Re: Help Need to build this logic

pankaj_wolfhunter_at_yahoo.co.in wrote:
> Greetings,
>
> Table Structure:
>
> Table1
> symbol orders ttime
>
> Requirement: Want to arrange all records, symbolwise, based on orders
> (asc order).
> Among that, if a particular symbol have records in the range TTIME
> BETWEEN 9300 AND 1530, then
> I want to extract MIN(TTIME) within that range else MIN(TTIME) of
> whatever available records.
>
> I want to achieve this using a single query.
>
> Example:
>
> Table1
>
> symbol orders ttime
> A 2 9300
> A 2 9450
> A 2 1030
> A 2 9451
> A 2 1530
> A 2 1600
> A 2 1700
> B 3 9300
> B 4 1600
> C 3 1600
>
> I want to get all records with maximum orders (in desc order) for each
> symbol.
>
> Output:
> Symbol Orders ttime
>
> A 2 9300
> A 2 9450
> A 2 9451
> A 2 1030
> A 2 1530
> A 2 1600
> A 1 9300
> A 2 1700
> B 4 9300
> B 4 1600
> C 3 1600
>
> Out of this subset I want to get all records with ttime falling between
> 9450 to 1530 to appear first in asc. if there is no record within this
> range
> then I want to go for normal asc order on ttime.
>
> Ouput:
> Symbol Orders ttime
> A 2 9450
> A 2 1030
> A 2 1530
> A 2 1600
> A 2 9300
> B 4 9450
> B 4 1030
> B 4 1600
> C 3 1600
>
> Finally I want to extract only first record
>
> Final output:
> A 2 9450
> B 4 9300
> C 3 1600
>
> Any help would be appreciated.
>
> TIA
Several entries in your post do not make logical sense:

• BETWEEN 9300 AND 1530
• > A 2 1600 > A 1 9300 > A 2 1700

Are we dealing with time here? When is 9300 less than 1530? Why is 1 included in the above?

The set up:
CREATE TABLE T1 (
  SYMBOL CHAR(1),
  ORDERS NUMBER(10),
  TTIME NUMBER(10));

INSERT INTO T1 VALUES('A',2,9300);
INSERT INTO T1 VALUES('A',2,9450);
INSERT INTO T1 VALUES('A',2,10300);
INSERT INTO T1 VALUES('A',2,9451);
INSERT INTO T1 VALUES('A',2,15300);
INSERT INTO T1 VALUES('A',2,16000);
INSERT INTO T1 VALUES('A',2,17000);
INSERT INTO T1 VALUES('B',3,9300);
INSERT INTO T1 VALUES('B',4,16000);
INSERT INTO T1 VALUES('C',3,16000);

First, lets find the maximum value for ORDERS for each SYMBOL: SELECT
  SYMBOL,
  MAX(ORDERS) OVER (PARTITION BY SYMBOL) ORDERS,   TTIME TTIME
FROM
  T1;

SYMBOL ORDERS TTIME

A           2   9300
A           2   9450
A           2  10300
A           2   9451
A           2  15300
A           2  17000
A           2  16000
B           4  16000
B           4   9300
C           3  16000

You stated that if TTIME is between 9450 and 1530 (should it be 15300?), that it should take priority over other values of TTIME. The DECODE below determines if TTIME is between 9450 and 15300, if so it assigns a value of 10 to EXTRA_SORT, otherwise it assigns a value of 1 to EXTRA_SORT:
SELECT
  SYMBOL,
  MAX(ORDERS) OVER (PARTITION BY SYMBOL) ORDERS,   TTIME TTIME, DECODE(SIGN(TTIME-9449.999),1,DECODE(SIGN(TTIME-15300.0001),-1,10,1),1) EXTRA_SORT
FROM
  T1;

SYMBOL ORDERS TTIME EXTRA_SORT

A           2   9300           1
A           2   9450          10
A           2  10300          10
A           2   9451          10
A           2  15300          10
A           2  17000           1
A           2  16000           1
B           4  16000           1
B           4   9300           1
C           3  16000           1

If we slide the above into an inline view, we can then rank the rows when sorted first on EXTRA_SORT and then on TTIME: SELECT
  SYMBOL,
  ORDERS,
  TTIME,
  RANK() OVER (PARTITION BY SYMBOL ORDER BY EXTRA_SORT DESC,TTIME) POSITION
FROM
  (SELECT
    SYMBOL,
    MAX(ORDERS) OVER (PARTITION BY SYMBOL) ORDERS,     TTIME TTIME, DECODE(SIGN(TTIME-9449.999),1,DECODE(SIGN(TTIME-15300.0001),-1,10,1),1) EXTRA_SORT
  FROM
    T1);

SYMBOL ORDERS TTIME POSITION

A           2   9450         1
A           2   9451         2
A           2  10300         3
A           2  15300         4
A           2   9300         5
A           2  16000         6
A           2  17000         7
B           4   9300         1
B           4  16000         2
C           3  16000         1

We can again slide the above into an inline view and extract only those with a POSITION value of 1:
SELECT
  SYMBOL,
  ORDERS,
  TTIME
FROM
  (SELECT
    SYMBOL,
    ORDERS,
    TTIME,
    RANK() OVER (PARTITION BY SYMBOL ORDER BY EXTRA_SORT DESC,TTIME) POSITION
  FROM
    (SELECT

      SYMBOL,
      MAX(ORDERS) OVER (PARTITION BY SYMBOL) ORDERS,
      TTIME TTIME,

DECODE(SIGN(TTIME-9449.999),1,DECODE(SIGN(TTIME-15300.0001),-1,10,1),1) EXTRA_SORT
    FROM
      T1)
  )
WHERE
  POSITION=1; SYMBOL ORDERS TTIME

A           2   9450
B           4   9300
C           3  16000

Charles Hooper
PC Support Specialist
K&M Machine-Fabricating, Inc. Received on Tue Jan 16 2007 - 13:08:14 CST