Query to get the last change in the particular column

Hello

[Update]
I need help to find the last change to a particular to a table column.

tell the table as
t_address (phone_number, first_name, user_id, change_date)

I need to find what was her last phone number change happened.
Well, the date of change is updated for any changes in this table. I want to understand the change_date only when a particular field has changed (from the previous value). It seems a little complicated for me.

t_address (phone_number, first_name, user_id, change_date)

say for any change of phone_number, name it will be an entry in this table t_address. and change_date will be the inserted date.

say

USR_ID phone_number name change_date
Hari 123 Henderson 12/12/2011
Hari hari 123 12/11/2011
Hari hari 345 12/10/2011

now my requirement is to get 12/11/2011 as on that particular date, the phone number has changed from previous value.


Please suggest.

Published by: user7807429 on Sep 10, 2012 11:51

Hello

WITH t_address AS (
SELECT 'hari' usr_id, 123 phone_number, 'harinath' first_name ,DATE '2011-12-12' change_date FROM dual UNION ALL
SELECT 'hari' usr_id, 123 phone_number, 'hari' first_name ,DATE '2011-12-11' change_date FROM dual UNION ALL
SELECT 'hari' usr_id, 345 phone_number, 'hari' first_name ,DATE '2011-12-10' change_date FROM dual
)
SELECT  usr_id
       ,phone_number
       ,prev_phone_number
       ,first_name
       ,change_date
FROM    (
    -- Select only the rows where the phone number changed
    -- and max phone change date for each user
    SELECT  usr_id
           ,phone_number
           ,first_name
           ,change_date
           ,prev_phone_number
           ,MAX(change_date)
            OVER (PARTITION BY usr_id
                  ORDER BY change_date
                  RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING
                  ) max_change_date
    FROM    (
        -- Select the data together with the phone number of the previous row
        SELECT  usr_id
               ,phone_number
               ,first_name
               ,change_date
               ,LAG(phone_number)
                OVER (PARTITION BY usr_id
                      ORDER BY change_date
                      ) prev_phone_number
        FROM    t_address
        )
    -- check for difference with decode because phone_number might be NULL
    WHERE   DECODE( prev_phone_number, phone_number, 1, 0 ) = 0
    )
WHERE   change_date = max_change_date;

USR_ID PHONE_NUMBER PREV_PHONE_NUMBER FIRST_NAME CHANGE_DATE
------ ------------ ----------------- ---------- -----------
hari            123               345 hari       11.12.2011

You can include the current value if you join more intimate in the select t_user.

Concerning
Marcus

Tags: Database

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