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-From owner-pgsql-sql@hub.org Sat Jul 10 16:31:14 1999
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-Date: Sun, 11 Jul 1999 00:16:39 +0400 (MSD)
-From: Oleg Bartunov <oleg@sai.msu.su>
-X-Sender: megera@ra
-Reply-To: Oleg Bartunov <oleg@sai.msu.su>
-To: hackers@postgreSQL.org
-cc: pgsql-sql@postgreSQL.org
-Subject: [SQL] SELECT DISTINCT question
-Message-ID: <Pine.GSO.3.96.SK.990711000908.2043R-100000@ra>
-Organization: Sternberg Astronomical Institute (Moscow University)
-MIME-Version: 1.0
-Content-Type: TEXT/PLAIN; charset=US-ASCII
-Sender: owner-pgsql-sql@postgreSQL.org
-Precedence: bulk
-Status: RO
-
-I got a problem with query:
-
-select distinct (date), bytes from access_log;
-
-which works but not as I expect. I thought this query will select
-all rows with distinct values of 'date' column, but it get
-distinct pairs 'date, bytes' . From documnetation I see
-
-"DISTINCT will eliminate all duplicate rows from the selection.
-DISTINCT ON column will eliminate all duplicates in the specified column;
-this is equivalent to using GROUP BY column.
-ALL will return all candidate rows, including duplicates."
-
-discovery=> select distinct on date,bytes from access_log;
-ERROR: parser: parse error at or near ","
-
- Regards,
-
- Oleg
-_____________________________________________________________
-Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
-Sternberg Astronomical Institute, Moscow University (Russia)
-Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
-phone: +007(095)939-16-83, +007(095)939-23-83
-
-
-
-
-From owner-pgsql-sql@hub.org Sat Jul 10 18:01:17 1999
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- Sat, 10 Jul 1999 17:18:28 -0400 (EDT)
-To: Oleg Bartunov <oleg@sai.msu.su>
-cc: hackers@postgreSQL.org, pgsql-sql@postgreSQL.org
-Subject: [SQL] Re: [HACKERS] SELECT DISTINCT question
-In-reply-to: Your message of Sun, 11 Jul 1999 00:16:39 +0400 (MSD)
- <Pine.GSO.3.96.SK.990711000908.2043R-100000@ra>
-Date: Sat, 10 Jul 1999 17:18:28 -0400
-Message-ID: <5707.931641508@sss.pgh.pa.us>
-From: Tom Lane <tgl@sss.pgh.pa.us>
-Sender: owner-pgsql-sql@postgreSQL.org
-Precedence: bulk
-Status: RO
-
-Oleg Bartunov <oleg@sai.msu.su> writes:
-> discovery=> select distinct on date,bytes from access_log;
-> ERROR: parser: parse error at or near ","
-
-The syntax for SELECT DISTINCT ON is just as brain-damaged as the
-functionality itself: there's no comma after the column name.
-You want
-
-select distinct on date date,bytes from access_log;
-
-The reason the functionality is brain-damaged is that there's no way to
-know which tuple out of the set of tuples with a given "date" value will
-be the one returned.
-
-SELECT DISTINCT ON is not in SQL92, and I think it shouldn't be in
-Postgres either...
-
- regards, tom lane
-
-
-From owner-pgsql-sql@hub.org Sun Jul 11 12:01:23 1999
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-Date: Sun, 11 Jul 1999 10:09:24 +0400 (MSD)
-From: Oleg Bartunov <oleg@sai.msu.su>
-X-Sender: megera@ra
-To: Tom Lane <tgl@sss.pgh.pa.us>
-cc: hackers@postgreSQL.org, pgsql-sql@postgreSQL.org
-Subject: Re: [SQL] Re: [HACKERS] SELECT DISTINCT question
-In-Reply-To: <5707.931641508@sss.pgh.pa.us>
-Message-ID: <Pine.GSO.3.96.SK.990711100405.2043V-100000@ra>
-Organization: Sternberg Astronomical Institute (Moscow University)
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-
-On Sat, 10 Jul 1999, Tom Lane wrote:
-
-> Date: Sat, 10 Jul 1999 17:18:28 -0400
-> From: Tom Lane <tgl@sss.pgh.pa.us>
-> To: Oleg Bartunov <oleg@sai.msu.su>
-> Cc: hackers@postgreSQL.org, pgsql-sql@postgreSQL.org
-> Subject: [SQL] Re: [HACKERS] SELECT DISTINCT question
->
-> Oleg Bartunov <oleg@sai.msu.su> writes:
-> > discovery=> select distinct on date,bytes from access_log;
-> > ERROR: parser: parse error at or near ","
->
-> The syntax for SELECT DISTINCT ON is just as brain-damaged as the
-> functionality itself: there's no comma after the column name.
