Web Reference: Nov 18, 2025 · This article shows you how to create unique constraints using SQL Server Management Studio and Transact-SQL. What you're looking for is indeed part of the ANSI standards SQL:92, SQL:1999 and SQL:2003, i.e., a UNIQUE constraint must disallow duplicate non-NULL values but accept multiple NULL values. In Microsoft SQL Server, however, a single NULL is allowed, but multiple NULLs are not. This SQL Server tutorial explains how to create, add, and drop unique constraints in SQL Server with syntax and examples. A unique constraint is a single field or combination of fields that uniquely defines a record.
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