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Candidate Key

Candidate key ek relational database concept hai jo kisi table me ek aisi minimal set of columns…

Overview
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Candidate Key — Quick Facts

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Property: Detail

🎯

Concept Type: Relational Database Theory / Data…

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Domain: Database Design, Backend…

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Formal Definition: Minimal superkey — a set of…

Topic 1
📥 📥 🧠 🔬 💡 🎯

Quick Info

📚 | Property | Detail | |---|---| | Concept Type | Relational Database Theory / Data…
Topic 2
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Formal Definition

💡 Candidate key ko properly samajhne ke liye pehle superkey samajhna zaroori hai. Superkey…
Topic 3
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Key Hierarchy

🎯 `mermaid flowchart TD A[All Attribute Combinations] --> B[Superkeys<br/>Uniquely identify…
Topic 4
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Example: Students Table

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StudentID ko primary key banate…

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Email aur Phone alternate keys ban…

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Candidate Key Properties

🔑 | Property | Description | Example | |---|---|---| | Uniqueness | Koi bhi do rows same…
Topic 6
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Simple vs Composite Candidate Key

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{StudentID} — single column se…

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{ISBN} — books table me ek number…

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{SSN} — person table me social…

Topic 7
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Candidate Key vs Related Concepts

🌟 | Concept | Definition | Relationship to Candidate Key | |---|---|---| | Superkey | Any…
Topic 8
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Finding Candidate Keys (Theory)

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FDs: {A → B, B → C, A → D}

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{A}+ = {A, B, C, D} = all…

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Kya minimal hai? Haan — sirf 1…

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{A} is a candidate key ✓

Topic 9
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Primary Key Selection: Best Practices

📚 Jab multiple candidate keys hon, to primary key kaise choose karein? Stability First Aisi…
Topic 10
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Candidate Keys aur Normalization

💡 Candidate keys normalization process me central role play karti hain: First Normal Form…
Topic 11
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Common Mistakes

🎯 | Mistake | Problem | Solution | |---|---|---| | Superkey ko candidate key samajhna |…
Topic 12
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Real-World Examples

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{ProductID} — surrogate candidate…

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{SKU} — natural candidate key…

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{Barcode} — natural candidate key…

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Primary key: ProductID (stable,…

Topic 13
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Summary

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Candidate key = minimal superkey…

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Ek table me 1 ya zyada candidate…

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Primary key candidate keys me se…

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Simple key prefer karo over…

Comparison
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Simple vs Composite Candidate Key

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S001: CS101

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S001: CS102

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S002: CS101

Comparison
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Candidate Key vs Related Concepts

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Superkey: Any set of columns that…

⚖️

Primary Key: Chosen candidate key —…

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Alternate Key: Candidate keys jo…

Diagram
📥 ⚙️ 🔬 💡

Visual Flow

📊 Diagram visualization — details in narration
Related Topics

See Also

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Primary key

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Super key

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Foreign key

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Normalization

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Functional dependency

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Database schema

Quick Quiz
🧠 QUIZ TIME

Quiz — Question 1

Candidate Key ka sabse sahi definition kya hai?

Quick Quiz
🧠 QUIZ TIME

Quiz — Question 2

Candidate Key ka 'Concept Type' kya hai?

Complete! 🎉
COMPLETE

Candidate Key Complete!

Aliens Wiki · HIEN · Cinematic Knowledge

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Candidate Key Complete

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Primary key

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