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Re: Complicated Querry

From: "Bhavin" <v2desperado@-----.--->
To: NULL
Date: 4/2/2007 10:16:00 AM

On Apr 1, 11:11 pm, "Dimitre Novatchev" <dimit...@tpg.com.au> wrote:
> "Bhavin" <v2desper...@gmail.com> wrote in message
>
> news:1175477394.982261.297980@e......
>
>
>
> >I had querry that " Display the Games 'India' won."
>
> > XML File:
>
> > <?xml version="1.0"?>
> > <playoffs>
> >    <team id="ID0">
> >        <name>India</name>
> >    </team>
> >    <team id="ID1">
> >        <name>Brazil</name>
> >    </team>
> > <team id="ID2">
> >        <name>ManU</name>
> >    </team>
> >     <team id="ID3">
> >        <name>France</name>
> >    </team>
>
> >    <player id="101" team-id="ID0" dob="1985-01-01" role="GoalKeeper">
> >        <name>John Smith</name>
> >    </player>
> >    <player id="102" team-id="ID0" dob="1984-02-02" role="Attack">
> >        <name>Sachin Tendulkar</name>
> >    </player>
> >    <player id="103" team-id="ID0" dob="1983-03-03" role="Defense">
> >        <name>Bryan</name>
> >    </player>
>
> > <player id="201" team-id="ID1" dob="1985-04-04" role="GoalKeeper">
> >    <name>Imran Khan</name>
> >    </player>
> >    <player id="202" team-id="ID1" dob="1985-05-05" role="Attack">
> >        <name>David</name>
> >    </player>
> >    <player id="203" team-id="ID1" dob="1984-12-12" role="Defense">
> >        <name>Ronaldo</name>
> >    </player>
>
> >    <player id="a1" team-id="ID2" dob="1983-01-01" role="GoalKeeper">
> >        <name>Rivaldo</name>
> >    </player>
> >    <player id="a2" team-id="ID2" dob="1982-01-01" role="Attack">
> >        <name>Ronaldinho</name>
> >    </player>
> >    <player id="a3" team-id="ID2" dob="1985-01-01" role="Attack">
> >        <name>Cafu</name>
> >    </player>
>
> > <player id="b1" team-id="ID3" dob="1980-07-07" role="GoalKeeper">
> >    <name>Beckham</name>
> >    </player>
> >    <player id="b2" team-id="ID3" dob="1981-08-08" role="Attack">
> >        <name>Carlos</name>
> >    </player>
> >    <player id="b3" team-id="ID3" dob="1983-09-0" role="Attack">
> >        <name>Starwarko</name>
> >    </player>
>
> >    <game team1-id="ID0" team2-id="ID1">
> >        <goal player-id="101"/>
> >        <goal player-id="101"/>
> >        <goal player-id="201"/>
> >        <card player-id="101" color="yellow"/>
> > <card player-id="101" color="yellow"/>
> >   </game>
> >       <game team1-id="ID0" team2-id="ID1">
> >        <goal player-id="101"/>
> >        <goal player-id="202"/>
> >        <goal player-id="201"/>
> >        <card player-id="101" color="yellow"/>
> > <card player-id="101" color="yellow"/>
> > </game>
> >       <game team1-id="ID2" team2-id="ID3">
> >        <goal player-id="a1"/>
> >        <goal player-id="a2"/>
> >        <goal player-id="b1"/>
> >        <card player-id="b2" color="yellow"/>
> > <card player-id="a3" color="yellow"/>
> >   </game>
> > </playoffs>
>
> > What i did is first find the
>
> > 1] DISPLAY ALL THE GAMES WHICH India PLAYED
>
> > /playoffs/game[@team1-id | @team2-id =/playoffs/team[name="India"]/
> > @id]
>
> > 2] DISPLAY ALL THE PLAYER OF THE TEAM india WITH PLAYER ID
>
> > /playoffs/player[@team-id =/playoffs/team[name="India"]/@id]/@id
>
> > 3] DISPLAY ALL THE GOALS made in the matches in which india played
>
> > //game[@team1-id | @team2-id =//team[name="India"]/@id]//goal/@player-
> > id
>
> > 4] combine 2 result to find goal made by India.
>
> > /playoffs/game[@team1-id | @team2-id =/playoffs/team[name="Legia"]/
> > @id]/goal[@player-id =
> > /playoffs/player[@team-id =/playoffs/team[name="Legia"]/@id]/@id]
>
> > I dont know how to proced ahead to compare.....etc
> > if u can help ....... that would be appreciated
>
> Using the XPath Visualizer one can quickly arrive at the following:
>
>       variable                              Expression
> =================================================================
> $vGameswithIndia                    /*/game[/*/team[name='India']/@id = @*]
>
> $vIndianPlayers                        /*/player[@team-id = /*/team[name =
> 'India']/@id]
>
> $vIndianPlayerIds                     /*/player[@team-id = /*/team[name =
> 'India']/@id]/@id
>
> Then, the following XPath 1.0 expression selects all games in which India
> won (scored more goals than the opposite team):
>
> $vGameswithIndia[count(goal[@player-id = $vIndianPlayerIds]) >
> count(goal[not(@player-id=$vIndianPlayerIds)])]
>
> The XPath Visualizer highlights the one game selected by this XPath
> expression:
>
>  <game team1-id="ID0" team2-id="ID1">
>   <goal player-id="101"/>
>   <goal player-id="101"/>
>   <goal player-id="201"/>
>   <card player-id="101" color="yellow"/>
>   <card player-id="101" color="yellow"/>
>  </game>
>
> We can easily replace the variable references in the above XPath expression
> and thus get the following XPath expression, which produces the wanted
> result:
>
> /*/game
>     [/*/team[name='India']/@id
>    =
>     @*]
>     [count(goal[@player-id = /*/player[@team-id = /*/team[name =
> 'India']/@id]/@id])
>    >
>     count(goal[not(@player-id=/*/player[@team-id = /*/team[name =
> 'India']/@id]/@id)])
>     ]
>
> We can even read and understand this XPath expression quite well:
>
> Select all games in which one of the teams was India
>
> (and) such that
>       the count of goals scored by a player of the team of India
>
>   was greater than
>
>       the count of goals scored by players not from the team of India.
>
> Hope this helped.
>
> Cheers,
> Dimitre Novatchev

Thank you for helping me out, i spent almost 1 day in solving that
Query. I really appreciate your work



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