Point in time snapshot

Question

Hi,
I'm very new to Oracle and this is my first post so if I miss anything important, please excuse my ignorance...
We have a Oracle 10g datawarehouse which contains service desk data on tickets, agent performance etc.
I'm specifically trying to obtain a count of tickets that were in an active status and were sat with a certain group at a certain point in time.
The table TICKETS contains the usual ticket data, ticketnumber, open date, close date etc and the refgroup field which indicates current group ownership.
The select statement below works for all tickets currently owned by Group1 that were active (not closed) at 00:00:00 on Monday but doesn't take into account changes in group ownership so a ticket could be counted by the statement on first run but if the group changes, it will not be included.
We have a table which records SLA events for each ticket such as (but not only) group transfers and the date each transfer took place and this table is linked from the TICKETS table via a ticket ID field in each.
Each row in this table has a GroupName value to show the group responsible for each event, as in the below example.
If for example the snapshot date is 13/07/09 00:00:00, is there a way to calculate from the SLA events records as below, whether Ticket1 fits this criteria?
This is basically an expression field in Crystal Reports so I can work with either a field that returns a 1 or 0 at the ticket level and then count within the app, or a field that returns a total count of all tickets that fit this criteria.
Thanks alot in advance.
Andy.
TicketNumber GroupName EventDateTime
Ticket1 Group1 09/07/09 08:43:21
Ticket1 Group1 09/07/09 14:28:35
Ticket1 Group2 14/07/09 13:12:10
SELECT
COUNT(TICKETNUMBER)
FROM
"ORGANIZATION"
INNER JOIN "TICKETS"
ON "ORGANIZATION"."ORG_ID" = "TICKETS"."ORGANISATION_FK"
WHERE
"ORGANIZATION"."ORG_NAME" = 'Org1'
AND "TICKETS"."REFGROUP" = 'Group1'
AND
"TICKETS"."OPEN_DATE" < LEAST(TRUNC(SYSDATE),TRUNC(SYSDATE,'IW'))
AND "TICKETS"."CLOSE_DATE" > LEAST(TRUNC(SYSDATE),TRUNC(SYSDATE,'IW'))
OR
"TICKETS"."OPEN_DATE" < LEAST(TRUNC(SYSDATE),TRUNC(SYSDATE,'IW'))
AND "TICKETS"."STATUS" <> 'Closed'
)

Answer 1

Hi,
user11696977 wrote:
Thanks again Frank.
Looking at the doc you linked I think this query should do what I'm after but running it gives me an insufficient priviledges error.In case you're wondering what privileges are ineeded, under "SELECT - Prerequisites" the [SQL Language manual|http://download.oracle.com/docs/cd/B28359_01/server.111/b28286/statements_10002.htm#i2065699] says:
"To issue an Oracle Flashback Query using the flashback_query_clause, you must have the SELECT privilege on the objects in the select list. In addition, either you must have FLASHBACK object privilege on the objects in the select list, or you must have FLASHBACK ANY TABLE system privilege."
Will have to see how this goes if I can get priviledges assigned to the account I'm using.
SELECT
COUNT(TICKETNUMBER)
FROM
"ORGANIZATION"
AS OF TIMESTAMP LEAST(TRUNC(SYSDATE),TRUNC(SYSDATE,'IW'))
INNER JOIN "TICKETS"
ON "ORGANIZATION"."ORG_ID" = "TICKETS"."ORGANISATION_FK"
WHERE
"ORGANIZATION"."ORG_NAME" = 'Org1'
AND "TICKETS"."REFGROUP" = 'Group1'
AND "TICKETS"."STATUS" <> 'Closed'
Looks good.
This will join the organization table as it exsited at 00:00 on Monday to the tickets table as it exists at run-time.
TRUNC (dt, x) is never later than dt, so you can just say
AS OF TIMESTAMP TRUNC(SYSDATE, 'IW')