Query problem, two working queries how to left join together?

Question

Hello,
I have a two queries that I have been trying to put together for a couple days. I'm frazzled. Hopefully you can help.
The first query returns all rows from the database. The second query returns only one row (because the way it is currentlly set up in the Where clause). So I know that will have to change. For each row returned in Query1, I need the two fields from Query2 included
(so the link would be through client.Id (which is an indexed field) or client.Accountnumber?
This query, returns all records in the database:
Select client.Id, client.accountnumber, client.Namelast,
dmlocation.city ||', '||dmlocation.state as CityState,
client.salesTerritory_client ||'-'|| dmuser.namefirst_user ||' '|| dmuser.namelast_user as Territory,
MaxDates.LastRun, client.creditrisk, client.customercategory
from client
Left join fctclientcoverage on fctclientcoverage.client_id = client.id
Left join dmlocation on fctclientcoverage.location_id = dmlocation.id
Left join dmuser on dmuser.id = client.id
Left join (Select to_char(Max(dmdate.calendardate),'MM/DD/YY') as LastRun, Client.Id
from dmdate, client, fctadorder
where dmdate.id = fctadorder.lastinsert_date_id and client.id = fctadorder.primaryorderer_client_id
group by client.id) MaxDates ON client.id = MaxDates.Id
where(fctclientcoverage.Ccoverrecordstopdate Is Null)
Order by client.namelast;
Query 2, only returns 1 row, so for each row returned above, the two fields selected in this query should accompany each row. But how to link these two selects using the client.accountnumber (or perhaps by dmcliet.id)?
Select booked.CurRev, booked.LastRev from (
Select (sum(Case When dmDate.CalendarDate >= '29-DEC-2008' and dmDate.CalendarDate < '
Then fctinsertchargedetail.Amount_insertDetail Else 0 End)) As CurRev,
(sum(Case When dmDate.CalendarDate >= '29-DEC-2007' and dmDate.CalendarDate < '
Then fctinsertchargedetail.Amount_insertDetail Else 0 End)) As LastRev
from fctAdorder
Inner Join client On fctAdorder.primaryorderer_client_id = client.id
Inner Join fctinsertion On fctAdorder.id=fctinsertion.fctAdorder_id
Inner Join fctinsertchargesummary On fctinsertion.id=fctinsertchargesummary.insertion_id
Inner Join dmDate On fctinsertion.insert_date_id=dmDate.id
Inner Join fctinsertchargedetail On fctinsertchargesummary.id=fctinsertchargedetail.insertchargesummary_id
WHERE client.accountnumber = '12345678' and
dmDate.CalendarDate >= '29-DEC-2007' And dmDate.CalendarDate < ') booked;
Thanks for your time.

Answer 1

Yes, You are correct!
I just recently got the query working with the aid of another forum.
The sad part is, all though the first query took 11 seconds to return 180,000 rows (thats good); The second query took 4 minutes to calculate and return all it's rows (that's bad). Together the query ran for over 4 minutes. Way too slow.
Being brand new to oracle I have to try and figure away to cut this time down. Perhaps I'm not considering something?
I orginally brought into my .net app the results from the first query and then in the rowdatabound event I queried each row to get the information needed from the second query. That was way too slow also. It was recommended to try and return all needed data at once.
I've been given a task to emulate a current application, (which I do not have access to it's code), that brings back all of this same information that I am using. It only takes them maybe 15 seconds to run, to bring back all. Of course they were experienced oracle sql developers.
So I guess my next step is to try and improve that second query. Thanks for replying to this Frank. I'll be back. Are you or is anyone good at knowing how to optimzie queries? I'm reading a book now trying out suggestions. Nothing is working yet.
thanks