In 9i XMLAGG use to merge lines

Hello

I have some standard SQL that returns:
Smith Parameter1 Value1
Smith Parameter2 Value2
Smith Parameter3 Value3
Jones Parameter1 Value1
Jones Parameter2 Value2
I want the output to be displayed in the form:
Smith Parameter1 Value1 Parameter2 Value2 Parameter3 Value3
Jones Parameter1 Value1 Parameter2 Value2
I've found that XMLAGG and XMLELEMENT functions make the case:
SELECT e.EMPLOYEE, RTRIM(XMLAGG(XMLELEMENT(my_element, p.P_NAME||' '||v.P_VALUE||' ')).extract('//text()'), ' ')
FROM my_employees e, my_parameters p, my_parameter_values v
WHERE v.P_ID = p.P_ID
AND v.EMP_ID = e.EMP_ID
GROUP BY e.EMPLOYEE
The only thing is, the SQL command order initially lines does not appear when they are merged in a single line, so I can get:
Smith Parameter1 Value1 Parameter3 Value3 Parameter2 Value2
Jones Parameter2 Value2 Parameter1 Value1
He returned in the correct order if I run the SQL without the XMLELEMENTS/XMLAGG function, so I guess it's a question of how the XMLAGG function parses the data?

Is that what I can do to fix this problem or is there another approach (in 9i) that I can use to get the required result?

Thank you very much

Bagpuss

Published by: Bagpuss on July 22, 2010 03:36

Published by: Bagpuss on July 22, 2010 03:39

Bagpuss says:
Is that what I can do to fix this problem or is there another approach (in 9i) that I can use to get the required result?

The ORDER BY for XMLAGG clause gives you good results?

SELECT e.EMPLOYEE, RTRIM(XMLAGG(XMLELEMENT(my_element, p.P_NAME||' '||v.P_VALUE||' ') ORDER BY p.P_NAME).extract('//text()'), ' ')
FROM my_employees e, my_parameters p, my_parameter_values v
WHERE v.P_ID = p.P_ID
AND v.EMP_ID = e.EMP_ID
GROUP BY e.EMPLOYEE

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