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Skill Topic ยท Cinematic

๐Ÿ“˜ SQL FOREIGN KEY - Tables Ko Link Karna

FOREIGN KEY do tables ko connect karti hai โ€” child table ka column parent table ke PRIMARY KEY koโ€ฆ

Overview
๐ŸŒŸ

๐Ÿ“˜ SQL FOREIGN KEY - Tables Ko Link Karna โ€” Quick Facts

๐Ÿ“Œ

CustomerID: FirstName

๐ŸŽฏ

1: Anil

โšก

2: Priya

๐Ÿ”‘

3: Ravi

Topic 1
๐Ÿ“š

๐Ÿ“Œ FOREIGN KEY Kya Hai?

๐Ÿ“š FOREIGN KEY ek column (ya columns) hai jo dusri table ke PRIMARY KEY ko reference kartaโ€ฆ
Topic 2
๐Ÿ’ก ๐Ÿ“Š ๐Ÿ”ฌ

๐Ÿ“Œ Demo Tables

๐Ÿ’ก Customers (Parent Table): | CustomerID | FirstName | LastName | City |โ€ฆ
Topic 3
๐Ÿ”’

๐Ÿ“Œ FOREIGN KEY in CREATE TABLE

๐ŸŽฏ Column Level: `sql CREATE TABLE Orders ( OrderID INT PRIMARY KEY, OrderDate DATE, Amountโ€ฆ
Topic 4
๐Ÿ“ฅ ๐Ÿ“ฅ ๐Ÿง  ๐Ÿ”ฌ ๐Ÿ’ก ๐ŸŽฏ

๐Ÿ“Œ FOREIGN KEY Test

โญ `sql -- โœ… Works: CustomerID=1 exists in Customers INSERT INTO Orders VALUES (104,โ€ฆ
Topic 5
๐Ÿ“ฅ ๐Ÿ“ฅ ๐Ÿง  ๐Ÿ”ฌ ๐Ÿ’ก ๐ŸŽฏ

๐Ÿ“Œ FOREIGN KEY Rules (Referential Integrity)

๐Ÿ”‘ ` Referential Integrity Rules: โ”Œโ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ” โ”‚ โ”‚ โ”‚โ€ฆ
Topic 6
โœจ ๐Ÿ“Š ๐Ÿ”ฌ

๐Ÿ“Œ ON DELETE / ON UPDATE Actions

โœจ `sql CREATE TABLE Orders ( OrderID INT PRIMARY KEY, CustomerID INT, CONSTRAINTโ€ฆ
Topic 7
๐Ÿ”’

๐Ÿ“Œ ALTER TABLE se FOREIGN KEY Add

๐ŸŒŸ `sql -- Add FOREIGN KEY: ALTER TABLE Orders ADD CONSTRAINT fk_order_customer FOREIGN KEYโ€ฆ
Topic 8
๐Ÿš€

๐Ÿ“Œ FOREIGN KEY Drop Karna

๐Ÿš€ `sql -- MySQL: ALTER TABLE Orders DROP FOREIGN KEY fk_order_customer; -- SQL Server:โ€ฆ
Topic 9
๐Ÿ“ฅ ๐Ÿ“ฅ ๐Ÿง  ๐Ÿ”ฌ ๐Ÿ’ก ๐ŸŽฏ

๐Ÿ“Œ Multiple FOREIGN KEYs

๐Ÿ“š `sql CREATE TABLE OrderDetails ( DetailID INT PRIMARY KEY, OrderID INT, ProductID INT,โ€ฆ
Topic 10
๐Ÿ’ก ๐Ÿ“Š ๐Ÿ”ฌ

๐Ÿ“Œ Self-Referencing FOREIGN KEY

๐Ÿ’ก `sql -- Employee-Manager relationship (same table) CREATE TABLE Employees ( EmpID INTโ€ฆ
Topic 11
๐Ÿ“ฅ ๐Ÿ“ฅ ๐Ÿง  ๐Ÿ”ฌ ๐Ÿ’ก ๐ŸŽฏ

๐Ÿ“Œ ON DELETE Action โ€” Kaunsa Choose Karein?

๐ŸŽฏ ` Decision Guide: โ”Œโ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ”€โ” โ”‚ โ”‚ โ”‚ CASCADE: Jabโ€ฆ
Topic 12
โญ

โœ… Summary

โญ KEY POINTS: - FOREIGN KEY child table ko parent table se link karti hai - FK value parentโ€ฆ
Quick Quiz
๐Ÿง  QUIZ TIME

Quiz โ€” Question 1

๐Ÿ“˜ SQL FOREIGN KEY - Tables Ko Link Karna ka sabse sahi definition kya hai?

Quick Quiz
๐Ÿง  QUIZ TIME

Quiz โ€” Question 2

๐Ÿ“˜ SQL FOREIGN KEY - Tables Ko Link Karna ka '1' kya hai?

Complete! ๐ŸŽ‰
COMPLETE

๐Ÿ“˜ SQL FOREIGN KEY - Tables Ko Link Karna Complete!

Aliens School ยท HIEN ยท Cinematic Knowledge

โœ…

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