How to extract a subassembly from a bom table

Question

Hello,
I am completely stumped on what to do. Please help!
The have a table called bom table.My goal is to extract a sub the subassembly based from a "top_level" and "component".
This is what the table looks like:
top_level | sequence | level | component | make_buy | Revision
topitem1 | 0 | 0 | topitem1 | Make | A
topitem1 | 1 | 1 | subassembly1 | Make | A
topitem1 | 2 | 2 | component1 | Buy | A
topitem1 | 3 | 2 | component2 | Make | B
topitem1 | 4 | 3 | component3 | Buy | A
topitem1 | 5 | 1 | subassembly2| Make | A
topitem1 | 6 | 2| component4 | Buy | A
The result I would like if I extract "subassembly1" should be:
topitem1 | 1 | 1 | subassembly1 | Make | A
topitem1 | 2 | 2 | component1 | Buy | A
topitem1 | 3 | 2 | component2 | Make | B
topitem1 | 4 | 3 | component3 | Buy | A
The result I would like if I extract "subassembly2" should be:
topitem1 | 5 | 1 | subassembly2| Make | A
topitem1 | 6 | 2| component4 | Buy | A
Thank you

Answer 1

Hi,
This gets the results you requested from the sample data:
SELECT     *     -- or whatever
FROM     table_x
START WITH     toplevel     = :target_toplevel
     AND     component     = :target_component
CONNECT BY     toplevel     = PRIOR toplevel
     AND     sqnc          = PRIOR sqnc + 1
     AND     lvl          > (
                      SELECT  lvl
                      FROM       table_x
                      WHERE       toplevel     = :target_toplevel
                      AND       component     = :target_component
                      );I don't know enough about your requirements or your data to say if it will work in all cases.
Edited by: Frank Kulash on May 21, 2009 7:54 PM