SQL Roadmap Episode 6 — Data Constraints Explained | PRIMARY KEY, FOREIGN KEY, UNIQUE, NOT NULL, etc
Welcome to Episode 6 of the SQL Roadmap Series
In this video, we'll learn about Data Constraints in SQL and how databases enforce rules to maintain data integrity, consistency, and reliability.
Constraints help prevent invalid data from entering tables and ensure that relationships between tables remain accurate.
We'll cover:
• NOT NULL Constraint
• UNIQUE Constraint
• PRIMARY KEY Constraint
• FOREIGN KEY Constraint
• DEFAULT Constraint
• CHECK Constraint
We'll also understand:
• Why constraints are important
• How databases prevent duplicate data
• How PRIMARY KEY and FOREIGN KEY work
• How relationships between tables are enforced
• How constraints improve data quality and integrity
This video is designed specifically for beginners starting their journey in:
• SQL
• Backend Development
• Data Science
• Data Engineering
• Software Engineering
We'll create tables from scratch and see how different constraints protect our database from invalid or inconsistent data.
By the end of this video, you'll understand how professional databases maintain accurate and trustworthy information.
Software Used:
• MySQL
• MySQL Workbench
Topics Covered:
• NOT NULL
• UNIQUE
• PRIMARY KEY
• FOREIGN KEY
• DEFAULT
• CHECK
• Data Integrity
• Referential Integrity
This series will eventually cover:
• Aggregate Functions
• Joins
• Keys
• Normalization
• Functions
• Subqueries
• Indexing
• Transactions
• Views
• Stored Procedures
• Advanced SQL
and much more.
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Roadmap : https://www.notion.so/SQL-Roadmap-35a...
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