HOST_ID (Transact-SQL)

APPLIES TO: yesSQL Server noAzure SQL Database noAzure Synapse Analytics (SQL DW) noParallel Data Warehouse

Returns the workstation identification number. The workstation identification number is the process ID (PID) of the application on the client computer that is connecting to SQL Server.

Topic link icon Transact-SQL Syntax Conventions


HOST_ID ()  

Return Types



When the parameter to a system function is optional, the current database, host computer, server user, or database user is assumed. Built-in functions must always be followed by parentheses.

System functions can be used in the select list, in the WHERE clause, and anywhere an expression is allowed.


The following example creates a table that uses HOST_ID() in a DEFAULT definition to record the terminal ID of computers that insert rows into a table recording orders.

   (OrderID     int       PRIMARY KEY,  
    CustomerID  nchar(5)  REFERENCES Customers(CustomerID),  
    TerminalID  char(8)   NOT NULL DEFAULT HOST_ID(),  
    OrderDate   datetime  NOT NULL,  
    ShipDate    datetime  NULL,  
    ShipperID   int       NULL REFERENCES Shippers(ShipperID));  

See Also

Expressions (Transact-SQL)
System Functions (Transact-SQL)