How to formulate SQL that need to use some XML data in a clob?

Hi,
We just created a new 8i table that has some regular fields as well as a clob field that contains XML data. How could I bring back the value of a spcific element in the XML field and compare it against a regular field? For example, I want to make sure the value in field A is not the same as the value of a specific element in field b. Your help is very much appreciated.
select * from X
where X.a <> X.b.elementZ

Depending on how complex your XML data is, you can write a simple function that does a string search of the CLOB and returns the value of the tag you are looking at. Then you can compare the value of the tag and the value of the the column.
select * from X
where x.a <> getTagValue(X.b,'elementZ')
Check out the DBMS_LOB package.

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Please mark this reply as the answer or vote as helpful, as appropriate, to make it useful for other readers

How to formulate SQL that need to use some XML data in a clob?

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