Every second or third row

a statement SELECT Column FROM Table returns all elements of Column ...
is there any way to return only every second or every third or every ...-th element?

I don't know about other databases, but in Oracle every row has a pseudo-column ROWNUM that you can use to do this easily. For example, every other row ought to be:
SELECT Column FROM
(SELECT Column, rownum i FROM Table ORDER BY somethinguseful)
WHERE mod(i, 2) = 0

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    Attachments:
    Readfiles.vi ‏23 KB

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    Message was edited by:
    sinnex2004
    Message was edited by:
    sinnex2004
    Message was edited by:
    sinnex2004
    Message was edited by:
    sinnex2004
    Message was edited by:
    sinnex2004

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    Aug  6 09:53:22 MacBook-Air-van-Jos-2.local md5[4875]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:53:25 MacBook-Air-van-Jos-2.local md5[4876]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:53:25 MacBook-Air-van-Jos-2.local md5[4877]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:53:25 MacBook-Air-van-Jos-2.local md5[4878]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:53:26 MacBook-Air-van-Jos-2.local md5[4879]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:53:26 MacBook-Air-van-Jos-2.local md5[4880]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:53:26 MacBook-Air-van-Jos-2.local md5[4881]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:53:27 MacBook-Air-van-Jos-2.local md5[4882]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:53:27 MacBook-Air-van-Jos-2.local md5[4883]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:53:27 MacBook-Air-van-Jos-2.local md5[4884]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:53:28 MacBook-Air-van-Jos-2.local md5[4885]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:53:28 MacBook-Air-van-Jos-2.local md5[4886]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:53:28 MacBook-Air-van-Jos-2.local md5[4887]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:53:29 MacBook-Air-van-Jos-2.local md5[4888]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:53:29 MacBook-Air-van-Jos-2.local md5[4889]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:53:29 MacBook-Air-van-Jos-2.local md5[4890]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:53:30 MacBook-Air-van-Jos-2.local md5[4892]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:53:30 MacBook-Air-van-Jos-2.local md5[4893]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:53:30 MacBook-Air-van-Jos-2.local md5[4894]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:53:31 MacBook-Air-van-Jos-2.local md5[4895]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:53:31 MacBook-Air-van-Jos-2.local md5[4896]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:53:31 MacBook-Air-van-Jos-2.local md5[4897]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:53:32 MacBook-Air-van-Jos-2.local md5[4898]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:53:32 MacBook-Air-van-Jos-2.local md5[4899]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:53:32 MacBook-Air-van-Jos-2.local md5[4900]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:54:05 MacBook-Air-van-Jos-2.local md5[4930]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:54:40 MacBook-Air-van-Jos-2.local md5[5040]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:55:11 MacBook-Air-van-Jos-2.local md5[5141]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:57:07 MacBook-Air-van-Jos-2.local md5[5495]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:57:09 MacBook-Air-van-Jos-2.local md5[5496]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:57:13 MacBook-Air-van-Jos-2.local md5[5499]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:57:25 MacBook-Air-van-Jos-2.local md5[5509]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:57:26 MacBook-Air-van-Jos-2.local md5[5510]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:57:32 MacBook-Air-van-Jos-2.local md5[5514]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:57:33 MacBook-Air-van-Jos-2.local md5[5515]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:57:40 MacBook-Air-van-Jos-2.local md5[5517]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:57:41 MacBook-Air-van-Jos-2.local md5[5518]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:57:42 MacBook-Air-van-Jos-2.local md5[5519]: BUG in libdispatch: 12E55 - 1879 - 0x1b
    Aug  6 09:57:45 MacBook-Air-van-Jos-2.local md5[5523]: BUG in libdispatch: 12E55 - 1879 - 0x1b
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