Re: Count dates distinct within an interval
От | greg@turnstep.com |
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Тема | Re: Count dates distinct within an interval |
Дата | |
Msg-id | 7f2298d39c75726c835ecbf42f0c8e70@biglumber.com обсуждение исходный текст |
Ответ на | Count dates distinct within an interval (Dmitry Tkach <dmitry@openratings.com>) |
Ответы |
Re: Count dates distinct within an interval
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Список | pgsql-sql |
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 > Now, I want to count the occurences of each value of stuff in the table, > but so that entries within 24 hours from each other count as one... >... > A = 2001 - 01- 01 20:20:00 > B = 2001 - 01 - 02 20:19:00 > C = 2001 - 01 - 02 20:21:00 > Should be counted as *two* (A === B, and B === C, but *not* A === C)... You need to elaborate on your logic some more, and state exactly what you would want in the A,B,C case above. Does B get lumped with A or with C? It is within 24 hours of both, after all. Does C not get lumped in with B simply because B has already been lumped in with A? Perhaps showing us the sample output of an ideal query would be best, along with some sample rows (e.g. use real insert statements) - -- Greg Sabino Mullane greg@turnstep.com PGP Key: 0x14964AC8 200307151045 -----BEGIN PGP SIGNATURE----- Comment: http://www.turnstep.com/pgp.html iD8DBQE/FBS9vJuQZxSWSsgRAnk3AJ0bqyDk6iZWqSZuHfZslFCjxwl7fgCfaZ7r XdwpPsO4OaTa9YpjmXx1hmA= =IFRz -----END PGP SIGNATURE-----
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