Extract specific xml node from duplicate ones in oracle - sql

Question

Given is the value of "my_xml" column in "XYZ" table
<?xml version="1.0" encoding="UTF-8"?>
<India>
<city>
<string>ADI</string>
<string>Ahmedabad</string>
</city>
<city>
<string>GNR</string>
<string>Gandhinagar</string>
</city>
<city>
<string>PUN</string>
<string>Pune</string>
</city>
<city>
<string>RJT</string>
<string>Rajkot</string>
</city>
</India>
I am trying to extract value of second string node where first string node value is ADI
Output should be "Ahmedabad" only
Failed attempts:
select t.my_xml.extract('/India/city/string[2]/text()').getStringVal() from XYZ t where t.my_xml.existsNode('/India/city[string[1] = "ADI"]') = 1;
Output for above query is AhmedabadGandhinagarPuneRajkot
Expected output: Ahmedabad
How to extract specific node value for string node here?

Answer 1

You want to select the node that has the ADI text as first string.
Try this:
select
t.my_xml.extract('//city[./string[1]/text() = "ADI"]/string[2]/text()').getStringVal()
from XYZ t
where t.my_xml.existsNode('/India/city[string[1] = "ADI"]') = 1;

Answer 2

Use XMLTable to extract the values:
SELECT t.*
FROM XYZ x,
XMLTable(
'/India/city'
PASSING x.my_xml
COLUMNS string1 CHAR(3) PATH './string[1]',
string2 VARCHAR2(20) PATH './string[2]'
) t
WHERE t.string1 = 'ADI';

Answer 3

1) With xmlquery and flwor xquery
select xmlcast( xmlquery('for $i in ./India/city where $i//string[1]/text() = $cond return $i/string[2]/text()' passing xmltype(q'~<India>
<city>
<string>ADI</string>
<string>Ahmedabad</string>
</city>
<city>
<string>GNR</string>
<string>Gandhinagar</string>
</city>
<city>
<string>PUN</string>
<string>Pune</string>
</city>
<city>
<string>RJT</string>
<string>Rajkot</string>
</city>
</India>~'), 'ADI' as "cond" returning content) as varchar2(20)) result from dual;
2) If you're expecting more than one row try xmltable.
select * from xmltable('$doc/India/city' passing xmltype(q'~<India>
<city>
<string>ADI</string>
<string>Ahmedabad</string>
</city>
<city>
<string>GNR</string>
<string>Gandhinagar</string>
</city>
<city>
<string>PUN</string>
<string>Pune</string>
</city>
<city>
<string>ADI</string>
<string>Ahmedabad</string>
</city>
<city>
<string>RJT</string>
<string>Rajkot</string>
</city>
</India>~') as "doc"
columns
string1 varchar2(20) path'./string[1]/text()'
, string2 varchar2(20) path'./string[2]/text()'
)
where string1='ADI'
and xmltable with flwor xquery
select column_value from xmltable('for $el in $doc/India/city where $el//string[1]/text() = "ADI" return $el/string[2]/text()' passing xmltype(q'~<India>
<city>
<string>ADI</string>
<string>Ahmedabad</string>
</city>
<city>
<string>GNR</string>
<string>Gandhinagar</string>
</city>
<city>
<string>PUN</string>
<string>Pune</string>
</city>
<city>
<string>ADI</string>
<string>Ahmedabad</string>
</city>
<city>
<string>RJT</string>
<string>Rajkot</string>
</city>
</India>~') as "doc" )
;