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Null value in hierarchical query for APEX tree view in APEX 5.1

Madona328-OracleAug 14 2018 — edited Aug 15 2018

I need to develop a tree view  for a table ,the connection being provided by two columns 'sample' and 'sample_source'.

I use a hierarchical sql query for that .

The sample code is given below:

select case when connect_by_isleaf = 1 then 0 when level = 1 then 1 else -1 end as status,


        sample as title,

        'icon-tree-folder' as icon,

        sample as value,

        sample as tooltip,

        null  as link

   from (select sample,sample_source from table_name  group by (sample,sample_source))

  start with sample is null

connect by prior sample=sample_source

  order siblings by sample

Here my problem is that. In the first level, both sample and sample_source are null. In the next level,sample is not null, sample_source will be null . Remaining all levels sample and sample_source are not null.

So using the above query I am not able to make the connection from first to second level (may be because of null values) so that the tree wont be displayed..

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Locked due to inactivity on Sep 12 2018
Added on Aug 14 2018
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