Trying to get ending entry into force for the groups of lines

Hello world

I searched the forums, but I can't find a post that is a problem quite like that.

I have some data that looks like this:
        ID_NUM     EFFECTIVE ALLOC_PERCENT   ACCT
---------- --------- -------------   ----
       101 01-JUL-11            21   A1
       101 01-JUL-11            72   A2
       101 01-JUL-11             7   A3

       101 01-JUL-12            20   B1
       101 01-JUL-12            80   B2

       101 01-JAN-13            20   A1
       101 01-JAN-13            20   A2
       101 01-JAN-13            50   A3
       101 01-JAN-13            10   B1

       101 01-JUN-13            50   A1
       101 01-JUN-13            50   A2
(note: I inserted manually empty lines for clarity)

Here's the logic: the lines represent an assignment of percentage on the account for the identification number specified for this entry into force. A new date to cancel the previous, and if any line in the conceptual group is replaced, so they are all.

I'll try to find the date when the effective period of each group ended and which includes in the game so that I can calculate then the number of days in a given line has been effective; something like that;
  ID_NUM     EFFECTIVE END_DATE   ALLOC_PERCENT ACCT
---------- --------- ---------- ------------- ----
       101 01-JUL-11 01-JUL-12             21 A1
       101 01-JUL-11 01-JUL-12             72 A2
       101 01-JUL-11 01-JUL-12              7 A3

       101 01-JUL-12 01-JAN-13             20 B1
       101 01-JUL-12 01-JAN-13             80 B2

       101 01-JAN-13 01-JUN-13             20 A1
       101 01-JAN-13 01-JUN-13             20 A2
       101 01-JAN-13 01-JUN-13             50 A3
       101 01-JAN-13 01-JUN-13             10 B1

       101 01-JUN-13 <null>                50 A1
       101 01-JUN-13 <null>                50 A2
The end_date of the group is the EFFECTIVE_DATE of the next group (ordered by ID_NUM, EFFECTIVE_DATE).

End_date of two rows is zero because there is no group of lines with an effective date the later - in my process, I'll NVL which sysdate so that my calculations of days will be valid.

I tried some analytical queries with LEAD, but I couldn't figure out how to get the next date of the efficient group. I could get the entry into force of the next row, but not the next group. I couldn't specify how many lead lines to look forward, because there is not a number of rows in each group.

How to fill the end_date column?

Here's the code to create the above.
create table t
(id_num number,
 effective_date date,
 alloc_percent number,
 acct_code varchar2(4)
 );

insert into t (id_num,Effective_date,alloc_percent,acct_code) values(101,'01-jul-2011',21.0,'A1');
insert into t (id_num,Effective_date,alloc_percent,acct_code) values(101,'01-jul-2011',72.0,'A2'); 
insert into t (id_num,Effective_date,alloc_percent,acct_code) values(101,'01-jul-2011',7.0,'A3');
insert into t (id_num,Effective_date,alloc_percent,acct_code) values(101,'01-jul-2012',20.0,'B1');
insert into t (id_num,Effective_date,alloc_percent,acct_code) values(101,'01-jul-2012',80.0,'B2');
insert into t (id_num,Effective_date,alloc_percent,acct_code) values(101,'01-jan-2013',20.0,'A1');
insert into t (id_num,Effective_date,alloc_percent,acct_code) values(101,'01-jan-2013',20.0,'A2');
insert into t (id_num,Effective_date,alloc_percent,acct_code) values(101,'01-jan-2013',50.0,'A3');
insert into t (id_num,Effective_date,alloc_percent,acct_code) values(101,'01-jan-2013',10.0,'B1');
insert into t (id_num,Effective_date,alloc_percent,acct_code) values(101,'01-jun-2013',50.0,'A1');
insert into t (id_num,Effective_date,alloc_percent,acct_code) values(101,'01-jun-2013',50.0,'A2');

commit;

select * from t;
Oracle version information:
Oracle Database 11 g Enterprise Edition Release 11.2.0.3.0 - 64 bit Production
PL/SQL Release 11.2.0.3.0 - Production
"CORE 11.2.0.3.0 Production."
AMT for Solaris: 11.2.0.3.0 - Production Version
NLSRTL Version 11.2.0.3.0 - Production


Thank you very much

Hello

Here is one more way to do using lead work.

WITH ds as (id_num, effective_Date, lead (effective_date) select on end_date (id_num order, effective_Date))

t

Id_num group, effective_date)

Select t.*, ds.end_date

DS, t

where t.effective_Date = ds.effective_Date;

Tags: Database

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