Get the closest previous date you

First, example table and data:
drop table CUSTOMER_INFO_TEST;

CREATE TABLE CUSTOMER_INFO_TEST
(
ACCOUNT_NUM VARCHAR2 (40 BYTE),
PHONE VARCHAR2 (100 BYTE),
E-MAIL VARCHAR2 (300 BYTE),
DATE OF START_DT,
DATE OF CHANGE_DT,
END_DT DATE
);

INSERT INTO CUSTOMER_INFO_TEST VALUES ('BOB', 555-1234', ", TO_DATE ('2011-01-01', 'YYYY-MM-DD'), TO_DATE ('2011-01-05', 'YYYY-MM-DD'), TO_DATE ('2011-01-10', 'YYYY-MM-DD'));
INSERT INTO CUSTOMER_INFO_TEST VALUES ('BOB', 555-1234', ", TO_DATE ('2011-01-01', 'YYYY-MM-DD'), TO_DATE ('2011-01-11', 'YYYY-MM-DD'), NULL);
INSERT INTO CUSTOMER_INFO_TEST VALUES ('BOB', 555-1234', ", TO_DATE ('2011-01-01', 'YYYY-MM-DD'), TO_DATE ('2011-01-15', 'YYYY-MM-DD'), NULL);
INSERT INTO CUSTOMER_INFO_TEST VALUES ('JACK', 555-4321', ", TO_DATE ('2011-01-01', 'YYYY-MM-DD'), TO_DATE ('2011-01-05', 'YYYY-MM-DD'), NULL);
INSERT INTO CUSTOMER_INFO_TEST VALUES ('JACK', 555-4321', ", TO_DATE ('2011-01-01', 'YYYY-MM-DD'), TO_DATE ('2011-01-09', 'YYYY-MM-DD'), NULL);

commit;

I want to query this table with a date range, change_dt, always to give me the lines in the range AND the previous row.

select * from CUSTOMER_INFO_TEST where change_dt >= TO_DATE('2011-01-05', 'YYYY-MM-DD') and change_dt <= TO_DATE('2011-01-10', 'YYYY-MM-DD')

BOB     555-1234          2011-01-01     2011-01-05     2011-01-10
JACK     555-4321          2011-01-01     2011-01-05     
JACK     555-4321          2011-01-01     2011-01-09

The foregoing will give me the correct result, a BOB and two jacks, since also while JACK and BOB changes the 5 January.

But I want the same result, when you select it with 6 Jan as start date,

This is how I can make it explicit for BOB

select * from CUSTOMER_INFO_TEST where 
change_dt >= (select max(change_dt ) from CUSTOMER_INFO_TEST where change_dt <= to_date('2011-01-06','YYYY-MM-DD') and ACCOUNT_NUM = 'BOB')
and change_dt <= to_date('2011-01-06','YYYY-MM-DD')
and ACCOUNT_NUM = 'BOB'

BOB     555-1234          2011-01-01     2011-01-05     2011-01-10

Is this possible without a sub request, and in a statement across the table without specifying the actual table data, as I did with "BOB" in the above statement?

Edited by: Rydman January 14, 2013 14:39

Hello

I think I understand now: you have 2 parameters, range_start_dt and range_end_dt, and you want to find the rows where the change_dt is between these parameters, PLUS you want the last row for each account_number coming before the interval given, if the same customer has lines in the range.

Here's a way to do it:

VARIABLE  range_start_dt     VARCHAR2 (10)
VARIABLE  range_end_dt          VARCHAR2 (10)
EXEC      :range_start_dt := '2011-01-06';
EXEC      :range_end_dt   := '2011-01-10';

WITH     got_r_num     AS
(
     SELECT     account_num, phone, email, start_dt, change_dt, end_dt
     ,     RANK ()       OVER ( PARTITION BY  account_num
                               ,                    SIGN (start_dt - TO_DATE ( :range_start_dt
                                                             , 'YYYY-MM-DD'
                                                 )
                                   )
                         ORDER BY        start_dt   DESC
                       )         AS r_num
     FROM     customer_info_test
     WHERE     change_dt     < TO_DATE ( :range_end_dt
                             , 'YYYY-MM-DD'
                           ) + 1   -- See note below
)
SELECT       account_num, phone, email, start_dt, change_dt, end_dt
FROM       got_r_num
WHERE       change_dt     >= TO_DATE ( :range_start_dt
                            , 'YYYY-MM-DD'
                       )
OR       r_num          = 1
;

Range_end_dt indicates just the calendar day of the end of the range; in other words: range_end_dt = ' 2011-01-10' means anything at any time, January 10, 2011, until 23:59:59, must be included. Instead of saying you want everything up to and including 23:59:59 on January 10, I find it easier just to say you want everything up to but not including the day after January 10.

If all change_dts for a given account_num after range_end_dt, then no output for this account_num will be generated.

Tags: Database

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