VALUES (104,…

Topic 5

📌 FOREIGN KEY Rules (Referential Integrity)

🔑 ` Referential Integrity Rules: ┌──────────────────────────────────────────────────┐ │ │ │…

Topic 6

📌 ON DELETE / ON UPDATE Actions

✨ `sql CREATE TABLE Orders ( OrderID INT PRIMARY KEY, CustomerID INT, CONSTRAINT…

Topic 7

📌 ALTER TABLE se FOREIGN KEY Add

🌟 `sql -- Add FOREIGN KEY: ALTER TABLE Orders ADD CONSTRAINT fk_order_customer FOREIGN KEY…

Topic 8

📌 FOREIGN KEY Drop Karna

🚀 `sql -- MySQL: ALTER TABLE Orders DROP FOREIGN KEY fk_order_customer; -- SQL Server:…

Topic 9

📌 Multiple FOREIGN KEYs

📚 `sql CREATE TABLE OrderDetails ( DetailID INT PRIMARY KEY, OrderID INT, ProductID INT,…

Topic 10

📌 Self-Referencing FOREIGN KEY

💡 `sql -- Employee-Manager relationship (same table) CREATE TABLE Employees ( EmpID INT…

Topic 11

📌 ON DELETE Action — Kaunsa Choose Karein?

🎯 ` Decision Guide: ┌──────────────────────────────────────────────────┐ │ │ │ CASCADE: Jab…

Topic 12

✅ Summary

⭐ KEY POINTS: - FOREIGN KEY child table ko parent table se link karti hai - FK value parent…

Quick Quiz

Quiz — Question 1

📘 SQL FOREIGN KEY - Tables Ko Link Karna ka sabse sahi definition kya hai?

Quick Quiz

Quiz — Question 2

📘 SQL FOREIGN KEY - Tables Ko Link Karna ka '1' kya hai?

Complete! 🎉

📘 SQL FOREIGN KEY - Tables Ko Link Karna Complete!

Aliens School · HIEN · Cinematic Knowledge

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