xml - Xquery: Find the Makers such that every PC they produce has a price no more than 100 -


i'm trying path conditions "find makers such every pc produce has price no more 100" , "find names of makers produces @ least 2 pc’s speed of 3 or more". i'm using data pasted below.

i'm little lost , love example on how carry out.

with data: 

  <?xml version="1.0" encoding="utf-8"?> <products>   <maker name="a">     <pc model="1001" price="2114">        <speed>2.66</speed>         <ram>1024</ram>       <harddisk>250</harddisk>     </pc>     <pc model="1002" price="995">       <speed>2.10</speed>       <ram>512</ram>       <harddisk>250</harddisk>     </pc>     <laptop model="2004" price="1150">       <speed>2.00</speed>       <ram>512</ram>       <harddisk>60</harddisk>         <screen>13.3</screen>     </laptop>     <laptop model="2005" price="2500">       <speed>2.16</speed>       <ram>1024</ram>       <harddisk>120</harddisk>       <screen>17.0</screen>     </laptop>    </maker>   <maker name="e">     <pc model="1011" price="959">       <speed>l.86</speed>         <ram>2048</ram>         <harddisk>160</harddisk>     </pc>     <pc model="1012" price="649">       <speed>2.80</speed>       <ram>1024</ram>       <harddisk>160</harddisk>     </pc>     <laptop model="2001" price="3673">       <speed>2.00</speed>       <ram>2048</ram>       <harddisk>240</harddisk>       <screen>20.1</screen>     </laptop>     <printer model="3002" price="239">       <color>false</color>       <type>laser</type>     </printer>   </maker>   <maker name="h">     <printer model="3006" price="100">       <color>true</color>       <type>ink-jet</type>      </printer>     <printer model="3007" price="200">       <color>true</color>       <type>laser</type>     </printer>   </maker> </products>

find makers such every pc produce has price no more [1000]

i changed 100 1000 since there isn't maker makes pc price under 100 in sample data.

another way read question is:

find maker's (/products/maker), that make pc ([pc]), that have no pc's price greater 1000 ([not(pc/@price > 1000)]).

all put together...

/products/maker[pc , not(pc/@price > 1000)]

equivalent flwr statement...

for $maker in /products/maker $maker/pc , not($maker/pc/@price > 1000) return     $maker

result (both xpath , flwr)...

<maker name="e">     <pc model="1011" price="959">         <speed>l.86</speed>           <ram>2048</ram>           <harddisk>160</harddisk>     </pc>     <pc model="1012" price="649">         <speed>2.80</speed>         <ram>1024</ram>         <harddisk>160</harddisk>     </pc>     <laptop model="2001" price="3673">         <speed>2.00</speed>         <ram>2048</ram>         <harddisk>240</harddisk>         <screen>20.1</screen>     </laptop>     <printer model="3002" price="239">         <color>false</color>         <type>laser</type>     </printer> </maker>

find names of makers produces @ least 2 pc’s speed of [2] or more

i changed 3 2 since there isn't maker makes 2 or more pc's speed of 3 or more in sample data.

another way read question is:

find names of makers (/products/maker/@name) that produce @ least 2 pc's ([count(pc) >= 2]) with speed of 2 or more ([speed >= 2]).

all put together...

/products/maker[count(pc[speed >= 2]) >= 2]/data(@name)

equivalent flwr statement...

for $maker in /products/maker count($maker/pc[speed >= 2]) >= 2 return     data($maker/@name)

result (both xpath , flwr)...

a

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