Skill Topic · Cinematic

📘 SQL CHECK - Custom Condition Lagana

CHECK constraint se tum column pe apni custom rule laga sakte ho — sirf valid data hi database me…

Overview

📘 SQL CHECK - Custom Condition Lagana — Quick Facts

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Method: Where

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CHECK: Database level

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Trigger: Database level

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Application Code: App level

Topic 1

📌 CHECK Kya Hai?

📚 CHECK constraint ek custom condition define karta hai jo har INSERT ya UPDATE pe check…

Topic 2

📌 CHECK in CREATE TABLE

💡 Column Level: `sql CREATE TABLE Employees ( EmpID INT PRIMARY KEY, Name VARCHAR(100) NOT…

Topic 3

📌 Test Examples

🎯 `sql -- ✅ Works: Age 25 >= 18 INSERT INTO Employees VALUES (1, 'Anil', 25, 50000); -- ❌…

Topic 4

📌 Multiple Conditions in CHECK

⭐ `sql CREATE TABLE Products ( ProductID INT PRIMARY KEY, ProductName VARCHAR(200) NOT…

Topic 5

📌 CHECK with IN / BETWEEN / LIKE

🔑 `sql CREATE TABLE Orders ( OrderID INT PRIMARY KEY, Status VARCHAR(20), Priority INT,…

Topic 6

📌 Cross-Column CHECK

✨ `sql CREATE TABLE Events ( EventID INT PRIMARY KEY, EventName VARCHAR(200), StartDate…

Topic 7

📌 ALTER TABLE se CHECK Add/Drop

🌟 Add: `sql -- Add CHECK constraint ALTER TABLE Employees ADD CONSTRAINT chk_age CHECK (Age…

Topic 8

📌 CHECK — Enable/Disable (SQL Server)

🚀 `sql -- SQL Server: Temporarily disable ALTER TABLE Employees NOCHECK CONSTRAINT chk_age;…

Topic 9

📌 CHECK vs Other Validation Methods

Topic 10

📌 Common CHECK Patterns

💡 `sql -- Email format (basic): CHECK (Email LIKE '%_@_%.__%') -- Phone number (digits…

Topic 11

📌 Database Compatibility

Topic 12

✅ Summary

⭐ KEY POINTS: - CHECK constraint custom condition define karta hai (Age >= 18, Price > 0) -…

Comparison

📌 CHECK vs Other Validation Methods

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CHECK: Database level

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Trigger: Database level

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Application Code: App level

Quick Quiz

Quiz — Question 1

📘 SQL CHECK - Custom Condition Lagana ka sabse sahi definition kya hai?

Quick Quiz

Quiz — Question 2

📘 SQL CHECK - Custom Condition Lagana ka 'CHECK' kya hai?

Complete! 🎉

📘 SQL CHECK - Custom Condition Lagana Complete!

Aliens School · HIEN · Cinematic Knowledge

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