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 .
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.
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