Oracle Update with Joins - oracle

Question

I'm trying to convert few MS Access Queries into Oracle. Following is one of the query from MS Access.
UPDATE [RESULT] INNER JOIN [MASTER]
ON ([RESULT].[LAST_NAME] = [MASTER].[LAST_NAME])
AND ([RESULT].[FIRST_NAME] = [MASTER].[FIRST_NAME])
AND ([RESULT].[DOCUMENT_NUMBER] = [MASTER].[DOCUMENT_NUMBER])
AND ([RESULT].[BATCH_ID] = [MASTER].[LEAD_ID])
SET [MASTER].[CLOSURE_REASON] = "Closed For Name and Document Number Match",
[MASTER].[RESULT_ID] = [RESULT].[ID],
[MASTER].[RESULT_PID] = [RESULT].[PID]
WHERE (([MASTER].[CLOSURE_REASON] Is Null)
AND ([MASTER].[REC_CODE] = "A1")
AND ([RESULT].[EVENT_DATE] = [MASTER].[EVENT_DATE])
AND ([RESULT].[EVENT_TYPE] = "Open")
AND ([MASTER].[DOCUMENT_NUMBER] Is Not Null)
AND ([MASTER].[DOCUMENT_NUMBER)] "null"));
First I received ORA-01779: cannot modify a column which maps to a non key-preserved table Error. I followed different examples (including MERGE) from your site and modified my original query. Now, I receive ORA-30926: unable to get a stable set of rows in the source tables Error.
Most of the examples showed only one join between the tables but I have to make more joins based on my requirements.
Any help translating this query in to Oracle would be Great. Thanks!

Answer 1

I believe this should be equivalent.
UPDATE master m
SET closure_reason = 'Closed For Name and Document Number Match',
(result_id, result_pid) = (SELECT r.id, r.pid
FROM result r
WHERE m.last_name = r.last_name
AND m.first_name = r.first_name
AND m.lead_id = r.batch_id
AND m.document_number = r.document_number
AND m.event_date = r.event_date
AND r.event_type = 'Open')
WHERE m.closure_reason IS NULL
AND m.rec_code = 'A1'
AND m.document_number IS NOT NULL
AND m.document_number != 'null'
AND EXISTS( SELECT 1
FROM result r
WHERE m.last_name = r.last_name
AND m.first_name = r.first_name
AND m.lead_id = r.batch_id
AND m.document_number = r.document_number
AND m.event_date = r.event_date
AND r.event_type = 'Open' )
Obviously, however, this isn't tested. If you could post the DDL to create your tables, the DML to insert a few rows, and show the expected result, we could test our code and would likely be able to give you more accurate answers.