There are no "consecutive rows". The data stored in a table is abstracted from any concrete order. The order only appears as a result of some query, and then you can control it, say, using SQL
ORDER BY
clause:
http://technet.microsoft.com/en-us/library/ms188723%28v=sql.90%29.aspx[
^].
Therefore, the question makes no sense. You can probably get some practical advice if you explain your ultimate goal.
—SA