James Bond <coolof...@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°
--
Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-sql
