Oracle date function help

Hi all,
I need to write a function below scenario
I need to pass two parameters from_date and to_date
i want to get all dates between from_date and to_date except Saturdays and include from_date and to_date also.
Please help me.
Thanks,
Edited by: carmac on Jan 29, 2013 5:04 PM

Check in plain SQL.. Enter the dates inthe format YYYYMMDD
WITH t AS
        (SELECT TO_DATE (:dt1, 'YYYYMMDD') startdt,
                TO_DATE (:dt2, 'YYYYMMDD') enddt
           FROM DUAL)
SELECT *
FROM (    SELECT DECODE (TO_CHAR (startdt + ROWNUM, 'DY'),
                           'SAT', NULL,
                           startdt + ROWNUM)
                      dt
              FROM t
        CONNECT BY ROWNUM <= (enddt - startdt))
WHERE dt IS NOT NULL;PL/SQL approach (Function):---
CREATE TYPE t_dt AS OBJECT
       (dt DATE);
CREATE TYPE t_dt_tbl IS TABLE OF t_dt;
CREATE OR REPLACE FUNCTION fn_ret_dts_no_sat (p_dt1 varchar2, p_dt2 varchar2)
   RETURN t_dt_tbl
   PIPELINED AS
BEGIN
   FOR rec
      IN (WITH t AS
                  (SELECT TO_DATE (p_dt1, 'YYYYMMDD') startdt,
                          TO_DATE (p_dt2, 'YYYYMMDD') enddt
                     FROM DUAL)
          SELECT *
            FROM (    SELECT DECODE (TO_CHAR (startdt + ROWNUM, 'DY'),
                                     'SAT', NULL,
                                     startdt + ROWNUM)
                                dt
                        FROM t
                  CONNECT BY ROWNUM <= (enddt - startdt))
           WHERE dt IS NOT NULL) LOOP
      PIPE ROW (t_dt (rec.dt));
   END LOOP;
   RETURN;
END;
/Testing:
select * from table(fn_ret_dts_no_sat('20120101','20120131'));Output:
DT
1/2/2012
1/3/2012
1/4/2012
1/5/2012
1/6/2012
1/8/2012
1/9/2012
1/10/2012
1/11/2012
1/12/2012
1/13/2012
1/15/2012
1/16/2012
1/17/2012
1/18/2012
1/19/2012
1/20/2012
1/22/2012
1/23/2012
1/24/2012
1/25/2012
1/26/2012
1/27/2012
1/29/2012
1/30/2012
1/31/2012Cheers,
Manik.
Edited by: Included Function approach.

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Oracle Data Mining - How to use PREDICTION function with a regression model

