Wiki Article · Cinematic

Referential Integrity

Referential Integrity (RI) ek database rule hai jo ensure karta hai ke child table me jo reference…

Overview

Referential Integrity — Quick Facts

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Property: Detail

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Topic: Referential Integrity

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Type: Database Constraint / Data Quality…

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Purpose: Ensure child records always…

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Infobox

📚 | Property | Detail | |---|---| | Topic | Referential Integrity | | Type | Database…

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Why Referential Integrity Matters

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RI guarantee karta hai ke har…

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Iske bina data me "holes" aa jaate…

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Orphan record = child record jiska…

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Orphan records queries ko corrupt…

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Foreign Key Constraint

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FK constraint bilkul strict hai —…

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Multiple child tables ek parent…

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FK indexed hona chahiye…

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FK ka data type parent PK ke data…

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ON DELETE and ON UPDATE Actions

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CASCADE: Jab child records parent…

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RESTRICT: Jab parent delete risky…

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SET NULL: Jab child independent…

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SET DEFAULT: Rare — jab meaningful…

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Referential Integrity Violations

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Example: INSERT INTO Orders…

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Example: Customer delete karo jab…

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Example: Customer ID 55 ko 56 bana…

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Data inconsistency — queries wrong…

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Enforcement Levels

✨ `mermaid flowchart TD subgraph DB["🗄️ Database Level"] FK["Foreign Key Constraints"]…

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RI in Data Warehousing and Analytics

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Data warehouses (Snowflake,…

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Star schema me fact table →…

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Yeh "soft RI" ya "logical RI" hai…

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ETL bugs se orphan facts create ho…

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RI in NoSQL and Non-Relational Systems

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MongoDB, DynamoDB, Cassandra,…

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Document databases me data…

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Referential integrity application…

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Tradeoff: data duplication, update…

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Common Pitfalls

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Table A → Table B → Table A…

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Fix: Ek FK nullable rakho, staged…

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ON DELETE CASCADE deeply nested…

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1 customer delete = 1000 orders…

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Best Practices

💡 1. FK constraints hamesha define karo — database level pe enforcement best hai 2. ON…

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Real-World Examples

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Orders.customer_id → Customers.id…

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Order_Items.order_id → Orders.id —…

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Order_Items.product_id →…

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Violation: Customer delete karo…

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Glossary

⭐ | # | Term | Meaning | |---|---|---| | 1 | Referential Integrity | Rule ke child record…

Diagram

Visual Flow

📊 Diagram visualization — details in narration

Quiz — Question 1

Referential Integrity ka sabse sahi definition kya hai?

Quick Quiz

Quiz — Question 2

Referential Integrity ka 'Topic' kya hai?

Complete! 🎉

Referential Integrity Complete!

Aliens Wiki · Hinglish · Cinematic Knowledge

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Referential Integrity Complete

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