C guid and SQL uniqueidentifier
And in Entity Framework, Database first method, a uniqueidentifier SQL datatype (recommended in comment by @TorHaugen) translates to a System. Guid C# datatype , which is what OP asked about
uniqueidentifier (Transact-SQL) Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW) SQL analytics endpoint in Microsoft Fabric Warehouse in Microsoft Fabric SQL database in Microsoft Fabric Is a 16-byte GUID .
Comparing GUID and uniqueidentifier values
Download ADO.NET The globally unique identifier ( GUID ) data type in SQL Server is represented by the uniqueidentifier data type, which stores a 16-byte binary value. A GUID is a binary number, and its main use is as an identifier that must be unique in a network that has many computers at many sites. GUIDs can be generated by calling the Transact-SQL NEWID function, and is guaranteed to be ...
Performance wise, normal GUID is slower than INT in SQL Server If you plan to use GUID , use uniqueidentifier instead of varchar as data type. Microsoft did not mention how they implement it, there is some speed optimization when you use uniqueidentifier as the data type.
UNIQUEIDENTIFIER data type
UNIQUEIDENTIFIER values are stored as BINARY (16), but are described to client applications as BINARY (36). This description ensures that if the client fetches the value as a string, it has allocated enough space for the result. For ODBC client applications, uniqueidentifier values appear as a SQL_GUID type.
The UNIQUEIDENTIFIER data type in SQL Server holds 16-byte autogenerated GUID numbers. GUIDs are a globally unique identifiers that are commonly used as primary key values.
Understanding the GUID data type in SQL Server
What is a GUID ? GUID is a 16 byte binary SQL Server data type that is globally unique across tables, databases, and servers. The term GUID stands for Globally Unique Identifier and it is used interchangeably with UNIQUEIDENTIFIER . To create a GUID in SQL Server, the NEWID () function is used as shown below:
In SQL Server, UNIQUEIDENTIFIER is a data type used to store a globally unique identifier ( GUID ). A GUID is a binary value generated by an algorithm, typically used as a unique identifier in distributed systems.
Key Details About Datatype Uniqueidentifier Guid Datatypes
The data type uuid stores Universally Unique Identifiers (UUID) as defined by RFC 9562, ISO/IEC 9834-8:2005, and related standards. (Some systems refer to this data type as a globally unique identifier, or GUID , instead.) This identifier is a 128-bit quantity that is generated by an algorithm chosen to make it very unlikely that the same identifier will be generated by anyone else in the known ...
