Overlapping Dates, tables Denormaization
Hi guys,.I'm in a situation that we are denormalize tables for better performance and reduce the joins. I joined the tables using the logic to check for dates and add the fields for these dates to represent the joined data correct at some point of time. A simple example is:
In the tables below: in Table1, 0023 a case_number is with "AC" status during the period 15 January 08 to 31-dec-9999 (date to be limited or current composition), and in Table2 the same case is to have center_code "C12" for 22 June 08 and 31-dec-9999. When the tables are joined too experienced dates will be common as data * 0023 has, June 22, 2008, 31-DEC-9999, AC, C12 *.
My [previous assignment | http://forums.oracle.com/forums/thread.jspa?forumID=75 & threadID = 682324] on the forums who answered by Frank and was perfectly working for me to get the results of different data as above mentioned thread, but the current set of data throw me the problem by not checking the overlapping Dates no
CREATE TABLE TABLE1 (
CASE_NUMBER VARCHAR2(5),
CHANGE_EFF_DATE DATE,
END_EFF_DATE DATE,
STATUS VARCHAR2(2) );
INSERT INTO TABLE1 VALUES
( '0023A'
,TO_DATE('15-JAN-2008','DD-MON-YYYY')
,TO_DATE('31-DEC-9999','DD-MON-YYYY')
,'AC'
);
INSERT INTO TABLE1 VALUES
( '0023A'
,TO_DATE('07-OCT-2007','DD-MON-YYYY')
,TO_DATE('14-JAN-2008','DD-MON-YYYY')
,'CL'
);
INSERT INTO TABLE1 VALUES
( '0023A'
,TO_DATE('08-APR-2007','DD-MON-YYYY')
,TO_DATE('06-OCT-2007','DD-MON-YYYY')
,'AC'
);
INSERT INTO TABLE1 VALUES
( '0023A'
,TO_DATE('13-MAR-2007','DD-MON-YYYY')
,TO_DATE('07-APR-2007','DD-MON-YYYY')
,'RJ'
);
INSERT INTO TABLE1 VALUES
( '0023A'
,TO_DATE('31-MAY-2005','DD-MON-YYYY')
,TO_DATE('12-MAR-2007','DD-MON-YYYY')
,'AP'
);
CREATE TABLE TABLE2 (
CASE_NUMBER VARCHAR2(5),
CHANGE_EFF_DATE DATE,
END_EFF_DATE DATE,
CENTER_CODE VARCHAR2(3) );
INSERT INTO TABLE2 VALUES
( '0023A'
,TO_DATE('22-JUN-2007','DD-MON-YYYY')
,TO_DATE('31-DEC-9999','DD-MON-YYYY')
,'C12'
);
INSERT INTO TABLE2 VALUES
( '0023A'
,TO_DATE('09-MAR-2007','DD-MON-YYYY')
,TO_DATE('21-JUN-2007','DD-MON-YYYY')
,'101'
);
SQL> SELECT * FROM TABLE1;
CASE_ CHANGE_EF END_EFF_D ST
--------------------------------------------------------
0023A 15-JAN-08 31-DEC-99 AC
0023A 07-OCT-07 14-JAN-08 CL
0023A 08-APR-07 06-OCT-07 AC
0023A 13-MAR-07 07-APR-07 RJ
0023A 31-MAY-05 12-MAR-07 AP
SQL> SELECT * FROM TABLE2;
CASE_ CHANGE_EF END_EFF_D CEN
--------------------------------------------------
0023A 22-JUN-07 31-DEC-99 C12
0023A 09-MAR-07 21-JUN-07 101
-----Here's the query I have spin for the attached information from the two tables with regard to the specific point in time.
SELECT T1.CASE_NUMBER
,GREATEST(T1.CHANGE_EFF_DATE,T2.CHANGE_EFF_DATE) CHANGE_EFF_DATE
,LEAST(T1.END_EFF_DATE,T2.END_EFF_DATE) END_EFF_DATE
,T1.STATUS
,T2.CENTER_CODE
FROM
TABLE1 T1
LEFT OUTER JOIN
TABLE2 T2
ON
T1.CASE_NUMBER=T2.CASE_NUMBER AND
T1.CHANGE_EFF_DATE <= T2.END_EFF_DATE AND
T2.CHANGE_EFF_DATE <= T1.END_EFF_DATE
ORDER BY 2;
Here is the result-set I am getting :
CASE_ CHANGE_EF END_EFF_D ST CEN
------------------------------------------------------
0023A 09-MAR-07 12-MAR-07 AP 101
0023A 13-MAR-07 07-APR-07 RJ 101
0023A 08-APR-07 21-JUN-07 AC 101
0023A 22-JUN-07 06-OCT-07 AC C12
0023A 07-OCT-07 14-JAN-08 CL C12
0023A 15-JAN-08 31-DEC-99 AC C12
My result set should include the overlap of dates as well which should look like this, but miss me the top (first record) in my output:CASE_ CHANGE_EF END_EFF_D ST CEN
-----------------------------------------------------
0023A 31-MAY-07 08-MAR-07 AP
0023A 09-MAR-07 12-MAR-07 AP 101
0023A 13-MAR-07 07-APR-07 RJ 101
0023A 08-APR-07 21-JUN-07 AC 101
0023A 22-JUN-07 06-OCT-07 AC C12
0023A 07-OCT-07 14-JAN-08 CL C12
0023A 15-JAN-08 31-DEC-99 AC C12
I'll be really grateful if you guys can me help me.Thank you.
Vlaminck
Published by: Oracle, developer on December 11, 2008 21:30
Hi, Vlaminck,
If I understand the problem, you need a line of table2 which covers all the dates before the first change_eff_date, similar to the way you see a line that covers all dates after the last change_eff_date. You don't have to store such a line in the table: you can generate a runtime and use the UNION to add it to your actual data.
WITH t2 AS
(
SELECT case_number
, change_eff_date
, end_eff_date
, center_code
FROM table2
UNION
SELECT case_number
, TO_DATE (1, 'J') AS change_eff_date -- Earliest possible date
, MIN (change_eff_date) - 1 AS end_eff_date
, NULL AS center_code
FROM table2
GROUP BY case_number
)
SELECT T1.CASE_NUMBER
, GREATEST (T1.CHANGE_EFF_DATE, T2.CHANGE_EFF_DATE) CHANGE_EFF_DATE
, LEAST (T1.END_EFF_DATE ,T2.END_EFF_DATE) END_EFF_DATE
, T1.STATUS
, T2.CENTER_CODE
FROM TABLE1 T1
LEFT OUTER JOIN T2
ON T1.CASE_NUMBER = T2.CASE_NUMBER
AND T1.CHANGE_EFF_DATE <= T2.END_EFF_DATE
AND T2.CHANGE_EFF_DATE <= T1.END_EFF_DATE
ORDER BY 1, 2;
Note that the main request is exactly what you had before, with the exception of the definition of t2.
Where t2 had simply table2, now it is the UNION of table2 with one line per case_number, with a change_eff_date in 4712 BCE.
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Hello. I want to play a game that requires a pentium 4 3.2 GHz or more powerful. I have an Intel (r) Core (TM) 2 Duo CPU T5550 1.83 GHz 1.83 GHz. Don't know much about computers and want to know I can play it until I open it. Thank you.
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reposition/do rotate the image on laptop
the pictureon my lab top, he went on the side he was up and down do not know what is happening my lab top picturewent side to side instead of up and down high laboratory anoter has been on top of the other to the my photo albums lab went horisonal in