In this article, I will discuss Constraints in SQL Server with examples. Please read our previous article where we discussed SQL Server Data Types in detail. As part of this article. we are going to ...

Unique constraints, however, can have *one* NULL value (just like they can have *one* of any other value) Second, you can only have one primary key constraint on a table. Conversely, you can have as ...

The DEFAULT constraint is used to set a default value for a column. This default value is automatically assigned when no value is provided during an insert operation.

The CHECK constraint limits the value range that can be placed in a column. It ensures only specific values are accepted either on a single column or based on conditions across multiple columns.