SQL DEFAULT Constraint Tutorial
Quick Answer
The SQL DEFAULT constraint assigns a default value to a column when no explicit value is provided during data insertion. It ensures data consistency and simplifies insert operations by automatically filling in missing values with predefined defaults.
Learning Objectives
- Understand the purpose and syntax of the SQL DEFAULT constraint.
- Learn how to apply DEFAULT constraints to table columns.
- Explore practical examples demonstrating DEFAULT constraint usage.
Introduction
In SQL, constraints are rules applied to table columns to enforce data integrity.
The DEFAULT constraint is a simple yet powerful tool that assigns a default value to a column when no explicit value is provided during data insertion.
A default value is a safety net for missing data.





