staggered query?

hi! im new to SQL, and i need to find a solution
to this problem:

i have a table with two columns, the first column
is of type timestamp.

the table contains hundreds of thousands of records.
i need to get all the entries/records  at every 10 seconds
interval.  example, given a table:

hh/mm/ss | data
---------------
00:00:00   1
00:00:01   2
00:00:02   3
00:00:03   4
00:00:04   5
00:00:05   6
00:00:06   7
00:00:07   8
..
..

my query should return:
00:00:10
00:00:20
00:00:30
(etc)

is this possible? if yes, how do i do it?

thanks!

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