Search the xml node by attributes and display the entire row

Question

I am having a table with two columns say
school_name string type
student_notebookprice xmldata
how do i search with oracle query having student_id=102 and schoolname="abc_school" with notebook price 20, how do i get only one single row
abc_school,
<students>
     <student id="101">
     <notebookprice>12</notebookprice>
     </student>
     <student id="102">
          <notebookprice>20</notebookprice>
          <notebookprice>30</notebookprice>
          <notebookprice>40</notebookprice>
</student>
</students>
def_school,
<students>
     <student id="301">
     <notebookprice>10</notebookprice>
     </student>
     <student id="302">
          <notebookprice>15</notebookprice>
          <notebookprice>16</notebookprice>
</student>
</students>

Answer 1

yes . what i want based on search criteria i need to display that row . initially i have tried with the below query
SELECT school_name,
extractvalue(value(x), '//id') as student_id ,
extractValue(value(x), '//teacher') AS teacher
FROM school t ,
TABLE( XMLSequence( Extract(t.obj_xml, '/students/student[id=101 and teacher="abc"]'))) x
where existsNode(t.obj_xml, '/students/student[id=101 and teacher="abc"]') = 1
but when i want to add the second student in the search , i am failed to produce the second student information in the output and i can able to add it to where clause and but how to display the student info in the output . The xmltable option that u have specified looks good but what i fear is , it produce multiple combination with all the tags in the xml with the other columns in the table . will it cause any performence issue .
<students>
<student >
<id>101</id>
<teacher>abc</teacher>
</student>
<student >
<id>102</id>
<teacher>xyz</teacher>
<teacher>onp</teacher>
<teacher>rsm</teacher>
</student>
</students>
SELECT school_name,
extractvalue(value(x), '//id') as student_id ,
extractValue(value(x), '//teacher') AS teacher
FROM school t ,
TABLE( XMLSequence( Extract(t.obj_xml, '/students/student[id=101 and teacher="abc"]'))) x
where existsNode(t.obj_xml, '/students/student[id=101 and teacher="abc"]') = 1
and existsnode(t.obj_xml, '/students/student[id=102 and teacher="xyz"]') = 1