How to calculate the difference in lines
Hi, the case is:
Column1 Column2 Column3 column4
C114 00301152 20/07/2010?
C114 00301152 10/20/2009?
C114 00301152 16/06/2009?
I want to calculate the difference of Column3 in 1st place with the second row and second row to the third row column4 unlike
Thank you very much
Luca
Hi, Luca,
user12880276 wrote:
Hi, the case is:
Column1 Column2 Column3 column4
C114 00301152 20/07/2010?
C114 00301152 10/20/2009?
C114 00301152 16/06/2009?
I want to calculate the difference of Column3 in 1st place with the second row and second row to the third row column4 unlike
Thank you very much
Luca
You can use the analytical function of LAG (or LEAD).
For example, if Column3 is a DATE:
SELECT column1, Column2, Column3
, Column3 - (Column3) in ADVANCE ON (ORDER BY Column3) AS days_diff
FROM table_x
ORDER BY DESC - optionally Column3
;
If you would care to post CREATE TABLE and INSERT instructions for the sample data, and then I could test this.
Check out the Forum FAQ: Re: 2. How can I ask a question on the forums?
Column1 and column2 play no role in this problem (except that appear in the output)? If so, you will need to PARTITION BY in the analytical clause.
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any help will be greatly appreciated.Wuzhishan,
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