By: Steve

Steve — Tue, 03 Mar 2009 20:05:22 +0000

Thank you!

By: maclochlainn

maclochlainn — Thu, 25 Dec 2008 05:50:10 +0000

I’ve added a bunch of content to address the question in the modified post. I hope it helps you.

The quickest way is to query like this to find rows that contain a null value for a nested table:

SELECT   rowid
FROM     some_table
WHERE    some_collection_column IS NULL;

Also, an not-null but empty collection can be found by using this syntax:

SELECT   rowid
FROM     some_table
WHERE    some_collection_column IS EMPTY;

A populated collection column is found by checking for the absence of the first two conditions, like:

SELECT   rowid
FROM     some_table
WHERE    some_collection_column IS NOT EMPTY
AND      some_collection_column IS NOT NULL;

swapnil — Wed, 24 Dec 2008 05:33:19 +0000

How can we check for nested column whether it is null or not as we cannot use NVL on nested column