Re: help on SQL
От | Gergely Czuczy |
---|---|
Тема | Re: help on SQL |
Дата | |
Msg-id | Pine.LNX.4.44.0404210941480.16994-100000@localhost обсуждение исходный текст |
Ответ на | Re: help on SQL (Kenneth Suralta <ksuralta@ntsp.nec.co.jp>) |
Список | pgsql-interfaces |
ahh, i see, you need every Nth result from the given query. I think there is no way for this, but getting all the result and dropping from the client every not-Nthm but i may be wrong On Wed, 21 Apr 2004, Kenneth Suralta wrote: > hi gergely, > > thanks for replying.. > what i mean is supposing there is a table with the following rows: > > data > ----- > 1 > 2 > 3 > 4 > 5 > 6 > 7 > > is it possible to get every other N-row in the table? > example, if N is 3. > data > ----- > 1 > 4 > 7 > > thanks, > kenneth > > > > Gergely Czuczy wrote: > > On Wed, 21 Apr 2004, Kenneth Suralta wrote: > > > > hello everyone, > > is it possible to get every other row in the table? > like for example: > data > ----- > 1 > 2 > 3 > 4 > 5 > 6 > 7 > > > SELECT t.fields FROM table t WHERE data NOT IN (SELECT t2.data FROM table > t2 WHERE some_whereclause); > > it will select these rows which ones are not in the subquery. but you can > do it simply by getting the negate of the whereclause... > > > Is it possible to have this result (interval of 3)? > > result > ------ > 1 > 4 > 7 > > > i don't see what you mean. please describe it. > > > thanks, > kenneth > > -- > > > > ---------------------------(end of broadcast)--------------------------- > TIP 4: Don't 'kill -9' the postmaster > > > > Bye, > > Gergely Czuczy > mailto: phoemix@harmless.hu > PGP: http://phoemix.harmless.hu/phoemix.pgp > > "Wish a god, a star, to believe in, > With the realm of king of fantasy..." > > > ---------------------------(end of broadcast)--------------------------- > TIP 2: you can get off all lists at once with the unregister command > (send "unregister YourEmailAddressHere" to majordomo@postgresql.org) > > > > > > -- > [IMAGE] > > Bye, Gergely Czuczy mailto: phoemix@harmless.hu PGP: http://phoemix.harmless.hu/phoemix.pgp "Wish a god, a star, to believe in, With the realm of king of fantasy..."
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