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.
This feature has changed from earlier versions of SQL Server. For more information, see Behavior Changes to Database Engine Features in SQL Server 2012.
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.
CREATE TABLE 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)); GO