I've been searching this site for Data Mining Q&A specifically related to prediction function and I wasn't able to find something useful on this topic. So I hope that posting it as a new thread will get useful answers for a beginner in oracle data mining.
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PURCHASE_WEEK DATE,
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SALES NUMBER
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(TO_DATE('12/11/2010 23:59:59', 'MM/DD/YYYY HH24:MI:SS'), 3, 77248);
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(PURCHASE_WEEK, WEEK, SALES)
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(TO_DATE('12/18/2010 23:59:59', 'MM/DD/YYYY HH24:MI:SS'), 4, 106624);
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(PURCHASE_WEEK, WEEK, SALES)
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(TO_DATE('12/25/2010 23:59:59', 'MM/DD/YYYY HH24:MI:SS'), 5, 104448);
Insert into T_SALES
(PURCHASE_WEEK, WEEK, SALES)
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(TO_DATE('01/01/2011 23:59:59', 'MM/DD/YYYY HH24:MI:SS'), 6, 90304);
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(PURCHASE_WEEK, WEEK, SALES)
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(TO_DATE('01/08/2011 23:59:59', 'MM/DD/YYYY HH24:MI:SS'), 7, 44608);
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(PURCHASE_WEEK, WEEK, SALES)
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(TO_DATE('01/15/2011 23:59:59', 'MM/DD/YYYY HH24:MI:SS'), 8, 95744);
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(PURCHASE_WEEK, WEEK, SALES)
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(TO_DATE('01/22/2011 23:59:59', 'MM/DD/YYYY HH24:MI:SS'), 9, 129472);
Insert into T_SALES
(PURCHASE_WEEK, WEEK, SALES)
Values
(TO_DATE('01/29/2011 23:59:59', 'MM/DD/YYYY HH24:MI:SS'), 10, 110976);
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(PURCHASE_WEEK, WEEK, SALES)
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(TO_DATE('02/05/2011 23:59:59', 'MM/DD/YYYY HH24:MI:SS'), 11, 139264);
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(PURCHASE_WEEK, WEEK, SALES)
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(TO_DATE('02/12/2011 23:59:59', 'MM/DD/YYYY HH24:MI:SS'), 12, 87040);
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(PURCHASE_WEEK, WEEK, SALES)
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(TO_DATE('02/19/2011 23:59:59', 'MM/DD/YYYY HH24:MI:SS'), 13, 47872);
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(PURCHASE_WEEK, WEEK, SALES)
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(TO_DATE('02/26/2011 23:59:59', 'MM/DD/YYYY HH24:MI:SS'), 14, 120768);
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(PURCHASE_WEEK, WEEK, SALES)
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(TO_DATE('03/05/2011 23:59:59', 'MM/DD/YYYY HH24:MI:SS'), 15, 98463.65);
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(PURCHASE_WEEK, WEEK, SALES)
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(PURCHASE_WEEK, WEEK, SALES)
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Therefore I'll have to go through few steps:
i) normalization of data
CREATE OR REPLACE VIEW t_sales_norm AS
SELECT week,
sales,
(sales - 91423.95)/27238.3693126778 sales_norm
FROM t_sales;
whereas the numerical values are the mean and the standard deviation:
select avg(sales) from t_sales;
91423.95
select stddev(sales) from t_sales;
27238.3693126778
ii) auto-correlation. For the sake of simplicity, I will safely assume that there is no auto-correlation (no repetitive pattern in sales among the weeks). Therefore to define the lag data I will consider the whole set:
CREATE OR REPLACE VIEW t_sales_lag AS
SELECT a.*
FROM (SELECT week,
sales,
LAG(sales_norm, 1) OVER (ORDER BY week) L1,
LAG(sales_norm, 2) OVER (ORDER BY week) L2,
LAG(sales_norm, 3) OVER (ORDER BY week) L3,
LAG(sales_norm, 4) OVER (ORDER BY week) L4,
LAG(sales_norm, 5) OVER (ORDER BY week) L5,
LAG(sales_norm, 6) OVER (ORDER BY week) L6,
LAG(sales_norm, 7) OVER (ORDER BY week) L7,
LAG(sales_norm, 8) OVER (ORDER BY week) L8,
LAG(sales_norm, 9) OVER (ORDER BY week) L9,
LAG(sales_norm, 10) OVER (ORDER BY week) L10,
LAG(sales_norm, 11) OVER (ORDER BY week) L11,
LAG(sales_norm, 12) OVER (ORDER BY week) L12,
LAG(sales_norm, 13) OVER (ORDER BY week) L13,
LAG(sales_norm, 14) OVER (ORDER BY week) L14,
LAG(sales_norm, 15) OVER (ORDER BY week) L15,
LAG(sales_norm, 16) OVER (ORDER BY week) L16,
LAG(sales_norm, 17) OVER (ORDER BY week) L17
FROM t_sales_norm) a;
iii) choosing the training data. Again, I will choose the whole set of 17 weeks, as for this discussion in not relevant how big should be the set of training data.
CREATE OR REPLACE VIEW t_sales_train AS
SELECT week, sales,
L1, L2, L3, L4, L5, L6, L7, L8, L9, L10,
L11, L12, L13, L14, L15, L16, L17
FROM t_sales_lag a
WHERE week >= 1 AND week <= 17;
iv) build the model
-- exec SYS.DBMS_DATA_MINING.DROP_MODEL('t_SVM');
BEGIN
sys.DBMS_DATA_MINING.CREATE_MODEL( model_name => 't_SVM',
mining_function => dbms_data_mining.regression,
data_table_name => 't_sales_train',
case_id_column_name => 'week',
target_column_name => 'sales');
END;
v) finally, where I am confused is applying the prediction function against this model and making sense of the results.
On a search on Google I found 2 ways of applying this function to my case.
One way is the following:
SELECT week, sales,
PREDICTION(t_SVM USING
LAG(sales,1) OVER (ORDER BY week) as l1,
LAG(sales,2) OVER (ORDER BY week) as l2,
LAG(sales,3) OVER (ORDER BY week) as l3,
LAG(sales,4) OVER (ORDER BY week) as l4,
LAG(sales,5) OVER (ORDER BY week) as l5,
LAG(sales,6) OVER (ORDER BY week) as l6,
LAG(sales,7) OVER (ORDER BY week) as l7,
LAG(sales,8) OVER (ORDER BY week) as l8,
LAG(sales,9) OVER (ORDER BY week) as l9,
LAG(sales,10) OVER (ORDER BY week) as l10,
LAG(sales,11) OVER (ORDER BY week) as l11,
LAG(sales,12) OVER (ORDER BY week) as l12,
LAG(sales,13) OVER (ORDER BY week) as l13,
LAG(sales,14) OVER (ORDER BY week) as l14,
LAG(sales,15) OVER (ORDER BY week) as l15,
LAG(sales,16) OVER (ORDER BY week) as l16,
LAG(sales,17) OVER (ORDER BY week) as l17
) pred
FROM t_sales a;
WEEK, SALES, PREDICTION
1, 55488, 68861.084076412
2, 78336, 104816.995823913
3, 77248, 104816.995823913
4, 106624, 104816.995823913
As you can see for the first row there is a value of 68861.084 and for the rest of 16 values is always one and the same 104816.995.
Question: where is my week 18 prediction ? or maybe I should say which one is it ?
Another way of using prediction even more confusing is against the lag table:
SELECT week, sales,
PREDICTION(t_svm USING a.*) pred
FROM t_sales_lag a;
WEEK, SALES, PREDICTION
1, 55488, 68861.084076412
2, 78336, 75512.3642096908
3, 77248, 85711.5003385927
4, 106624, 98160.5009687461
Each row out of 17, its own 'prediction' result.
Same question: which one is my week 18th prediction ?
Thank you very much for all help that you can provide on this matter.
It is as always highly appreciated.
Serge F.

