Re: [GENERAL] question about age()
Tom Lane wrote: > Andreas Kretschmer writes: > > '3 years' != '2 years 11 mons 30 days', but i got 0 rows, why? > > Well, actually: > > regression=# select '3 years'::interval = '2 years 11 mons 30 days'::interval; > ?column? > -- > t > (1 row) > > IIRC, interval comparison operators normalize the two values assuming that > 1 month = 30 days. Which is kind of arbitrary, but without some such > assumption there's no way to have a scalar ordering of intervals at all. Thanks, okay, make sense. I'm using extract() to extract and compare the YEAR-field to spot a birthday from the age() ;-) Andreas -- Really, I'm not out to destroy Microsoft. That will just be a completely unintentional side effect. (Linus Torvalds) "If I was god, I would recompile penguin with --enable-fly." (unknown) Kaufbach, Saxony, Germany, Europe. N 51.05082°, E 13.56889° -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
Re: [GENERAL] question about age()
Andreas Kretschmer writes: > '3 years' != '2 years 11 mons 30 days', but i got 0 rows, why? Well, actually: regression=# select '3 years'::interval = '2 years 11 mons 30 days'::interval; ?column? -- t (1 row) IIRC, interval comparison operators normalize the two values assuming that 1 month = 30 days. Which is kind of arbitrary, but without some such assumption there's no way to have a scalar ordering of intervals at all. regards, tom lane -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
Re: [GENERAL] question about age()
On 8/29/13, Michael Nolan wrote: > On 8/29/13, Andreas Kretschmer wrote: > >> I'm using 9.2.4. > > > What is the content of the field 'birthday''? My guess is there's a > null value for the field, in which case you are comparing two nulls. Oops, missed seeing the first half of the post with the data. It may be a function output type issue. Modifying the query as follows works (in 8.2, which I'm still stuck on): select * from birthday where age(birthday)::text != age (current_date-1, birthday)::text; -- Mike Nolan -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
Re: [GENERAL] question about age()
On 8/29/13, Andreas Kretschmer wrote: > is there a bug in age()? > > test=*# select *, age(birthday), age (current_date-1, birthday) from > birthday ; > id | birthday | age | age > ++-+- > 1 | 2010-08-29 | 3 years | 2 years 11 mons 30 days > (1 row) > > Time: 0,322 ms > test=*# select * from birthday where age(birthday) != age (current_date-1, > birthday); > id | birthday > +-- > (0 rows) > > '3 years' != '2 years 11 mons 30 days', but i got 0 rows, why? > > > I'm using 9.2.4. What is the content of the field 'birthday''? My guess is there's a null value for the field, in which case you are comparing two nulls. -- Mike Nolan -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
Re: [GENERAL] question about age()
On 08/29/2013 01:11 PM, Andreas Kretschmer wrote:
is there a bug in age()?
test=*# select *, age(birthday), age (current_date-1, birthday) from birthday ;
id | birthday | age | age
++-+-
1 | 2010-08-29 | 3 years | 2 years 11 mons 30 days
(1 row)
Time: 0,322 ms
test=*# select * from birthday where age(birthday) != age (current_date-1,
birthday);
id | birthday
+--
(0 rows)
'3 years' != '2 years 11 mons 30 days', but i got 0 rows, why?
I'm using 9.2.4.
Andreas
Seems correct to me.
select current_date, current_date -1 as yesterday,
age('2010-08-28'::date), age(current_date -1, '2010-08-28'::date);
+++---+-+
|date| yesterday | age | age |
+++---+-+
| 2013-08-29 | 2013-08-28 | 3 years 1 day | 3 years |
+++---+-+
(1 row)
select version();
+---+
| version|
+---+
| PostgreSQL 9.3beta2 on x86_64-unknown-linux-gnu, compiled by gcc
(Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3, 64-bit |
+---+
(1 row)
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Re: [GENERAL] question about age()
On Thu, Aug 29, 2013 at 09:11:07PM +0200, Andreas Kretschmer wrote: > test=*# select * from birthday where age(birthday) != age (current_date-1, > birthday); > id | birthday > +-- > (0 rows) > > '3 years' != '2 years 11 mons 30 days', but i got 0 rows, why? What does select age(birthday) = age (current_date-1, birthday) from birthday; say ? -- GPG key ID E4071346 @ gpg-keyserver.de E167 67FD A291 2BEA 73BD 4537 78B9 A9F9 E407 1346 -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
[GENERAL] question about age()
is there a bug in age()? test=*# select *, age(birthday), age (current_date-1, birthday) from birthday ; id | birthday | age | age ++-+- 1 | 2010-08-29 | 3 years | 2 years 11 mons 30 days (1 row) Time: 0,322 ms test=*# select * from birthday where age(birthday) != age (current_date-1, birthday); id | birthday +-- (0 rows) '3 years' != '2 years 11 mons 30 days', but i got 0 rows, why? I'm using 9.2.4. Andreas -- Really, I'm not out to destroy Microsoft. That will just be a completely unintentional side effect. (Linus Torvalds) "If I was god, I would recompile penguin with --enable-fly." (unknown) Kaufbach, Saxony, Germany, Europe. N 51.05082°, E 13.56889° -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
