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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