Status of part query help

Question

Hi, I have a part, and it can be received, accepted, rejected, corrected and shipped. This is held in the status field. It is on the line level, so each part also has a line number associated with the transactions status, i.e.
Part PO Line Status
12345 1 Received
12345 2 Rejected
I need to know how many parts for each po line only have a status of rejected. They must never have been received, rejected, corrected or shipped, only received.
I don't know where to begin, thank you for any help.

Answer 1

Hi,
The query I posted doesn't consider the order of events at all. As posted, it finds 'Rejected' rows without a matching 'Corrected' or 'Shipped' row, regardless of which came first.
If order is important, you might be able to modify the query I posted.
For example, the query below finds 'Rejected' rows that were not followed by "Corrected' or 'Shipped': any status *before* the 'Rejected' (sorting by po_line) is okay:
{code}
SELECT     *
FROM     part_table     m     -- m for main
WHERE     status     = 'Rejected'
AND     NOT EXISTS (     SELECT     1
               FROM     part_table
               WHERE     part     = m.part
               AND     status     IN ('Corrected', 'Shipped')
               AND     po_line     > m.po_line          -- <== NEW
{code}
Depending on what you need to do, there might be better ways.
Boneist had a good idea: post some sample data, showing different situations that you need to handle, and the results you want from that data.