Day 4: Creating Tables – Data Types, NULL, and DEFAULT Constraints

📰 Dev.to · CodeWithDhanian

Learn to create tables in a relational database with proper data types, NULL, and DEFAULT constraints

beginner Published 24 May 2026

Action Steps

Create a table using SQL with specific data types for each column
Define NULL or NOT NULL constraints for columns to handle missing data
Apply DEFAULT constraints to columns to provide default values
Test the table creation with sample data to verify constraints
Modify the table structure as needed to accommodate changing data requirements

Who Needs to Know This

Database administrators, backend developers, and data analysts can benefit from understanding how to create tables with appropriate constraints to ensure data consistency and integrity

Key Insight

💡 Proper table creation with data types, NULL, and DEFAULT constraints is crucial for maintaining data integrity and consistency in relational databases