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Skill Topic ยท Cinematic

๐Ÿ“˜ SQL PRIMARY KEY - Table Ka Main Identifier

PRIMARY KEY table ka sabse important column hai โ€” har row ko uniquely identify karta hai, NULL aurโ€ฆ

Overview
๐ŸŒŸ

๐Ÿ“˜ SQL PRIMARY KEY - Table Ka Main Identifier โ€” Quick Facts

๐Ÿ“Œ

Practice: Recommendation

๐ŸŽฏ

Type: INT ya BIGINT (surrogate key)

โšก

Auto Increment: Hamesha use karo

๐Ÿ”‘

Naming: pk_tablename convention follow karo

Topic 1
๐Ÿค–

๐Ÿ“Œ PRIMARY KEY Kya Hai?

๐Ÿค– PRIMARY KEY = NOT NULL + UNIQUE combined. Yeh table ka main identifier hai โ€” har row koโ€ฆ
Topic 2
๐Ÿง  ๐Ÿ“Š ๐Ÿ”ฌ

๐Ÿ“Œ PRIMARY KEY in CREATE TABLE

๐Ÿง  Single Column: `sql -- Column level: CREATE TABLE Customers ( CustomerID INT NOT NULLโ€ฆ
Topic 3
๐Ÿ”’

๐Ÿ“Œ Composite PRIMARY KEY (Multiple Columns)

๐Ÿ’ก Jab ek column unique nahi ho sakta, to multiple columns ka combination PRIMARY KEY bantaโ€ฆ
Topic 4
โšก

๐Ÿ“Œ ALTER TABLE se PRIMARY KEY Add

โšก `sql -- Single column: ALTER TABLE Customers ADD PRIMARY KEY (CustomerID); -- Named:โ€ฆ
Topic 5
๐Ÿ“ฅ ๐Ÿ“ฅ ๐Ÿง  ๐Ÿ”ฌ ๐Ÿ’ก ๐ŸŽฏ

๐Ÿ“Œ PRIMARY KEY Drop Karna

๐ŸŽฏ `sql -- MySQL: ALTER TABLE Customers DROP PRIMARY KEY; -- SQL Server: ALTER TABLEโ€ฆ
Topic 6
โœจ

๐Ÿ“Œ PRIMARY KEY Types โ€” Natural vs Surrogate

๐Ÿ”ฎ ` Natural vs Surrogate Key: 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 7
๐Ÿ”’

๐Ÿ“Œ PRIMARY KEY + FOREIGN KEY Relationship

๐ŸŒ `sql -- Parent table (PRIMARY KEY) CREATE TABLE Customers ( CustomerID INT PRIMARY KEY,โ€ฆ
Topic 8
โœจ

๐Ÿ“Œ PRIMARY KEY Best Practices

๐Ÿ“Š | Practice | Recommendation | |----------|---------------| | Type | INT ya BIGINTโ€ฆ
Topic 9
๐Ÿ“ฅ ๐Ÿ“ฅ ๐Ÿง  ๐Ÿ”ฌ ๐Ÿ’ก ๐ŸŽฏ

๐Ÿ“Œ Complete Example

๐Ÿค– `sql -- Database with proper PRIMARY KEYs: CREATE TABLE Departments ( DeptID INT NOT NULLโ€ฆ
Topic 10
๐Ÿง  ๐Ÿ“Š ๐Ÿ”ฌ

โœ… Summary

๐Ÿง  KEY POINTS: - PRIMARY KEY = NOT NULL + UNIQUE โ€” table ka main identifier - Ek table meโ€ฆ
Quick Quiz
๐Ÿง  QUIZ TIME

Quiz โ€” Question 1

๐Ÿ“˜ SQL PRIMARY KEY - Table Ka Main Identifier ka sabse sahi definition kya hai?

Quick Quiz
๐Ÿง  QUIZ TIME

Quiz โ€” Question 2

๐Ÿ“˜ SQL PRIMARY KEY - Table Ka Main Identifier ka 'Type' kya hai?

Complete! ๐ŸŽ‰
COMPLETE

๐Ÿ“˜ SQL PRIMARY KEY - Table Ka Main Identifier Complete!

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๐Ÿ“˜ SQL PRIMARY KEY - Table Ka Main Identifier Complete

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