On Wed, 2002-08-14 at 12:45, Sean Chittenden wrote:
> > > > > Well, they aren't separate fields so you can't ORDER BY domain. The dot
> > > > > was used so it looks like a schema based on dbname.
> >
> > IMHO it should look like an user in domain ;)
>
> Agreed, but there is something to be said for doing a sort of users
> per domain. This wouldn't be an issue, I don't think, if there was a
> split_before() and split_after() like functions.
>
> # SELECT split_before('user@domain.com','@'), split_after('user@domain.com', '@');
> ?column? | ?column?
> ----------+------------
> user | domain.com
>
> What would you guys say to submissions for a patch that would add the
> function listed above?
create function split_before(text,text) returns text as 'select case when (strpos($1,$2) > 0) then
substr($1,1,strpos($1,$2)-1) else $1 end as usename
' language 'SQL';
create function split_after(text,text) returns text as 'select case when (strpos($1,$2) > 0) then
substr($1,strpos($1,$2)+1) else '''' end as usedomain
' language 'SQL' ;
hannu=# select split_before('me@somewhere','@'),
split_after('me@somewhere','@');split_before | split_after
--------------+-------------me | somewhere
(1 row)
-------------
Hannu
