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๐Ÿ“˜ SQL Self Join - Table Apne Aap Se Join

Self Join me ek table apne aap ke saath join hoti hai โ€” jaise employees table me manager dhundhna! ๐Ÿ”

Overview
๐ŸŒŸ

๐Ÿ“˜ SQL Self Join - Table Apne Aap Se Join โ€” Quick Facts

๐Ÿ“Œ

EmployeeID: EmployeeName

๐ŸŽฏ

1: Ahmed Khan

โšก

2: Sara Ali

๐Ÿ”‘

3: Raj Kumar

Topic 1
๐Ÿ“š

๐Ÿ“Œ Self Join Kya Hai?

๐Ÿ“š Self Join me ek table ko khud ke saath join karte hain. Iske liye table ko do alagโ€ฆ
Topic 2
๐Ÿ’ก ๐Ÿ“Š ๐Ÿ”ฌ

๐Ÿ“Œ Self Join Syntax

๐Ÿ’ก `sql SELECT a.column, b.column FROM table_name AS a JOIN table_name AS b ON a.column =โ€ฆ
Topic 3
๐Ÿ”’

๐Ÿ“Œ Demo Database โ€” Employees

๐ŸŽฏ | EmployeeID | EmployeeName | ManagerID | City |โ€ฆ
Topic 4
โญ

๐Ÿ“Œ Employee Ka Manager Dhundho

โญ `sql -- Har employee ke saath uska manager dikhao SELECT e.EmployeeName AS Employee,โ€ฆ
Topic 5
๐Ÿ“ฅ ๐Ÿ“ฅ ๐Ÿง  ๐Ÿ”ฌ ๐Ÿ’ก ๐ŸŽฏ

๐Ÿ“Œ CEO (Top Manager) Bhi Dikhao โ€” LEFT JOIN

๐Ÿ”‘ `sql -- LEFT JOIN se sab employees aayenge (CEO bhi) SELECT e.EmployeeName AS Employee,โ€ฆ
Topic 6
โœจ ๐Ÿ“Š ๐Ÿ”ฌ

๐Ÿ“Œ Same City Ke Employees Dhundho

โœจ `sql -- Woh employees jo SAME city me hain (apne aap ko exclude) SELECT a.EmployeeName ASโ€ฆ
Topic 7
๐Ÿ”’

๐Ÿ“Œ Customers โ€” Same Country Ke Customers

๐ŸŒŸ `sql -- Demo: Customers table -- Same country ke alag alag customers dhundho SELECTโ€ฆ
Topic 8
โœจ

๐Ÿ“Œ Self Join Use Cases

๐Ÿš€ ` Common Self Join Patterns: 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 9
โœจ

๐Ÿ“Œ Sequential Comparison

๐Ÿ“š `sql -- Consecutive orders ka amount compare karo SELECT a.OrderID AS Order1, a.Amount ASโ€ฆ
Topic 10
๐Ÿ’ก ๐Ÿ“Š ๐Ÿ”ฌ

๐Ÿ“Œ Self Join Key Rules

๐Ÿ’ก | Rule | Description | |------|-------------| | Aliases mandatory | Bina alias ke SQLโ€ฆ
Topic 11
๐Ÿ”’

โœ… Summary

๐ŸŽฏ KEY POINTS: - Self Join = table apne aap ke saath join hoti hai - Do aliases zaroori hainโ€ฆ
Quick Quiz
๐Ÿง  QUIZ TIME

Quiz โ€” Question 1

๐Ÿ“˜ SQL Self Join - Table Apne Aap Se Join ka sabse sahi definition kya hai?

Quick Quiz
๐Ÿง  QUIZ TIME

Quiz โ€” Question 2

๐Ÿ“˜ SQL Self Join - Table Apne Aap Se Join ka '1' kya hai?

Complete! ๐ŸŽ‰
COMPLETE

๐Ÿ“˜ SQL Self Join - Table Apne Aap Se Join Complete!

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โœ…

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