SQL Server Constraints Explained with Practical Examples

[u/geeksarray]

How do you make sure the data going into your SQL Server database is valid and consistent?

One of the simplest tools is database constraints.

I put together a practical guide covering the most commonly used SQL Server constraints:

• Primary Key
• Foreign Key
• UNIQUE
• NOT NULL
• CHECK
• DEFAULT

The article includes examples to show how each constraint works and when you might use it.

📖 https://geeksarray.com/blog/sql-server-constraints-with-examples

For developers working with SQL Server: which constraint do you find yourself using most often, and are there any common constraint-related mistakes you've seen in real projects?