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Copyright (c) A|iens. All rights reserved.

============================================================================ Article Name :…

Overview
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Copyright (c) A|iens. All rights reserved. — Quick Facts

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Property: Detail

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Full Name: Candidate Key

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Also Known As: Minimal Superkey

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Type: Relational database constraint /…

Topic 1
📥 📥 🧠 🔬 💡 🎯

Infobox

📚 | Property | Detail | |---|---| | Full Name | Candidate Key | | Also Known As | Minimal…
Topic 2
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Kya Hai Candidate Key

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StudentID — har student ka unique…

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Email — har student ka unique…

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AadharNumber — har student ka…

Topic 3
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Real-Life Analogy

🎯 Sochlo tum ek school ke principal ho aur tumhe har student ko uniquely identify karna…
Topic 4
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Candidate Key Ki Properties

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Uniqueness batata hai ke "yeh set…

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Minimality batata hai ke "yeh set…

Topic 5
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Candidate Key Kaise Identify Karein

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EmpID — Unique? Haan (E001, E002,…

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Email — Unique? Haan (sab…

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Department — Unique? Nahi…

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Phone — Unique? Haan (sab…

Topic 6
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Candidate Key Identification Flow

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Single column candidate keys…

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Composite (multi-column) candidate…

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Agar 2-column combination unique…

Topic 7
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Candidate Key vs Primary Key vs Super Key vs Alternate Key

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Har candidate key ek super key hai…

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Primary key ek candidate key hai —…

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Alternate key bhi candidate key…

Topic 8
📥 📥 🧠 🔬 💡 🎯

Real-World Examples

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StudentID ✅ — Unique, minimal

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AadharNo ✅ — Unique, minimal

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Email ✅ — Unique, minimal

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Name ❌ — Future me duplicate ho…

Topic 9
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Composite Candidate Keys

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StudentID alone ❌ — S001 repeat…

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CourseID alone ❌ — CS101 repeat…

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EnrollDate alone ❌ — Same date…

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{StudentID, CourseID} ✅ —…

Topic 10
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Candidate Key aur Database Normalization

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Table me ek primary key honi…

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1NF ke liye candidate key identify…

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Sab non-key attributes fully…

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Partial dependency not allowed —…

Topic 11
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Candidate Key in Different Database Systems

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Primary Key constraint → chosen…

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UNIQUE + NOT NULL constraint →…

Topic 12
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5 Common Mistakes

⭐ Mistake 1: Super Key Ko Candidate Key Samajhna {StudentID, Email} combination unique hai…
Topic 13
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6 Best Practices

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Surrogate key (auto-increment ID)…

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Natural candidate keys (Email,…

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Dono saath me use karo — surrogate…

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Joins complex hote hain (multiple…

Topic 14
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Interview Questions

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Ek column ya columns ka…

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Ek table me multiple candidate…

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Example: Students table me…

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Candidate keys me se ek chosen key…

Topic 15
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Glossary

🌟 | # | Term | Definition | |---|---|---| | 1 | Candidate Key | Minimal set of columns jo…
Comparison
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Candidate Key vs Primary Key vs Super Key vs Alternate Key

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Definition: Koi bhi set of columns jo…

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Uniqueness: ✅ Haan

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Minimality: ❌ Zaroori nahi

Diagram
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Visual Flow

📊 Diagram visualization — details in narration
Related Topics

See Also

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Primary Key

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Foreign Key

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Super Key

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Composite Key

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Database Normalization

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Functional Dependency

Quick Quiz
🧠 QUIZ TIME

Quiz — Question 1

Copyright (c) A|iens. All rights reserved. ka sabse sahi definition kya hai?

Quick Quiz
🧠 QUIZ TIME

Quiz — Question 2

Copyright (c) A|iens. All rights reserved. ka 'Full Name' kya hai?

Complete! 🎉
COMPLETE

Copyright (c) A|iens. All rights reserved. Complete!

Aliens Wiki · HIEN · Cinematic Knowledge

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Copyright (c) A|iens. All rights reserved. Complete

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Primary Key

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