Generate the block number

Hi Experts,

I'm provoding a couple examples of data

with t as
(
select 1 loan_id,'xxx' bn from dual
union all
select 2 loan_id,null borrower_name from dual
union all
select 3 loan_id,null borrower_name from dual
union all
select 7 loan_id,'ac' borrower_name from dual
union all
select 10 loan_id,'ac' borrower_name from dual
union all
select 11 loan_id,null borrower_name from dual
)
select loan_id,bn
from t
/

LOAN_ID BN
---------- ---
         1 xxx
         2 
         3 
         7 ac
        10 ac
        11

Desired O/p

loan_id   bn    group_no
1          xxx    G1
2                   G1
3                   G1
7         ac       G3
10       ac       G4
11                 G4

So, I try to generate the new column filled with a few unique group_no. A group has the value of loan_ids which are in order.

Ex: loan_ids 1,2,3 are regarded as a single group and 10,11 as another group.

And I made an attempt using lead and the delay of analytical functions.

SQL> with t as
  2  (
  3  select 1 loan_id,'xxx' bn from dual
  4  union all
  5  select 2 loan_id,null borrower_name from dual
  6  union all
  7  select 3 loan_id,null borrower_name from dual
  8  union all
  9  select 7 loan_id,'ac' borrower_name from dual
 10  union all
 11  select 10 loan_id,'ac' borrower_name from dual
 12  union all
 13  select 11 loan_id,null borrower_name from dual
 14  )
 15  select id,bn,(
 16                case when lg = id-1 or ld=id+1 then
 17                'G'
 18                else
 19                'N'
 20                end
 21                )group_no
 22  from
 23  (
 24  select loan_id id,bn,lag(loan_id) over(order by loan_id) lg,lead(loan_id) over(order by loan_id) ld
 25  from t
 26  )
 27  /

        ID BN  GROUP_NO
---------- --- --------
         1 xxx G
         2     G
         3     G
         7 ac  N
        10 ac  G
        11     G

6 rows selected

But its production group_no even for all groups. Experts please help.

Published by: RUSSO Sep 21, 2011 07:55

With tutorial method Tabibitosan by Aketi Jyuuzou

Method Tabibitosan by Aketi Jyuuzou tutorial

WITH t AS
     (SELECT 1 loan_id, 'xxx' bn
        FROM DUAL
      UNION ALL
      SELECT 2 loan_id, NULL borrower_name
        FROM DUAL
      UNION ALL
      SELECT 3 loan_id, NULL borrower_name
        FROM DUAL
      UNION ALL
      SELECT 7 loan_id, 'ac' borrower_name
        FROM DUAL
      UNION ALL
      SELECT 10 loan_id, 'ac' borrower_name
        FROM DUAL
      UNION ALL
      SELECT 11 loan_id, NULL borrower_name
        FROM DUAL)
select loan_id, bn, 'G'||dense_rank()over(order by makegroup) GRP_ID
from (
SELECT   loan_id, bn,
          loan_id - row_number () OVER (ORDER BY loan_id) AS makegroup
    FROM t)
ORDER BY loan_id;

   LOAN_ID BN  GRP_ID
---------- --- -----------------------------------------
         1 xxx G1
         2     G1
         3     G1
         7 ac  G2
        10 ac  G3
        11     G3                                       

6 rows selected.

Tags: Database

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dt date,
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HELEN wrote:

If you look at my CREATE TABLE, the ID column is a primary key and represents the order of the data in the file.

Done batch_no = 100 come before or after 101? Batch_no = 100 a ID so much until after the id for batch_no = 101.

Good point, but that won't happen because of the way the 'record' is generated. All batch_nos will be contiguous. So if batch_no 100 comes earlier in the file as 101, it should get some 2nd highest sequence number. Otherwise, lower. Basically, the 2nd part of the sequence must simialar logical number to the 3rd party (i.e. order by id) but that messes things. Still struggle with it. Any help appreciated.

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WITH got_min_ids AS

(

SELECT id, dt, file_no, batch_no, data

MIN (id) over (PARTITION BY dt

file_no

) AS min_id_file_no

MIN (id) over (PARTITION BY dt

file_no

batch_no

) AS min_id_batch_no

T

)

SELECT id, dt, file_no, batch_no, data

DENSE_RANK () OVER (PARTITION BY dt

ORDER BY min_id_file_no

)

|| '.'

|| DENSE_RANK () OVER (PARTITION BY dt

file_no

ORDER BY min_id_batch_no

)

|| '.'

|| ROW_NUMBER () OVER (PARTITION BY dt

file_no

batch_no

ORDER BY id

) AS seq

OF got_min_ids

ORDER BY dt, min_id_file_no, min_id_batch_no, id

;

The main request is in fact what I posted before, but instead of

"ORDER BY file_no" and "ORDER BY batch_no", she uses

"ORDER BY min_id_file_no" and "ORDER BY min_id_batch_no". These values are calculated in the subquery, got_min_ids.

Output (including the additional sample data I posted):

ID FILE_NO DT BATCH_NO SEQ DATA

---------- ----------- ---------- ---------- ----- ----------

1 23 25 April 2014 113 dXAad 1.1.1

2 345 23 25 April 2014 pumVG 1.2.1

3 345 23 25 April 2014 jLnbO 1.2.2

4 23 25 April 2014 543 xKhCL 1.3.1

5 23 25 April 2014 543 JQoWk 1.3.2

6 23 25 April 2014 543 YjJeC 1.3.3

7 24 25 April 2014 333 WjQNE 2.1.1

8 24 25 April 2014 333 ScWSL 2.1.2

9 24 25 April 2014 333 pXDSD 2.1.3

10 222 24 25 April 2014 OSajn 2.2.1

11 222 24 25 April 2014 QNpix 2.2.2

12 24 111 OwkjI 2.3.1 April 25, 2014

91 100 99 25 April 2014 sRWmT 3.1.1

93 100 99 25 April 2014 IAEFd 3.1.2

92 101 99 25 April odQxh 2014 3.2.1

I know you said that this situation is impossible (that is, if ID 91 and 93 have the same batch_no, then id 92 cannot have a different batch_no), but the application works even if this rule is broken.

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Published by: 934451 on 8 August 2012 06:33

Published by: 934451 on 8 August 2012 06:50
Hello

As a result of your previous thread: {: identifier of the thread = 2403469}

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;
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