Want a query to see only the changes data of a specific no.

Question

here are the table sturcucture and data for the table:
create table import_lc (
LC_NO varchar2(20),
AMEND_NO varchar2(2),
USANCE_PERIOD number,
AMT_FCY number,
AMT_LCY number,
SHIPMENT_PERIOD number,
EXPIRY_DATE date,
EXPIRY_PLACE varchar2(50));
Insert into FE_IMPORT_LC
(LC_NO, AMEND_NO, USANCE_PERIOD, AMT_FCY, AMT_LCY, SHIPMENT_PERIOD, EXPIRY_DATE,
EXPIRY_PLACE)
Values
('1', '1', 90, 10000, 500000, 15, TO_DATE('02/13/2008 00:00:00', 'MM/DD/YYYY
HH24:MI:SS'), 'DHAKA');
Insert into FE_IMPORT_LC
(LC_NO, AMEND_NO, USANCE_PERIOD, AMT_FCY, AMT_LCY, SHIPMENT_PERIOD, EXPIRY_DATE,
EXPIRY_PLACE)
Values
('1', '2', 90, 10000, 500000, 30, TO_DATE('03/13/2008 00:00:00', 'MM/DD/YYYY
HH24:MI:SS'), 'DHAKA');
Insert into FE_IMPORT_LC
(LC_NO, AMEND_NO, USANCE_PERIOD, AMT_FCY, AMT_LCY, SHIPMENT_PERIOD, EXPIRY_DATE,
EXPIRY_PLACE)
Values
('2', '1', 90, 15000, 800000, 30, TO_DATE('01/19/2008 00:00:00', 'MM/DD/YYYY
HH24:MI:SS'), 'DHAKA');
Insert into FE_IMPORT_LC
(LC_NO, AMEND_NO, USANCE_PERIOD, AMT_FCY, AMT_LCY, SHIPMENT_PERIOD, EXPIRY_DATE,
EXPIRY_PLACE)
Values
('2', '2', 120, 20000, 1000000, 30, TO_DATE('01/19/2008 00:00:00', 'MM/DD/YYYY
HH24:MI:SS'), 'DHAKA');
COMMIT;
NOW, if u see the table data, u see,
for lc_no=1; only the shipment_period and expiry_date has been changed with the
amend_no.
NOW, if u see the table data, u see,
for lc_no=2; only the amt_fcy and amt_lcy has been changed with the amend_no.
there could be many more columns like these where the data can change with the
amend_no but the lc_no will be the same.
now, i want to make a query by which i can see only the changes column value for a
particular lc_no and maximum amend_no for that lc_no.
& result data should be from the maximum amend_no for that lc_no.
like:
for lc_no = 1 ;
SHIPMENT_PERIOD EXPIRY_DATE
30          13-03-2008
And for lc_no = 2 ;
USANCE_PERIOD     AMT_FCY     AMT_LCY
120          20000     1000000

Answer 1

I'm not sure that I completely understand your requirement, but here's something that should, at the very least, get you started. If you don't know what the LAG function does, look it up in the documentation.
SELECT lc_no,
       amend_no,
       usance_period,
       amt_fcy,
       amt_lcy,
       shipment_period,
       expiry_date,
       expiry_place
FROM   (SELECT lc_no,
               amend_no,
               CASE
                 WHEN usance_period <> LAG (usance_period) OVER (PARTITION BY lc_no ORDER BY amend_no) THEN usance_period
               END usance_period,
               CASE
                 WHEN amt_fcy <> LAG (amt_fcy) OVER (PARTITION BY lc_no ORDER BY amend_no) THEN amt_fcy
               END amt_fcy,
               CASE
                 WHEN amt_lcy <> LAG (amt_lcy) OVER (PARTITION BY lc_no ORDER BY amend_no) THEN amt_lcy
               END amt_lcy,
               CASE
                 WHEN shipment_period <> LAG (shipment_period) OVER (PARTITION BY lc_no ORDER BY amend_no) THEN shipment_period
               END shipment_period,
               CASE
                 WHEN expiry_date <> LAG (expiry_date) OVER (PARTITION BY lc_no ORDER BY amend_no) THEN expiry_date
               END expiry_date,
               CASE
                 WHEN expiry_place <> LAG (expiry_place) OVER (PARTITION BY lc_no ORDER BY amend_no) THEN expiry_place
               END expiry_place,
               rn
        FROM   (SELECT lc_no,
                       amend_no,
                       usance_period,
                       amt_fcy,
                       amt_lcy,
                       shipment_period,
                       expiry_date,
                       expiry_place,
                       ROW_NUMBER () OVER (PARTITION BY lc_no ORDER BY amend_no DESC) rn
                FROM   fe_import_lc)
        WHERE  rn <= 2)
WHERE  rn = 1