@@SPID (Transact-SQL)
Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Azure Synapse Analytics
Analytics Platform System (PDW)
Returns the session ID of the current user process.
Transact-SQL syntax conventions
Syntax
@@SPID
Return Types
smallint
Remarks
@@SPID can be used to identify the current user process in the output of sp_who.
Examples
This example returns the session ID, login name, and user name for the current user process.
SELECT @@SPID AS 'ID', SYSTEM_USER AS 'Login Name', USER AS 'User Name';
Here's the result set.
ID Login Name User Name
------ ------------------------------ ------------------------------
54 SEATTLE\joanna dbo
Examples: Azure Synapse Analytics and Analytics Platform System (PDW)
This example returns the Azure Synapse Analytics session ID, the SQL Server Control node session ID, login name, and user name for the current user process.
SELECT SESSION_ID() AS ID, @@SPID AS 'Control ID', SYSTEM_USER AS 'Login Name', USER AS 'User Name';