How to find the most recent date prev?

Hello

Here is the sample table and sample data.
CREATE TABLE t1 (code NUMBER, dt DATE, price NUMBER)
/
Insert into T1 (CODE, DT, PRICE) Values (1, TO_DATE('10/21/2012', 'MM/DD/YYYY'), 10);
Insert into T1 (CODE, DT, PRICE) Values (1, TO_DATE('10/22/2012', 'MM/DD/YYYY'), 10);
Insert into T1 (CODE, DT, PRICE) Values (1, TO_DATE('10/23/2012', 'MM/DD/YYYY'), 12);
Insert into T1 (CODE, DT, PRICE) Values (1, TO_DATE('10/24/2012', 'MM/DD/YYYY'), 9);
Insert into T1 (CODE, DT, PRICE) Values (1, TO_DATE('10/25/2012', 'MM/DD/YYYY'), 8);
Insert into T1 (CODE, DT, PRICE) Values (1, TO_DATE('10/26/2012', 'MM/DD/YYYY'), 13);
Insert into T1 (CODE, DT, PRICE) Values (1, TO_DATE('10/27/2012', 'MM/DD/YYYY'), 11);
Insert into T1 (CODE, DT, PRICE) Values (1, TO_DATE('10/28/2012', 'MM/DD/YYYY'), 15);
Insert into T1 (CODE, DT, PRICE) Values (2, TO_DATE('10/29/2012', 'MM/DD/YYYY'), 15);
Insert into T1 (CODE, DT, PRICE) Values (1, TO_DATE('10/30/2012', 'MM/DD/YYYY'), 13);
Insert into T1 (CODE, DT, PRICE) Values (1, TO_DATE('10/31/2012', 'MM/DD/YYYY'), 13);
COMMIT;
I have to read the table so that I got when I read a line of CODE = 1 for DT = 30 - OCT - 2012, I have to check what was the price for the CODE = 1 in the most recent previous date (which is October 28, 2013). Then I will compare the two prices (for 30 Oct 28th) and fill out another table.

I hope I have described the situation well.

Could someone help me with this please?

My actual table contains a few million lines in DEV env and a lot more in PROD.

Thanks in advance!

If you use the analytical function LAG you can 'Watch' data of previous lines...

SQL> ed
Wrote file afiedt.buf

  1  select code, dt, price
  2        ,lag(price) over (partition by code order by dt) as prev_price
  3* from t1
SQL> /

      CODE DT                        PRICE PREV_PRICE
---------- -------------------- ---------- ----------
         1 21-OCT-2012 00:00:00         10
         1 22-OCT-2012 00:00:00         10         10
         1 23-OCT-2012 00:00:00         12         10
         1 24-OCT-2012 00:00:00          9         12
         1 25-OCT-2012 00:00:00          8          9
         1 26-OCT-2012 00:00:00         13          8
         1 27-OCT-2012 00:00:00         11         13
         1 28-OCT-2012 00:00:00         15         11
         1 30-OCT-2012 00:00:00         13         15
         1 31-OCT-2012 00:00:00         13         13
         2 29-OCT-2012 00:00:00         15

11 rows selected.

Tags: Database

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    1684672 28 JANUARY 09
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  3     select 1684662 as id, to_date('26-JAN-09','dd-mon-yyyy') as the_date from dual union all
  4     select 1424097 as id, to_date('27-JAN-09','dd-mon-yyyy') as the_date from dual union all
  5     select 1684663 as id, to_date('27-JAN-09','dd-mon-yyyy') as the_date from dual union all
  6     select 1684664 as id, to_date('27-JAN-09','dd-mon-yyyy') as the_date from dual union all
  7     select 1684672 as id, to_date('28-JAN-09','dd-mon-yyyy') as the_date from dual union all
  8     select 0689073 as id, to_date('28-JAN-09','dd-mon-yyyy') as the_date from dual union all
  9     select 1052476 as id, to_date('21-JAN-09','dd-mon-yyyy') as the_date from dual union all
 10     select 1052476 as id, to_date('21-JAN-09','dd-mon-yyyy') as the_date from dual union all
 11     select 1360828 as id, to_date('23-JAN-09','dd-mon-yyyy') as the_date from dual union all
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 14     select 1052476 as id, to_date('30-JAN-09','dd-mon-yyyy') as the_date from dual union all
 15     select 1052476 as id, to_date('30-JAN-09','dd-mon-yyyy') as the_date from dual union all
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           1052476 30-JAN-0009 12 00:00
           1052476 30-JAN-0009 12 00:00
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           1684663 27-JAN-0009 12 00:00
           1684664 27-JAN-0009 12 00:00

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------------------ --------------------------
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Elapsed: 00:00:00.03

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