-> You want
->
-> select distinct on date date,bytes from access_log;
->
-
-thanks, this works. But why parser complains about such query:
-
-discovery=> select distinct on a.date a.date, a.bytes from access_log a;
-ERROR: parser: parse error at or near "."
-
-In this query I could just omit '.', but in more complex query
-I probably could need one.
-
-> The reason the functionality is brain-damaged is that there's no way to
-> know which tuple out of the set of tuples with a given "date" value will
-> be the one returned.
->
-> SELECT DISTINCT ON is not in SQL92, and I think it shouldn't be in
-> Postgres either...
-
-
-I'm not an SQL expert, but if it works and this feature is in standard
-but only syntax is diffrent, why just not to use standard
-
-select distinct(date), bytes from access_log;
-
-Or I'm missing here ?
-
-
- Regards,
- Oleg
->
-> regards, tom lane
->
-
-_____________________________________________________________
-Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
-Sternberg Astronomical Institute, Moscow University (Russia)
-Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
-phone: +007(095)939-16-83, +007(095)939-23-83
-
-
-
-From owner-pgsql-hackers@hub.org Sun Jul 11 12:01:26 1999
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-Date: Sun, 11 Jul 1999 10:09:24 +0400 (MSD)
-From: Oleg Bartunov <oleg@sai.msu.su>
-X-Sender: megera@ra
-To: Tom Lane <tgl@sss.pgh.pa.us>
-cc: hackers@postgreSQL.org, pgsql-sql@postgreSQL.org
-Subject: Re: [SQL] Re: [HACKERS] SELECT DISTINCT question
-In-Reply-To: <5707.931641508@sss.pgh.pa.us>
-Message-ID: <Pine.GSO.3.96.SK.990711100405.2043V-100000@ra>
-Organization: Sternberg Astronomical Institute (Moscow University)
-MIME-Version: 1.0
-Content-Type: TEXT/PLAIN; charset=US-ASCII
-Sender: owner-pgsql-hackers@postgreSQL.org
-Precedence: bulk
-Status: RO
-
-On Sat, 10 Jul 1999, Tom Lane wrote:
-
-> Date: Sat, 10 Jul 1999 17:18:28 -0400
-> From: Tom Lane <tgl@sss.pgh.pa.us>
-> To: Oleg Bartunov <oleg@sai.msu.su>
-> Cc: hackers@postgreSQL.org, pgsql-sql@postgreSQL.org
-> Subject: [SQL] Re: [HACKERS] SELECT DISTINCT question
->
-> Oleg Bartunov <oleg@sai.msu.su> writes:
-> > discovery=> select distinct on date,bytes from access_log;
-> > ERROR: parser: parse error at or near ","
->
-> The syntax for SELECT DISTINCT ON is just as brain-damaged as the
-> functionality itself: there's no comma after the column name.
-> You want
->
-> select distinct on date date,bytes from access_log;
->
-
-thanks, this works. But why parser complains about such query:
-
-discovery=> select distinct on a.date a.date, a.bytes from access_log a;
-ERROR: parser: parse error at or near "."
-
-In this query I could just omit '.', but in more complex query
-I probably could need one.
-
-> The reason the functionality is brain-damaged is that there's no way to
-> know which tuple out of the set of tuples with a given "date" value will
-> be the one returned.
->
-> SELECT DISTINCT ON is not in SQL92, and I think it shouldn't be in
-> Postgres either...
-
-
-I'm not an SQL expert, but if it works and this feature is in standard
-but only syntax is diffrent, why just not to use standard
-
-select distinct(date), bytes from access_log;
-
-Or I'm missing here ?
-
-
- Regards,
- Oleg
->
-> regards, tom lane
->
-
-_____________________________________________________________
-Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
-Sternberg Astronomical Institute, Moscow University (Russia)
-Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
-phone: +007(095)939-16-83, +007(095)939-23-83
-
-
-
-From owner-pgsql-sql@hub.org Sun Jul 11 12:01:16 1999
-Received: from renoir.op.net (root@renoir.op.net [209.152.193.4])
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- Sun, 11 Jul 1999 11:38:44 -0400 (EDT)
-To: Oleg Bartunov <oleg@sai.msu.su>
-cc: hackers@postgreSQL.org, pgsql-sql@postgreSQL.org
-Subject: Re: [SQL] Re: [HACKERS] SELECT DISTINCT question
-In-reply-to: Your message of Sun, 11 Jul 1999 10:09:24 +0400 (MSD)
- <Pine.GSO.3.96.SK.990711100405.2043V-100000@ra>
-Date: Sun, 11 Jul 1999 11:38:43 -0400
-Message-ID: <15129.931707523@sss.pgh.pa.us>
-From: Tom Lane <tgl@sss.pgh.pa.us>
-Sender: owner-pgsql-sql@postgreSQL.org
-Precedence: bulk
-Status: RO
-
-Oleg Bartunov <oleg@sai.msu.su> writes:
-> thanks, this works. But why parser complains about such query:
-
-> discovery=> select distinct on a.date a.date, a.bytes from access_log a;
-> ERROR: parser: parse error at or near "."
