NEWID( ) 

There are no parameters associated with the NEWID function.

UNIQUEIDENTIFIER

The NEWID function can be used in a DEFAULT clause for a column.

UUIDs can be used to uniquely identify rows in a table. A value produced on one computer does not match a value produced on another computer, so they can be used as keys in synchronization and replication environments.

• The NEWID default
• STRTOUUID function [String]
• UUIDTOSTR function [String]

The following statement creates a table named mytab with two columns. Column pk has a unique identifier data type, and assigns the NEWID function as the default value. Column c1 has an integer data type.

CREATE TABLE mytab( 
   pk UNIQUEIDENTIFIER PRIMARY KEY DEFAULT NEWID(), 
   c1 INT );

The following statement returns a unique identifier as a string:

SELECT UUIDTOSTR( NEWID() );

For example, the value returned might be 96603324-6FF6-49DE-BF7D-F44C1C7E6856.