Re: postgres sql help

James Bond <coolofall(at)hotmail(dot)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
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