A tale of two tables (and recursive SQL)

Hey all,

In 8.1.7.2 on HP/UX, a developer has tables T1 and T2 in our manufacturing
(ERP) DB. T1 is a hierarchical bill-of-materials ("BOM") and T2 is the part
master. Of course, we need to recurse down T1, like this:

        SELECT LEVEL, assembly, component, qty
        FROM T1
        START WITH assembly = 'ASSY01'
        CONNECT BY PRIOR component = assembly;

...which works great to get us the exploded BOM. The problem is that we don't want hierarchies in T2 whose "assembly" in T1 has "some_flag" set. In syntactically-incorrect code, we want;

        SELECT LEVEL, assembly, component, qty
        FROM T1
        START WITH assembly = 'ASSY01'
        CONNECT BY PRIOR component = assembly
        AND PRIOR component =
                (SELECT partno
                FROM T2
                WHERE partno = PRIOR component
                AND some_flag = 'Y')

The problem, of course, is that I can't connect the PRIOR component to a table in the subquery.

Anyone have an idea? I can't move that subquery to be outside of the CONNECT BY SELECT because the entire hierarchy below the component whose "some_flag" != 'Y' needs to be ignored (i.e. subcomponents at lower levels may have this flag set to 'Y', but because the parent's was not, we don't want the subcomponents, either).

TIA!

Rich Jesse                          System/Database Administrator
Rich.Jesse_at_qtiworld.com             Quad/Tech International, Sussex, WI USA

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Jesse, Rich
  INET: Rich.Jesse_at_qtiworld.com

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L


(or the name of mailing list you want to be removed from).  You may

also send the HELP command for other information (like subscribing).