Unique Key Sql Server

Both primary key and unique key enforces the uniqueness of the values (i.e. avoids duplicate values) on the column[s] on which it is defined. also these key’s can uniquely identify each row in database table. [also read] difference between sql server varchar and nvarchar data type below table lists out the major difference between primary key and unique key:. Sql server: unique constraints this sql server tutorial explains how to create, add, and drop unique constraints in sql server with syntax and examples.. what is a unique constraint in sql server? a unique constraint is a single field or combination of fields that uniquely defines a record.. The unique key and primary key both provide a guarantee for uniqueness for a field/column or a set of fields/columns. a unique key in sql server is uniquely identify a record in a database table. it can have one or more than one fields/columns in a table..

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