Mixing traditional and recursive queries

Question

Hello,
I'm trying to solve this problem on a single SQL statement but I haven't been able to do it. Let me explain.
I've a plain table where I'm doing a single select without problems.
There is another recursive table that is used to retrieve the hierarchical structure for a selected key item that is used as a START WITH clause.
The problem appears when, for each record selected on first query, I would like to retrieve the leaf records for it's structure.
I assume that if I can use the key value obtained from the first query as a START WITH clause on the recursive on I'll get the required information.
But I don't know how to do it.
Are there anyone that can help me?
Thanks.

Answer 1

Hi,
Thanks for posting the sample data; that's exatly what poeple need to help you.
user12132557 wrote:
If I launch SELECT ID,DESCRIP FROM ITEMS WHERE YEAR >= 2005
I'll get last 3 records.
For each one I would launch a select like
SELECT ITEM,DESCRIP FROM TREE
START WITH ITEM=+column_id_last_query+
CONNECT BY PRIOR ITEM = PARENTIt's fine to describe the results you want, but there's no substitute for actually posting the results you want.
Is this what you're trying to produce, given the data you posted and the input parameter 2005?
`   PARENT       ITEM DESCRIP
         5         50 Item 50
        51         53 Item 53
        51         54 Item 54
        51         55 Item 55Whenever you post formatted text (such as query results) on this site, type these 6 characters:
\(small letters only, inside curly brackets) before and after each section of formatted text, to preserve spacing.
One way to get the results above in Oracle 9 is:SELECT     *
FROM     tree
WHERE     item     NOT IN     (
               SELECT parent
               FROM tree
START WITH     parent IN (
               SELECT id
               FROM items
               WHERE year     >= 2005
CONNECT BY     parent     = PRIOR item
Unfortunately, I don't have an Oracle 9 database, so I have to test it on a higher version.  I don't believe it uses any features that aren't available in Oracle 9.  In particular, it uses a clumsy and inneficient sub-query in the main WHERE clause instead of CONNECT_BY_ISLEAF, since that pseudo-column was only introduced in Oracle 10.
Finally, I would like to know if this could be done in a single SQL query.Do you mean can it be done without sub-queries?  No, I don't think so.
By the way, I'm using Oracle9i. I tagged my first post with this label. On next posts I'll write it in the text.Good move; there's an excellent chance that people won't notice the tags.  Post the full versions, e.g. Oracle 9.2.0.2.0.  Sometimes the finer divisions are significant.