Picking a Max value row out of a group of rows.

Question

Hi,
I'm using Oracle 10.2.0.4.0
For some reason I can't come up with a way to pick out a simple row that contains the max date value out of a group of sub group of rows. The following rows are one group of the result of a complex view ordered by ACCOUNT_NUMBER. I'm just showing the first group for Demo Purposes.
CUSTOMER_NAME          ACCOUNT_NUMBER     BOOKED_DATES     OUTSTANDING_APPROVALS     BOOKED_NOT_BILLED         SALES
ABC company, LLC     114943          05/22/2008                   11:17:05           100,072.43          100,072.43
ABC company, LLC     114943          06/30/2008                   15:12:29           129,956.00          129,956.00
ABC company, LLC     114943          07/30/2008                   15:57:16           10,957.00          10,957.00This is just the first of many groups in this view. I just need a simple way to select the row with the max BOOKED_DATES. I've tried everything I could think of but the other two rows are not going away. MAX(BOOKED_DATES) is not working in the HAVING section. I just want my out output to be the rows out of each group with the most recent BOOKED_DATES.
Therefor , my output would be
CUSTOMER_NAME          ACCOUNT_NUMBER     BOOKED_DATES     OUTSTANDING_APPROVALS     BOOKED_NOT_BILLED         SALES
ABC company, LLC     114943          07/30/2008                   15:57:16           10,957.00          10,957.00for ACCOUNT_NUMBER 114943. For the truly curious, the query is below. I'm sure the solution is simple but not to me this day. Maybe it's a Monday thing.
Thanks in Advance.
select  distinct
party.party_name CUSTOMER_NAME, --"Customer Name"
cust_acct.account_number ACCOUNT_NUMBER,--"Account Number"
max(h.BOOKED_DATE)  BOOKED_DATES,-- "Booked Dates",
osa.OUTSTANDING_SALE_AMT    OUTSTANDING_APPROVALS,--"Outstanding Approvals",
ola2.BOOKED_NOT_BILLED                                     BOOKED_NOT_BILLED,
--ola.line_id,
--h.header_id,
sum(nvl(ola.ORDERED_QUANTITY,0) * nvl(ola.UNIT_LIST_PRICE,0))   SALES,
CASE
   WHEN
   invoiced_amt_info.TERMS = 'Current'
    THEN invoiced_amt_info.CURRENT_INV  
   ELSE NULL
END  "CURRENT_IA",--"Current",
CASE
   WHEN
   invoiced_amt_info.TERMS = 'Current'
    THEN invoiced_amt_info.CURRENT_TAX 
   ELSE NULL
END CURRENT_TAX,--"Current Tax",
CASE
   WHEN
   invoiced_amt_info.TERMS = '1-30 days'
    THEN invoiced_amt_info.CURRENT_INV 
   ELSE NULL
END     LT_30_DAYS,--  "1-30 Days",
CASE
   WHEN
   invoiced_amt_info.TERMS = '1-30 days'
    THEN invoiced_amt_info.CURRENT_TAX  
   ELSE NULL
END     LT_30_DAYS_TAX,-- "1-30 Days Tax",
CASE
   WHEN
   invoiced_amt_info.TERMS = '31-60 days'
    THEN invoiced_amt_info.CURRENT_INV 
   ELSE NULL 
END     LT_60_DAYS,-- "1-60 Days",
CASE
   WHEN
   invoiced_amt_info.TERMS = '31-60 days'
    THEN invoiced_amt_info.CURRENT_TAX
   ELSE NULL
END     LT_60_DAYS_TAX,--"1-60 Days Tax",
CASE
   WHEN
   invoiced_amt_info.TERMS = '61-90 days'
    THEN invoiced_amt_info.CURRENT_INV  
   ELSE NULL
END     LT_90_DAYS,-- "1-90 Days",
CASE
   WHEN
   invoiced_amt_info.TERMS = '61-90 days'
    THEN invoiced_amt_info.CURRENT_TAX 
   ELSE NULL
END     LT_90_DAYS_TAX,-- "1-90 Days Tax",
CASE
   WHEN
   invoiced_amt_info.TERMS = '90+ days'
    THEN invoiced_amt_info.CURRENT_INV  
   ELSE NULL 
END     MT_90_PLUS_DAYS,-- "90+ Days",
CASE
   WHEN
   invoiced_amt_info.TERMS = '90+ days'
    THEN invoiced_amt_info.CURRENT_TAX
   ELSE NULL
END     MT_90_PLUS_DAYS_TAX,--"90+ Days Tax",
uc.UNAPPLIED_CASH UNAPPLIED_CASH--"Unapplied Cash"
FROM
oe_order_headers_all        h,
hz_cust_accounts            cust_acct,
hz_parties                  party,
hz_customer_profiles        cust_prof,
oe_order_lines_all ola,
select l.HEADER_ID HEADER_ID,
l.sold_to_org_id SOLD_TO_ORG_ID,
sum(nvl(l.ORDERED_QUANTITY,0) * nvl(l.UNIT_LIST_PRICE,0)) BOOKED_NOT_BILLED
from
oe_order_lines_all l
where
    l.BOOKED_FLAG <> 'N'
AND l.FLOW_STATUS_CODE <> 'CANCELLED'
