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* postgres sql help
@ 2011-10-14 15:41 James Bond <coolofall@hotmail.com>
2011-10-16 08:11 ` Re: postgres sql help Andreas Kretschmer <akretschmer@spamfence.net>
2011-10-16 08:24 ` Re: postgres sql help Harald Fuchs <hari.fuchs@gmail.com>
0 siblings, 2 replies; 4+ messages in thread
From: James Bond @ 2011-10-14 15:41 UTC (permalink / raw)
To: pgsql-sql
hi, i am fairly new in postgresql, so if anyone can help me would be great
if i simply do:
select ver_no
from version
order by ver_no
the result will be something like this:
.1.3.1
.1.3.2.5.
.1.4.1.7.12
.1.4.11.14.7.
.1.4.3.109.1.
.1.4.8.66.
so as you can see first 3 lines are ok, but how to make 1.4.3.109 come
before 1.4.11 because the third level "3" is smaller than "11". i
understand they are stored as char so i used split_part function to
separate each numbers between "." in a separate column. but when i try
to convert those column into integer, i am getting an error msg saying:
ERROR: invalid input syntax for type numeric: " "
here is my code:
select ver_no, duedate, status,
to_number(split_part(ver_no, '.', 2), '9999') a,
to_number(split_part(ver_no, '.', 3), '9999') b,
to_number(split_part(ver_no, '.', 4), '9999') c,
to_number(split_part(ver_no, '.', 5), '9999') d
from version
order by a,b,c,d
I am not sure if i am heading towards wrong direction but can someone please suggest or give me some other ideas to sort this.
PS: i found some good solution in SQL Server but those commands are not used in postgreSQL.
Thanks in advance
- James
=
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: postgres sql help
2011-10-14 15:41 postgres sql help James Bond <coolofall@hotmail.com>
@ 2011-10-16 08:11 ` Andreas Kretschmer <akretschmer@spamfence.net>
1 sibling, 0 replies; 4+ messages in thread
From: Andreas Kretschmer @ 2011-10-16 08:11 UTC (permalink / raw)
To: pgsql-sql
James Bond <coolofall@hotmail.com> wrote:
> hi, i am fairly new in postgresql, so if anyone can help me would be great
>
> if i simply do:
>
> select ver_no
> from version
> order by ver_no
>
> the result will be something like this:
>
> .1.3.1
> .1.3.2.5.
> .1.4.1.7.12
> .1.4.11.14.7.
> .1.4.3.109.1.
> .1.4.8.66.
>
> so as you can see first 3 lines are ok, but how to make 1.4.3.109 come before
> 1.4.11 because the third level "3" is smaller than "11". i understand they are
> stored as char so i used split_part function to separate each numbers between
> "." in a separate column. but when i try to convert those column into integer,
> i am getting an error msg saying: ERROR: invalid input syntax for type numeric:
> " "
>
> here is my code:
test=*# select * from o;
t
---------------
.1.3.1
.1.3.2.5.
.1.4.1.7.12
.1.4.11.14.7.
.1.4.3.109.1.
.1.4.8.66.
(6 rows)
Time: 0,262 ms
test=*# select * from o order by split_part(t,'.',2)::int,
split_part(t,'.',3)::int, split_part(t,'.',4)::int;
t
---------------
.1.3.1
.1.3.2.5.
.1.4.1.7.12
.1.4.3.109.1.
.1.4.8.66.
.1.4.11.14.7.
(6 rows)
Time: 0,403 ms
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°
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: postgres sql help
2011-10-14 15:41 postgres sql help James Bond <coolofall@hotmail.com>
@ 2011-10-16 08:24 ` Harald Fuchs <hari.fuchs@gmail.com>
2011-10-17 20:44 ` Re: postgres sql help Tim Landscheidt <tim@tim-landscheidt.de>
1 sibling, 1 reply; 4+ messages in thread
From: Harald Fuchs @ 2011-10-16 08:24 UTC (permalink / raw)
To: pgsql-sql
In article <SNT102-W49402A41C6B6599F082D35A8E10@phx.gbl>,
James Bond <coolofall@hotmail.com> writes:
> hi, i am fairly new in postgresql, so if anyone can help me would be great
> if i simply do:
> select ver_no
> from version
> order by ver_no
> the result will be something like this:
> .1.3.1
> .1.3.2.5.
> .1.4.1.7.12
> .1.4.11.14.7.
> .1.4.3.109.1.
> .1.4.8.66.
> so as you can see first 3 lines are ok, but how to make 1.4.3.109 come
> before 1.4.11 because the third level "3" is smaller than "11".
The query
SELECT ver_no
FROM version
ORDER BY string_to_array(ver_no, '.', '')::int[]
should do what you want.
^ permalink raw reply [nested|flat] 4+ messages in thread
* Re: postgres sql help
2011-10-14 15:41 postgres sql help James Bond <coolofall@hotmail.com>
2011-10-16 08:24 ` Re: postgres sql help Harald Fuchs <hari.fuchs@gmail.com>
@ 2011-10-17 20:44 ` Tim Landscheidt <tim@tim-landscheidt.de>
0 siblings, 0 replies; 4+ messages in thread
From: Tim Landscheidt @ 2011-10-17 20:44 UTC (permalink / raw)
To: pgsql-sql
Harald Fuchs <hari.fuchs@gmail.com> wrote:
>> hi, i am fairly new in postgresql, so if anyone can help me would be great
>> if i simply do:
>> select ver_no
>> from version
>> order by ver_no
>> the result will be something like this:
>> .1.3.1
>> .1.3.2.5.
>> .1.4.1.7.12
>> .1.4.11.14.7.
>> .1.4.3.109.1.
>> .1.4.8.66.
>> so as you can see first 3 lines are ok, but how to make 1.4.3.109 come
>> before 1.4.11 because the third level "3" is smaller than "11".
> The query
> SELECT ver_no
> FROM version
> ORDER BY string_to_array(ver_no, '.', '')::int[]
> should do what you want.
Really neat! :-) For pre-9.1, you have to "ORDER BY
string_to_array(TRIM('.' FROM ver_no), '.')::int[];",
though.
Tim
^ permalink raw reply [nested|flat] 4+ messages in thread
end of thread, other threads:[~2011-10-17 20:44 UTC | newest]
Thread overview: 4+ messages (download: mbox mbox.gz follow: Atom feed)
-- links below jump to the message on this page --
2011-10-14 15:41 postgres sql help James Bond <coolofall@hotmail.com>
2011-10-16 08:11 ` Andreas Kretschmer <akretschmer@spamfence.net>
2011-10-16 08:24 ` Harald Fuchs <hari.fuchs@gmail.com>
2011-10-17 20:44 ` Tim Landscheidt <tim@tim-landscheidt.de>
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