How to omit elements/attributes if the value of the element is zero?

Hi gurus

It's me again. with a quick question...
I'm sure everyone knows the difference between these two statements (running in the SCOTT schema):

Select
XmlElement ('employees',
XMLAGG)
XMLFOREST (comm as "SalesCommEmployee")
)
)
EMP;

Select
XmlElement ('employees',
XMLAGG)
XmlElement ("SalesCommEmployee", comm)
)
)
EMP;

First statement out fewer records because XMLFOREST shows nothing if the value of the element is null.
But what happens if element has attributes?. Say:

Select
XmlElement ('employees',
XMLAGG)
XmlElement ("SalesCommEmployee", xmlattributes (empno as "id"), comm)
)
)
EMP;

Is it possible to omit any element (including attributes) if the value of the element is set to zero.
Of course, it is a simplistic example, in this case, a WHERE clause would solve the problem.
In my particular case, I am managing a huge SELECT with multiple levels of xml and some elements (with attributes), may have null values, and must be included in this case nothing.

I am considering a dirty search/delete option on the output, but I think that a more elegant solution must exist.

Can you give me some advice?

Thank you
Oscar

Hello

You can use a CASE statement, DECODE or NVL2 functions.

Here is an example with NVL2 (returns 2nd argument if the 1st is not not null, otherwise the 3rd):

SQL> select xmlserialize(document
  2           xmlelement("Employees",
  3             xmlagg(
  4               nvl2( comm
  5                   , xmlelement("SalesCommEmployee", xmlattributes(empno as "id"), comm)
  6                   , null )
  7             )
  8           )
  9           as clob indent
 10         ) as result
 11  from scott.emp
 12  ;

RESULT
--------------------------------------------------------------------------------

  300
  500
  1400
  0

Tags: Database

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