Best way to extract this info?

Question

Hello:
I have information stored in xmltype as follows:
<INFO>
<ASG>
<LMT id="A1">
<LMT_VAL>7</LMT_VAL>
</LMT>
<LMT id="B1">
<LMT_VAL>6</LMT_VAL>
</LMT>
</ASG>
</INFO>
The above info may be dynamic. Example, for some types, There may be additional LMT element with a value of C1 and D1. So what is the best way to extract all of them (A1, B1, C1, D1) - even though in some cases only A1 and B1 may be present?
Do I have to extract like:
select ...
where
t1.xml.col.extract('/INFO/ASG/LMT/LMT_VAL/@id').getStringVal() = 'A1'
Do I have a condition like this where ... = A1
Any help appreciated.

Answer 1

Hi,
one left round bracket is missing
TABLE(xmlsequence(extract (<b> (</b><---missing SELECT xml_column FROM your_table)....If you have more then one row in the table it's not working!
SQL> CREATE TABLE test_xml(
  2   id NUMBER
  3  ,xml_col XMLType)
  4  /
Table created.
SQL> INSERT INTO test_xml VALUES(1,xmltype('<INFO>
  2  <ASG>
  3  <LMT id="A1">
  4  <LMT_VAL>7</LMT_VAL>
  5  </LMT>
  6  <LMT id="B1">
  7  <LMT_VAL>6</LMT_VAL>
  8  </LMT>
  9  </ASG>
10  </INFO>'))
11  /
1 row created.
SQL> INSERT INTO test_xml VALUES(2,xmltype('<INFO>
  2  <ASG>
  3  <LMT id="A1">
  4  <LMT_VAL>7</LMT_VAL>
  5  </LMT>
  6  <LMT id="B1">
  7  <LMT_VAL>6</LMT_VAL>
  8  </LMT>
  9  </ASG>
10  </INFO>'))
11  /
1 row created.
SQL> SELECT extractvalue(column_value, '/LMT/@id') new_id,
  2         extractvalue(column_value,'/LMT/LMT_VAL') new_value
  3  FROM TABLE(xmlsequence(extract ((SELECT xml_col FROM test_xml), '/INFO/ASG/LMT')));
FROM TABLE(xmlsequence(extract ((SELECT xml_col FROM test_xml), '/INFO/ASG/LMT')))
ERROR at line 3:
ORA-01427: single-row subquery returns more than one row
SQL> spool off;