How to insert into a table with just one IDENTITY column?

(Came up with this question in the course of trying to answer this other one)

Consider the following MS-SQL table, called GroupTable:

GroupID
-------
1  
2  
3  

where GroupID is the primary key and is an Identity column.

How do you insert a new row into the table (and hence generate a new ID) without using IDENTITY_INSERT ON?

Note that this:

INSERT INTO GroupTable() Values ()   

... won't work.

edit: we're talking SQL 2005 or SQL 2008 here.

Solution 1:

This should work:

INSERT INTO GroupTable DEFAULT VALUES 

Solution 2:

Here you go:

INSERT INTO GroupTable DEFAULT VALUES

Solution 3:

It is possible to insert more than one row at a time.

For e.g., to insert 30 rows. INSERT INTO GroupTable DEFAULT VALUES GO 30

This will insert 30 rows by incrementing the identity column each time.