Need help about designing a query.

Dear All,
I have the following table structure
Fields: issue_id, event_id, event_date
One or more events are related to each issue and each event is associated with a date.
There is a huge data in the table and I want to access the last event date of each date.
The resultant table/view should have following fields:
issue_id, last_event_date
Is this possible using a single/multiple queries or I have to do PL/SQL coding?
Please help.
-Sameer

If you are looking for last event date of an issue then a simple group by query should do it.
SELECT issue_id,max(event_date) last_event_date
FROM my_table
GROUP BY issue_id

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Query #1:
======================
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==================
UPDATE work_order_fact_all_yesterday g
SET returns_count = 1
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FROM (SELECT a.phone_dim_key AS transactional_phone_dim_key,
b.mdn_number AS transactional_mdn_number,
b.account_number AS transactional_account_number
FROM work_order_fact_all_yesterday a INNER JOIN phone_dim b ON a.phone_dim_key = b.phone_dim_key
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FROM work_order_activity_fact
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SELECT phone_dim_key
FROM work_order_fact_all_yesterday
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ON e.transactional_mdn_number = f.historical_mdn_number
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I ran the DBMS_SQLTUNE on it for 10g and did not get any advice. How can I tune the above queries? Thanks!

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Hi ,
I have the following query to pull out data for a particular timeperiod( campaign)
select
da.acct_nr,smas.mrkt_id,smas.fld_sls_cmpgn_perd_id,smas.acct_key,smas.upln_acct_key,smas.awrd_sls_amt,smas.fld_net_sls_amt
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join codi.dim_acct da1
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No i want to modify the query to pull out data for 3 such campaigns.
for a smas.acct_key
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smas.acct_key all the data for 1st campaign , all the data for 2nd campaign. all the data for 3rd campaign
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Thanks

How about this ??
select da.acct_nr,
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       smas.stf_ind,
       da1.acct_nr,
       prev.*
From cdw.sum_mrkt_acct_sls smas
join codi.dim_acct da on (smas.mrkt_id = da.mrkt_id and
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join codi.dim_acct da1 on (smas.mrkt_id = da1.mrkt_id and
                            smas.UPLN_acct_key = da1.ACCT_KEY)
where smas.acct_key in (select dwnln_acct_key
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                            and root_upln_acct_key =
                                (select acct_key
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                                  where acct_nr = '0032622'
                                    and mrkt_id = 66))
   and smas.mrkt_id = 66
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I have a table T1 with values like
col1
1
2
3
4
I need to write insert statment for t2 as
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AA 3
AA 4
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Need your help in refining the query further more.
table structure
Mskey Col A Col B
1   empno [20141127-20151128]1234
1   empno [20151201-99991231]232544
1   salutation [20141127-99991231]Mrs
1   salutation [20151127-99991231]Mr
2   empno [20141127-20151128]1234
2   empno [20151201-99991231]232544
2   salutation [20141127-99991231]Mrs
2   salutation [20151127-99991231]Mr
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user details may be varying from time to time as new data would be pushed through HR systems to identity store via an interface.
The job is getting failed whenever there is any overlapping with dates. So we proactively decided to schedule a job in this regards which runs weekly and would let us know for which and all the users there is overlapping dates are there, so that we can send the list to HR team for pushing new data.
Overlapping Issue Example:
The users employee id for an year it is 1234 and later he moved to another department and his employee id got changed and it became 2345 remaining all details are same. So the HR systems send the data for this user as empno - [20141127-20151128]1234 and empno - [20151201-99991231]232544
it means from 20141127 to 20151128 his employee no is 1234 and from 20151201 to 99991231 his employee would be 2345.
This is a correct case and the tool would accept this data.
the below cases are invald
Case 1: 1 salutation [20141127-99991231]Mrs 1 salutation [20151127-99991231]Mr
Case 2: 2 salutation [20141127-99991231]Mrs 2 salutation [20141127-99991231]Mr
So we wanted to find these overlapping records from tables.
My Query:
I am able to successfully write query for the case 2 type but unable to write for case1.
select id,colA
count(left(ColB,CHARINDEX(']',ColB))) as 'Count'
from tblA with (nolock)
where id in (Select distinct id from tblb with (nolock))
group by id, cola,left(ColB,CHARINDEX(']',ColB))
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Finally got the required answer with the below query
WITH Cte AS
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AND c1.ID=c2.ID
AND c1.ColA=c2.ColA
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