AND l.INVOICE_INTERFACE_STATUS_CODE <> 'NO'
group by l.HEADER_ID, l.sold_to_org_id
) ola2,
select INV_AMT.aginglayer, INV_AMT.aging TERMS, sum(INV_AMT.due_amount) CURRENT_INV, INV_AMT.CUSTOMER_ID,--due_amount,--invoiced ammount Currrent
          sum(INV_AMT.tax_amount) CURRENT_TAX --tax_amount
           from (
                select  
                        c.customer_name
                      , c.customer_number
                      , c.CUSTOMER_ID
                      , sum(ps.amount_due_remaining) due_amount
                      , sum(ps.tax_remaining) tax_amount
                      , 'Current' aging
                      , 1 aginglayer
                      , 1 showord
                 from ra_customers c
                      , ar_payment_schedules_all ps
                 where ps.status = 'OP'
                   and ps.class <> 'PMT'
                   and trunc(sysdate - ps.due_date) < 1
                   and ps.customer_id = c.customer_id
                 group by c.customer_name
                         , c.customer_number
                         , c.CUSTOMER_ID
                union
                select   
                        c.customer_name
                      , c.customer_number
                      , c.CUSTOMER_ID                     
                      , sum(ps.amount_due_remaining) due_amount
                      , sum(ps.tax_remaining) tax_amount
                      , '1-30 days' aging
                      , 2 aginglayer
                      , 2 showord
                 from ra_customers c
                      , ar_payment_schedules_all ps
                 where ps.status = 'OP'
                   and ps.class <> 'PMT'
                   and trunc(sysdate - ps.due_date) >= 1
                   and trunc(sysdate - ps.due_date) <= 30
                   and ps.customer_id = c.customer_id
                 group by c.customer_name
                         , c.customer_number
                         , c.CUSTOMER_ID                     
                union
                select  
                        c.customer_name
                      , c.customer_number
                      , c.CUSTOMER_ID                     
                      , sum(ps.amount_due_remaining) due_amount
                      , sum(ps.tax_remaining) tax_amount
                      , '31-60 days' aging
                      , 3 aginglayer
                      , 3 showord
                 from ra_customers c
                      , ar_payment_schedules_all ps
                 where ps.status = 'OP'
                   and ps.class <> 'PMT'
                   and trunc(sysdate - ps.due_date) > 30
                   and trunc(sysdate - ps.due_date) <= 60
                   and ps.customer_id = c.customer_id
                 group by c.customer_name
                         , c.customer_number
                         , c.CUSTOMER_ID
                union
                select  
                        c.customer_name
                      , c.customer_number
                      , c.CUSTOMER_ID                     
                      , sum(ps.amount_due_remaining) due_amount
                      , sum(ps.tax_remaining) tax_amount
                      , '61-90 days' aging
                      , 4 aginglayer
                      , 4 showord
                 from ra_customers c
                      , ar_payment_schedules_all ps
                 where ps.status = 'OP'
                   and ps.class <> 'PMT'
                   and trunc(sysdate - ps.due_date) > 60
                   and trunc(sysdate - ps.due_date) <= 90
                   and ps.customer_id = c.customer_id
                 group by c.customer_name
                         , c.customer_number
                         , c.CUSTOMER_ID                        
                union
                select  
                        c.customer_name
                      , c.customer_number
