Get the sum of values and show only max(Date)

Question

Hi,
I have a below query and the value
select PO_No,DATE,RCVD,LINE_QTY,QTY_INVCD,PART_NO from Purchase                         
PO_No     DATE     RCVD LINE_QTY QTY_INVCD     PART_NO
PO1460 12/02/2007 11     20     12     0995-13
PO1460 13/12/2006 4     20     12     0995-13
PO1460 05/04/2007 5     20     12     0995-13
In the above table,
PO_No ,Line_Qty ,Qty_INVCD,Part_No all are same value.
Now I want the sum ( rcvd,line_qty)
i.e.,
Select po_no,date,sum(rcvd) over (partition by line_quantity) RCVD,line_qty,qty_invcd,part_no from Purchase
Its look like
PO_No     DATE     RCVD LINE_QTY QTY_INVCD     PART_NO
PO1460 12/02/2007 20     20     12     0995-13
PO1460 13/12/2006 20     20     12     0995-13
PO1460 05/04/2007 20     20     12     0995-13
Now what I want is
I want the value for only max(Date)
b]PO_No     DATE     RCVD LINE_QTY QTY_INVCD     PART_NO
PO1460 05/04/2007 20     20     12     0995-13
How will I write a query?
Likewise I have many PO_No PO100,PO101,PO102,..........

Answer 1

No need to use subquery to get this result:
WITH data AS (select 'PO1460' po_no, to_date('12/02/2007','dd/mm/yyyy') datum, 20 recvd, 20 line_qty, 12 qty_invcd, '0995-13' part_no FROM dual
UNION all
select 'PO1460', TO_DATE('13/12/2006','dd/mm/yyyy'), 20, 20, 12, '0995-13' FROM dual
UNION all
select 'PO1460', to_date('05/04/2007','dd/mm/yyyy'), 20, 20, 12, '0995-13' FROM dual
UNION all
select 'PO1462', TO_DATE('13/12/2006','dd/mm/yyyy'), 30, 20, 12, '0995-13' FROM dual
UNION all
select 'PO1462', to_date('15/04/2007','dd/mm/yyyy'), 15, 20, 12, '0995-13' FROM dual
UNION all
select 'PO1462', TO_DATE('13/12/2006','dd/mm/yyyy'), 40, 20, 12, '0995-13' FROM dual
UNION all
select 'PO1461', to_date('15/04/2007','dd/mm/yyyy'), 15, 20, 12, '0995-13' FROM dual
UNION all
select 'PO1463', TO_DATE('13/12/2006','dd/mm/yyyy'), 30, 20, 12, '0995-13' FROM dual
UNION all
select 'PO1463', to_date('15/04/2007','dd/mm/yyyy'), 15, 20, 12, '0995-13' FROM dual
SELECT po_no, sum(recvd) keep (dense_rank first ORDER BY datum desc)
FROM data
GROUP BY po_no
will do the same