Kindly let me know how to give input to predict the values for example script to create model is as follows
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select class, attribute_name, attribute_value, coefficient
from table(dbms_data_mining.get_model_details_svm('MODEL_SVMR1')) a, table(a.attribute_set) b
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-- to get predicted values (Q1)
SELECT PREDICTION(MODEL_SVMR1 USING *
) pred
FROM data_4svm a;
Here i am not sure how to predict B values . Please suggest the proper usage . Moreover In GUI (.NET windows form ) how user can give input and system can respond using the Q1

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for using R, I only can use Oracle data mining algorithms or I can use R function like social network in Oracle data base?

Oracle Advanced Analytics provides multiple language (SQL, R and if we include GUIs, Oracle Data Miner workflow UI) support to the in-DB analytics. Using SQL, R or the ODM'r GUI, you can access a library of simple descriptive, summary and coparative statistics that have been implemented in the Oracle Database + a dozen hi-perf in-DB data mining algorithms (e.g. regression, decision trees, text mining, clustering, associations, anomaly detection, etc.) and solve a wide range of business and technical problems.
Should you require additional techniques e.g. R CRAN packages, then Oracle Advanced Analytics supports that through R to SQL transparancy where it "pushes down" R language intentions to matching in-DB SQL functions e.g. ETL, stats and data mining OR it can make a callout to R via "embedded R mode" and have the Database manage the flow of data and the process.
There is an OTN Discussion Forum that focuses entirely on the "R" aspects of the Oracle Advanced Analytics Option. I suggest that you re-post your questiion here R Technologies for additional discusssions and for the benefit of that Oracle Advanced Analytics/Oracle R Enterprise OTN forum/community.
cb

Raw to date function in oracle

Hi..
I would like to know the details and usage of Raw to date function in oracle database.Could some one let me know the function details?

Connected to:
Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> set serveroutput on
SQL> DECLARE
2   rv RAW(32) := '786B060818023A';
3   dt DATE := NULL;
4 BEGIN
5    dbms_stats.convert_raw_value(rv, dt);
6    dbms_output.put_line(TO_CHAR(dt, 'DD-MON-YYYY'));
7 END;
8 /
08-JUN-2007
PL/SQL procedure successfully completed.
SQL>Regards,
Jo
PS: This is not my own example. I don't recollect the link I got this example from. Will post the link if I come across it again. I think its www.psoug.org (not sure)

Hi! pls help date functions

hi! i have problem in date functions in java!
1. if i give input date format is dd/mm/yyyyy (or) yyyy/mm/dd (or) mm/dd/yyyy?
the result must be display dd/mm/yyyy only?
pls help me!
thanks and regadrs
senthilraj

http://www.javaalmanac.com/egs/java.text/FormatDate.html
http://www.javaalmanac.com/egs/java.text/ParseDate.html

Oracle date function help

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