Create Table MyTable

(

mainkey int not null identity (-1,-1)

)

GO

insert into MyTable default values

insert into MyTable default values

insert into MyTable default values

Select * from MyTable

== > ok in...

in identity (-1,1) no first paramaeter shows number start from and second parameter shows number increment by mentioned. in that case "mainkey" will start from -1 and increased by 1....