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Skill Topic ยท Cinematic

๐Ÿ“˜ MySQL Constraints

Data integrity ensure karo โ€” rules jo database enforce kare! ๐Ÿ›ก๏ธ

Topic 1
๐Ÿ“ฅ ๐Ÿ“ฅ ๐Ÿง  ๐Ÿ”ฌ ๐Ÿ’ก ๐ŸŽฏ

๐Ÿ“Œ 1. Constraints Overview

๐Ÿค– ` 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”€โ”€โ”€โ”€โ” โ”‚ CONSTRAINTS โ”‚ โ”‚ โ”‚ โ”‚ NOTโ€ฆ
Topic 2
๐Ÿง  ๐Ÿ“Š ๐Ÿ”ฌ

๐Ÿ“Œ 2. NOT NULL

๐Ÿง  `sql -- 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• -- NOT NULL โ€” empty allowed nahi --โ€ฆ
Topic 3
๐Ÿ”’

๐Ÿ“Œ 3. UNIQUE

๐Ÿ’ก `sql -- 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• -- UNIQUE โ€” duplicate not allowed --โ€ฆ
Topic 4
โšก

๐Ÿ“Œ 4. PRIMARY KEY

โšก `sql -- 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• -- PRIMARY KEY = NOT NULL + UNIQUE --โ€ฆ
Topic 5
๐Ÿ“ฅ ๐Ÿ“ฅ ๐Ÿง  ๐Ÿ”ฌ ๐Ÿ’ก ๐ŸŽฏ

๐Ÿ“Œ 5. FOREIGN KEY

๐ŸŽฏ `sql -- 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• -- FOREIGN KEY โ€” tables ka relation --โ€ฆ
Topic 6
๐Ÿ”ฎ ๐Ÿ“Š ๐Ÿ”ฌ

๐Ÿ“Œ 6. ON DELETE / ON UPDATE Actions

๐Ÿ”ฎ `sql -- 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• -- Foreign Key Actions --โ€ฆ
Topic 7
๐Ÿ”’

๐Ÿ“Œ 7. CHECK Constraint

๐ŸŒ `sql -- 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• -- CHECK โ€” value validation --โ€ฆ
Topic 8
๐Ÿ“Š

๐Ÿ“Œ 8. DEFAULT

๐Ÿ“Š `sql -- 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• -- DEFAULT โ€” automatic values --โ€ฆ
Topic 9
๐Ÿ“ฅ ๐Ÿ“ฅ ๐Ÿง  ๐Ÿ”ฌ ๐Ÿ’ก ๐ŸŽฏ

๐Ÿ“Œ 9. Practical โ€” Complete Schema

๐Ÿค– `sql -- 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• -- E-commerce Schema (all constraints) --โ€ฆ
Topic 10
๐Ÿง  ๐Ÿ“Š ๐Ÿ”ฌ

โœ… Summary

๐Ÿง  KEY POINTS: - NOT NULL = empty/NULL block, required field banao - UNIQUE = duplicatesโ€ฆ
Quick Quiz
๐Ÿง  QUIZ TIME

Quiz โ€” Question 1

๐Ÿ“˜ MySQL Constraints ka sabse sahi definition kya hai?

Complete! ๐ŸŽ‰
COMPLETE

๐Ÿ“˜ MySQL Constraints Complete!

Aliens School ยท HIEN ยท Cinematic Knowledge

โœ…

๐Ÿ“˜ MySQL Constraints Complete

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