Question

Selecting data from two consecutive rows.

Asked by: awking00

I have a table that is ordered by id and tax_period with the following structure:
 id varchar2
,tax_period date
,related_period date

My question is how can I select the related_period value from a given row and the related_period value of the subsequent (or previous) row simultaneously, when the id values are the same and the tax_period values are different by fewer than twelve months? I have been able to determine the values using a self join, but the table contains approximately 30 million rows and does not perform well. I appreciate any ideas.

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Asked On
2004-10-21 at 11:50:13ID21177722
Tags

consecutive

Topic

Oracle Database

Participating Experts
3
Points
500
Comments
5

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Answers

 

by: paquicubaPosted on 2004-10-21 at 12:02:01ID: 12373332

Can you post some sample data?

 

by: slightwvPosted on 2004-10-21 at 12:31:49ID: 12373646

Take a look at the lead and lag functions:

drop table tab1;
create table tab1(
      col1 varchar2(10)
);

insert into tab1 values('Hello');
insert into tab1 values('World');
commit;

select col1,lead(col1) over(order by col1) from tab1;
select col1,lag(col1) over(order by col1) from tab1;

 

by: jimaricatPosted on 2004-10-21 at 13:17:02ID: 12374152

i think lag function will do as said by slightwv

try this,.maybe u'r expected result will vary,..but u can use the concept.

select tax_period,related_period,previous_related_period from (
select tax_period,related_period,lag(related_period,1,related_period) over (order by tax_period) as previous_related_period,lag(tax_period,1,tax_period) over (order by tax_period) as previous_taxperiod from taxtable where id='id') where tax_period - previous_taxperiod < 365

hope the id column is indexed

 

by: awking00Posted on 2004-10-22 at 11:42:07ID: 12383812

Thanks so much for pointing me to the lead/lag function. It was precisely what was needed. The self join process took hours and using the lead function took less than 10 minutes. Much appreciated.

 

by: slightwvPosted on 2004-10-22 at 12:29:48ID: 12384310

How about awarding the points now............

20120131-EE-VQP-002

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