Wiki Article · Cinematic

Cardinality

Cardinality ek fundamental concept hai jo multiple domains me use hota hai — mathematics (set…

Overview

Cardinality — Quick Facts

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Property: Detail

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Concept Name: Cardinality

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Domain: Mathematics, Database Design, SQL,…

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Also Known As: Relationship multiplicity,…

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Infobox

📚 | Property | Detail | |---|---| | Concept Name | Cardinality | | Domain | Mathematics,…

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Cardinality Mathematics / Set Theory Me

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Agar set A = {1, 2, 3, 4, 5} hai,…

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Agar set B = {} (empty set) hai,…

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Agar set C = {apple, banana,…

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Finite cardinality: Set me…

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Cardinality Database Design Me (ER Modeling)

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Chen Notation (original): 1, N, M…

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Crow's Foot Notation (most…

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UML Notation: Numbers/ranges…

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Min-Max Notation: (min, max) pairs…

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Column Cardinality (Data Profiling)

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Cardinality ratio = (Distinct…

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Ratio close to 1.0 = High…

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Ratio close to 0.0 = Low…

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Example: 10 lakh rows ki table me…

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Cardinality SQL Query Optimization Me

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Example: WHERE status = 'active' —…

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Index scan ya full table scan?

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Nested loop join ya hash join ya…

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Sort in-memory ya disk-based?

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Cardinality Estimation Problems

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Problem: Table me bahut data…

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Impact: Optimizer purani…

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Fix: Regular ANALYZE TABLE…

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Problem: Data uniformly…

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Cardinality Different RDBMS Me

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Statistics storage:…

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Update command: ANALYZE TABLE…

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Histogram support: MySQL 8.0+ me…

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Estimation engine: InnoDB ka…

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Cardinality aur Indexing

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Primary keys, unique IDs, email…

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Index seek ek specific value…

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B-Tree index ideal hai high…

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Boolean columns (is_active: 0/1),…

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Real-World Examples

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Products table: product_id (high…

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Index strategy: B-Tree on…

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Query optimizer WHERE category =…

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Users table: user_id (high),…

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Best Practices

💡 1. Statistics updated rakho: Regular ANALYZE / UPDATE STATISTICS schedule banao.…

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Yeh Bhi Dekhiye

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SQL

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Database Normalization

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Index (database)

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Query Optimization

Diagram

Visual Flow

📊 Diagram visualization — details in narration

Quick Quiz

Quiz — Question 1

Cardinality ka sabse sahi definition kya hai?

Quick Quiz

Quiz — Question 2

Cardinality ka 'Concept Name' kya hai?

Complete! 🎉

Cardinality Complete!

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