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SQL Episode 2 – The Rules (Constraints)
SQL Episode 2 – The Rules (Constraints)
Don't let your database become a mess! In this video, we explore SQL Constraints—the rules that keep your data clean, unique, and connected.
________________________________________
🛠️ PRACTICE TASK: Identify the Constraint!
Which constraint would you use for the following scenarios? Post your answers below! 👇
1. To ensure every user has a unique, non-empty ID number.
2. To make sure a "Course_ID" in the Enrollments table exists in the Courses table.
3. To ensure an "Email" column never has the same address twice.
4. To automatically set the "Country" to 'USA' if no value is provided.
________________________________________
🚀 JOIN THE TECHTHRIVEX COMMUNITY
• Subscribe for step-by-step tech upgrades.
• Roadmap Video: https://youtu.be/Gn5Boq6MSgk?si=UkAogHfDovL-7sAG
• Previous Video (DDL/DML/DQL): https://youtu.be/dUfuLPWcCI0?si=E4UW-9pCgOydmVsK
#SQL #DataIntegrity #TechThriveX #PrimaryKey #ForeignKey #DatabaseDesign #2026TechSkills
Видео SQL Episode 2 – The Rules (Constraints) канала TechThriveX
Don't let your database become a mess! In this video, we explore SQL Constraints—the rules that keep your data clean, unique, and connected.
________________________________________
🛠️ PRACTICE TASK: Identify the Constraint!
Which constraint would you use for the following scenarios? Post your answers below! 👇
1. To ensure every user has a unique, non-empty ID number.
2. To make sure a "Course_ID" in the Enrollments table exists in the Courses table.
3. To ensure an "Email" column never has the same address twice.
4. To automatically set the "Country" to 'USA' if no value is provided.
________________________________________
🚀 JOIN THE TECHTHRIVEX COMMUNITY
• Subscribe for step-by-step tech upgrades.
• Roadmap Video: https://youtu.be/Gn5Boq6MSgk?si=UkAogHfDovL-7sAG
• Previous Video (DDL/DML/DQL): https://youtu.be/dUfuLPWcCI0?si=E4UW-9pCgOydmVsK
#SQL #DataIntegrity #TechThriveX #PrimaryKey #ForeignKey #DatabaseDesign #2026TechSkills
Видео SQL Episode 2 – The Rules (Constraints) канала TechThriveX
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26 марта 2026 г. 18:26:50
00:08:02
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