Thread: XML output & multiple SELECT queries

Dear PostgreSQL users,

I would like to ask a question about outputting data as XML. Say I have two
tables:

team(integer id, text name);
player_of_team(integer id, integer team_id, text name); (team_id is FK to
team.id)

I would like to query both tables to get following example XML output:

<team name="Real Madrid">
     <players>
         <name>Garcia</name>
         <name>Robinho</name>
     </players>
</team>

Is this possible in one query? I'm thinking about something like this, but I
haven't figured it out so far:

SELECT XMLElement(name team, XMLAttributes(name as name), SELECT XMLElement(name
players, XMLForest(name)) FROM player_of_team WHERE team_id = t.id) FROM team t
WHERE t.name = 'Real Madrid';

In other words, is it possible to nest multiple SELECT queries in the XML output
functions?

Thanks in advance. Kind regards,

Peter

Peter Billen wrote:
> I would like to ask a question about outputting data as XML. Say I have two
> tables:
>
> team(integer id, text name);
> player_of_team(integer id, integer team_id, text name); (team_id is FK to
> team.id)
>
> I would like to query both tables to get following example XML output:
>
> <team name="Real Madrid">
>      <players>
>          <name>Garcia</name>
>          <name>Robinho</name>
>      </players>
> </team>

SELECT XMLElement(name team, XMLAttributes(team.name as name), XMLElement(name
players, XMLAgg(XMLElement(name name, player_of_team.name)))) FROM team JOIN
player_of_team ON team.id = player_of_team.team_id GROUP BY team.name;