Answer 1

Answer 2

INSERT T DEFAULT VALUES 

或者插入多行（使用spt_values表一次最多2048行）

SET IDENTITY_INSERT t ON
INSERT INTO t (id) 
SELECT Number + COALESCE(IDENT_CURRENT('t'),0) + 1
FROM master.dbo.spt_values
where type='p' and number < 2048
SET IDENTITY_INSERT t OFF

Answer 3

INSERT INTO <tablename> DEFAULT VALUES;