                      , c.CUSTOMER_ID                     
                      , sum(ps.amount_due_remaining) due_amount
                      , sum(ps.tax_remaining) tax_amount
                      , '90+ days' aging
                      , 5 aginglayer
                      , 5 showord
                 from ra_customers c
                      , ar_payment_schedules_all ps
                      , ra_customer_trx_all trx
                      , ra_cust_trx_types_all types
                 where ps.status = 'OP'
                   and ps.class <> 'PMT'
                   and trunc(sysdate - ps.due_date) > 90
                   and ps.customer_id = c.customer_id
                   and trx.customer_trx_id = ps.customer_trx_id
                   and types.cust_trx_type_id = trx.cust_trx_type_id
                   and types.name <> 'CSG-Conversion Pmt'
                   and types.org_id= 1
                 group by c.customer_name
                         , c.customer_number
                         , c.CUSTOMER_ID
                ) INV_AMT
             group by aginglayer, aging, showord, INV_AMT.CUSTOMER_ID
) invoiced_amt_info,
select   ra_cust.customer_name CUSTOMER_NAME, ra_cust.customer_number CUSTOMER_NUMBER, ra_cust.customer_id CUSTOMER_ID,
                 sum(pay_sched.amount_due_remaining) UNAPPLIED_CASH
           from  ra_customers ra_cust
                , ar_payment_schedules_all pay_sched
           where
             pay_sched.status = 'OP'
             and pay_sched.class = 'PMT'
             and pay_sched.due_date > trunc(sysdate - 365)
             and pay_sched.customer_id = ra_cust.customer_id
           group by ra_cust.customer_name, ra_cust.CUSTOMER_NUMBER, ra_cust.CUSTOMER_ID
) uc,
select   qh.cust_account_id CUST_ACCOUNT_ID,    sum(qh.total_quote_price) OUTSTANDING_SALE_AMT
from ASO_QUOTE_HEADERS_ALL qh,ASO_QUOTE_STATUSES_TL st
where st.quote_status_id = qh.quote_status_id
and st.meaning ='Credit Hold'
group by qh.cust_account_id
) osa          
Where 
     h.HEADER_ID = ola.HEADER_ID
AND h.HEADER_ID = ola2.HEADER_ID
AND ola.sold_to_org_id = cust_acct.cust_account_id(+)
AND ola2.sold_to_org_id = ola.sold_to_org_id(+)
AND cust_acct.party_id = party.party_id(+)
AND cust_acct.CUST_ACCOUNT_ID = cust_prof.CUST_ACCOUNT_ID(+)
AND cust_prof.party_id = party.party_id
AND cust_prof.CUST_ACCOUNT_ID = invoiced_amt_info.CUSTOMER_ID(+)
AND cust_prof.CUST_ACCOUNT_ID = uc.CUSTOMER_ID(+)
AND cust_prof.CUST_ACCOUNT_ID = osa.CUST_ACCOUNT_ID(+)
group by  party.party_name, cust_acct.account_number, invoiced_amt_info.TERMS, osa.OUTSTANDING_SALE_AMT,
ola2.BOOKED_NOT_BILLED,
invoiced_amt_info.CURRENT_INV,
invoiced_amt_info.CURRENT_TAX, uc.UNAPPLIED_CASH
order by party.party_name

Answer 1

Example
--Sample Data
SQL>select deptno, empno, sal,
  2     max(sal) over ( partition by deptno order by deptno) mv
  3* from emp
SQL> /
    DEPTNO      EMPNO        SAL         MV
        10       7782       2450       5000
        10       7839       5000       5000
        10       7934       1300       5000
        20       7566       2975       3000
        20       7902       3000       3000
        20       7876       1100       3000
        20       7369        800       3000
        20       7788       3000       3000
        30       7521       1250       2850
        30       7844       1500       2850
        30       7499       1600       2850
        30       7900        950       2850
        30       7698       2850       2850
        30       7654       1250       2850
14 rows selected.
SQL>select * from
  2  (
  3  select deptno, empno, sal,
  4     max(sal) over ( partition by deptno order by deptno) mv
  5  from emp
  6* ) where sal = mv
SQL> /
    DEPTNO      EMPNO        SAL         MV
        10       7839       5000       5000
        20       7902       3000       3000
        20       7788       3000       3000
        30       7698       2850       2850SS