-
-Probably the grammar specifies just <column name> and not anything
-more complex after DISTINCT ON. It'd be risky to try to accept a
-general expression after ON, due to the silly decision to leave out
-any terminating punctuation.
-
->> SELECT DISTINCT ON is not in SQL92, and I think it shouldn't be in
->> Postgres either...
-
-> I'm not an SQL expert, but if it works and this feature is in standard
-> but only syntax is diffrent,
-
-No, there is no feature in SQL that allows DISTINCT on a subset of
-columns, period. This is not merely a matter of syntax, it's a
-fundamental semantic issue.
-
-> why just not to use standard
->
-> select distinct(date), bytes from access_log;
->
-> Or I'm missing here ?
-
-I don't think that does what you expect it to (hint: the
-parentheses are redundant).
-
- regards, tom lane
-
-
-From owner-pgsql-sql@hub.org Tue Jul 13 18:02:01 1999
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- Tue, 13 Jul 1999 17:31:49 -0400 (EDT)
-To: Hannu Krosing <hannu@trust.ee>
-cc: hackers@postgreSQL.org, pgsql-sql@postgreSQL.org
-Subject: [SQL] Re: [HACKERS] SELECT DISTINCT question
-In-reply-to: Your message of Tue, 13 Jul 1999 23:50:57 +0300
- <378BA6B1.2B226DDB@trust.ee>
-Date: Tue, 13 Jul 1999 17:31:48 -0400
-Message-ID: <24413.931901508@sss.pgh.pa.us>
-From: Tom Lane <tgl@sss.pgh.pa.us>
-Sender: owner-pgsql-sql@postgreSQL.org
-Precedence: bulk
-Status: ROr
-
-Hannu Krosing <hannu@trust.ee> writes:
->> "DISTINCT will eliminate all duplicate rows from the selection.
->> DISTINCT ON column will eliminate all duplicates in the specified column;
->> this is equivalent to using GROUP BY column."
-
-> If it is equivalent to GROUP BY then it should allow only aggregates
-> in non-distinct columns, like:
-> select distinct on date date, sum(bytes) from access_log;
-> If it does not, then it should be files as a bug imho.
-
-It does not. Whether that is a bug is hard to say, since there is no
-standard I know of that says what it *is* supposed to do.
-
-If you look at the select_distinct_on regress test outputs, I bet you
-will be even less happy:
-
-QUERY: SELECT DISTINCT ON string4 two, string4, ten
- FROM tmp
- ORDER BY two using <, string4 using <, ten using <;
-two|string4|ten
----+-------+---
- 0|AAAAxx | 0
- 0|HHHHxx | 0
- 0|OOOOxx | 0
- 0|VVVVxx | 0
- 1|AAAAxx | 1
- 1|HHHHxx | 1
- 1|OOOOxx | 1
- 1|VVVVxx | 1
-(8 rows)
-
-That's not exactly my idea of "distinct" values of string4 ---
-but apparently whoever made up the regress test thought it was OK!
-
-Can anyone defend this feature or provide a coherent definition
-of what it's supposed to be doing? My urge to rip it out is
-growing stronger and stronger...
-
- regards, tom lane
-
-
-From tgl@sss.pgh.pa.us Thu Sep 23 17:27:49 1999
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- Thu, 23 Sep 1999 17:27:38 -0400 (EDT)
-To: Bruce Momjian <maillist@candle.pha.pa.us>
-cc: Hannu Krosing <hannu@trust.ee>, hackers@postgreSQL.org,
- pgsql-sql@postgreSQL.org
-Subject: Re: [SQL] Re: [HACKERS] SELECT DISTINCT question
-In-reply-to: Your message of Thu, 23 Sep 1999 13:18:18 -0400 (EDT)
- <199909231718.NAA19629@candle.pha.pa.us>
-Date: Thu, 23 Sep 1999 17:27:37 -0400
-Message-ID: <15767.938122057@sss.pgh.pa.us>
-From: Tom Lane <tgl@sss.pgh.pa.us>
-Status: ROr
-
-Bruce Momjian <maillist@candle.pha.pa.us> writes:
-> Tom, any status on this DISTINCT ON ripout?
-
-I haven't done anything about it, if that's what you mean.
-
-I didn't get any indication of whether anyone else agreed with me
-(maybe the lack of loud complaints should be taken as consent?)
-
- regards, tom lane
-