Do Inserted Records Always Receive Contiguous Identity Values

Question

Consider the following SQL:

CREATE TABLE Foo
(
    ID int IDENTITY(1,1),
    Data nvarchar(max)
)

INSERT INTO Foo (Data)
SELECT TOP 1000 Data
FROM SomeOther         


        

Answer 1

It is not good practice to attach any sort of meaning whatsoever to identity values. You should assume that they are nothing more than integers guaranteed to be unique within the scope of your table.