Question

I was hoping someone could help me in resolving this issue.

I have 3 tables.

Every table has an ID that I can use to connect all of them together. Those ID’s are not the same ones, but they work and connect to each other alright.

What I need to get is LATEST update date (timestamp) for certain product number (could be more than one product) what was status for it.

Here are how tables look like (they are much more complex, but i simplified them)

mercury.cs_batch_event
PRODUCT_ID (VARCHAR2(100 CHAR))
CBL_REQUEST_ID (VARCHAR2(12 CHAR))

mercury.cs_status_srch
CBL_REQUEST_ID (VARCHAR2(12 CHAR))
LOG_ID  (VARCHAR2(12 CHAR))
STATUS_REF_ID (NUMBER(8,0))

mercury.edit_log
ELOG_ID (VARCHAR2(12 CHAR))
ON_DATE_TIME (TIMESTAMP(6))

I tried doing it several different ways, and after searching for a while on the internet, closest i could get to was this:

SELECT * 
FROM (SELECT cbl.product_id, src.status_ref_id,
             TO_CHAR(elog.on_date_time, 'dd/mm/yyyy hh24:mi:ss') date_updated
      FROM mercury.cs_batch_event cbl,
           mercury.cs_status_srch src, 
           mercury.edit_log elog
      WHERE cbl.product_id IN ('A555', 'B555')
        AND cbl.cbl_request_id = src.cbl_request_id
        AND src.log_id = elog.elog_id
      ORDER BY elog.on_date_time DESC)
WHERE rownum = 1

And it returned below which is correct, but when several product numbers are inserted it still returns value for only one product (Which is because of the row number=1 probably)

PRODUCT_NUMBER  DATE_UPDATED        STATUS
A555            29/06/2011 07:51:24 30169

Thanks

Answer 1

This should do it:

SELECT 
  t1.product_number, 
  t2.status, 
  TO_CHAR (t3.update_time, 'dd/mm/yyyy hh24:mi:ss') date_updated,
FROM 
  batch_event t1, 
  status_srch t2, 
  edit_log t3
WHERE 
  t1.product_number in ('A555', 'B555')
  AND t1.ID_1 = t2.ID_1
  AND t2.ID_2 = t3.ID_2
  AND t3.update_time = (SELECT max(update_time) 
                        FROM edit_log 
                        WHERE ID_2 = t3.ID_2)

Ahh, think I misunderstood your data.. Try this instead:

SELECT 
  t1.product_number,
  t2.status,
  t3.update_time
FROM 
  batch_event t1, 
  status_srch t2, 
  edit_log t3,
(
    SELECT 
      batch_event.product_number product_number, 
      max(edit_log.update_time) maxupdatetime,
    FROM 
      batch_event, 
      status_srch, 
      edit_log
    WHERE 
      batch_event.ID_1 = status_srch.ID_1
      AND status_srch.ID_2 = edit_log.ID_2
    GROUP BY
      batch_event.product_number
) t4
WHERE t1.ID_1 = t2.ID_1
AND t2.ID_2 = t3.ID_2
AND t1.product_number = t4.product_number
AND t3.update_time = t4.maxupdatetime