understand row_number() and its use in analytic function

Hello all;

I've been playing with row_number and trying to figure out how to use it, and yet I still can't understand...

I have the following code below
create table Employee(
    ID                 VARCHAR2(4 BYTE)         NOT NULL,
   First_Name         VARCHAR2(10 BYTE),
   Last_Name          VARCHAR2(10 BYTE),
    Start_Date         DATE,
    End_Date           DATE,
     Salary             Number(8,2),
   City               VARCHAR2(10 BYTE),
    Description        VARCHAR2(15 BYTE)
 )
 

insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
             values ('01','Jason',    'Martin',  to_date('19960725','YYYYMMDD'), to_date('20060725','YYYYMMDD'), 1234.56, 'Toronto',  'Programmer');




insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
              values('02','Alison',   'Mathews', to_date('19760321','YYYYMMDD'), to_date('19860221','YYYYMMDD'), 6661.78, 'Vancouver','Tester')




 insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
             values('03','James',    'Smith',   to_date('19781212','YYYYMMDD'), to_date('19900315','YYYYMMDD'), 6544.78, 'Vancouver','Tester')




insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
              values('04','Celia',    'Rice',    to_date('19821024','YYYYMMDD'), to_date('19990421','YYYYMMDD'), 2344.78, 'Vancouver','Manager')




insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
              values('05','Robert',   'Black',   to_date('19840115','YYYYMMDD'), to_date('19980808','YYYYMMDD'), 2334.78, 'Vancouver','Tester')




 insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)
              values('06','Linda',    'Green',   to_date('19870730','YYYYMMDD'), to_date('19960104','YYYYMMDD'), 4322.78,'New York',  'Tester')




insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)
              values('07','David',    'Larry',   to_date('19901231','YYYYMMDD'), to_date('19980212','YYYYMMDD'), 7897.78,'New York',  'Manager')




insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)
               values('08','James',    'Cat',     to_date('19960917','YYYYMMDD'), to_date('20020415','YYYYMMDD'), 1232.78,'Vancouver', 'Tester')
I made a simple select statement

Select * from employee

and it returns it below
ID   FIRST_NAME LAST_NAME  START_DAT END_DATE      SALARY CITY       DESCRIPTION
---- ---------- ---------- --------- --------- ---------- ---------- ---------------
01   Jason      Martin     25-JUL-96 25-JUL-06    1234.56 Toronto    Programmer
02   Alison     Mathews    21-MAR-76 21-FEB-86    6661.78 Vancouver  Tester
03   James      Smith      12-DEC-78 15-MAR-90    6544.78 Vancouver  Tester
04   Celia      Rice       24-OCT-82 21-APR-99    2344.78 Vancouver  Manager
05   Robert     Black      15-JAN-84 08-AUG-98    2334.78 Vancouver  Tester
06   Linda      Green      30-JUL-87 04-JAN-96    4322.78 New York   Tester
07   David      Larry      31-DEC-90 12-FEB-98    7897.78 New York   Manager
08   James      Cat        17-SEP-96 15-APR-02    1232.78 Vancouver  Tester
I wrote another select statement with row_number. See below
SELECT first_name, last_name, salary, city, description, id,
   ROW_NUMBER() OVER(PARTITION BY description ORDER BY city desc) "Test#"
   FROM employee
   
and I get this result
First_name  last_name   Salary         City             Description         ID         Test#
Celina          Rice         2344.78      Vancouver    Manager             04          1
David          Larry         7897.78      New York    Manager             07          2
Jason          Martin       1234.56      Toronto      Programmer        01          1
Alison         Mathews    6661.78      Vancouver   Tester               02          1  
James         Cat           1232.78      Vancouver    Tester              08          2
Robert        Black         2334.78     Vancouver     Tester              05          3
James        Smith         6544.78     Vancouver     Tester              03          4
Linda         Green        4322.78      New York      Tester             06           5
I understand the partition by which means basically for each associated group a unique number wiill be assigned for that row, so in this case since tester is one group, manager is another group, and programmer is another group then tester gets its own unique number for each row, manager as well and etc.
What is throwing me, that's the order of and how these numbers are assigned. Why is

1 assigned to Alison Mathews for the tester group and 2 assigned to James Cat and assigned 3 Robert Black

I apologize if this is a stupid question, I tried to read about this online and looking at the oracle documentation, but still do not understand why.

user13328581 wrote:
What is throwing me, that's the order of and how these numbers are assigned. Why is

1 assigned to Alison Mathews for the tester group and 2 assigned to James Cat and assigned 3 Robert Black

Description (partition by column) and city (control column) values are same for Alison, James and Robert, no sort order of these 3 records be held valid.
Oracle just happened to choose a. What do you think should be the numbering "correct"?

Tags: Database

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    Hi all...

    This should be a quick. I hope I can solve my problem with an analytic function, but I don't know if it's possible. Can I use a subquery if I have to, but I'd really rather not.

    Here is a very simple version of what I'm trying to do:
    CREATE TABLE     test123
    (     field1          VARCHAR2(10)
    ,     field2          VARCHAR2(10)
    ,     my_date          DATE
    );
    
    INSERT INTO     test123
    VALUES     ('value1', 'a',TO_DATE('12/31/1900','mm/dd/yyyy'));
    INSERT INTO     test123
    VALUES     ('value1', 'b',TO_DATE('01/02/2010','mm/dd/yyyy'));
    INSERT INTO     test123
    VALUES     ('value1', 'c',TO_DATE('01/05/2010','mm/dd/yyyy'));
    
    INSERT INTO     test123
    VALUES     ('value2', 'a',TO_DATE('12/31/1900','mm/dd/yyyy'));
    INSERT INTO     test123
    VALUES     ('value2', 'b',TO_DATE('01/01/2010','mm/dd/yyyy'));
    INSERT INTO     test123
    VALUES     ('value2', 'c',TO_DATE('01/15/2010','mm/dd/yyyy'));
    I want the results:
    FIELD1     FIELD2
    --------------
    value2     a
    value2     b
    value2     c
    value1     a
    value1     b
    value1     c
    I started with the following query:
    SELECT     field1
    ,          field2
    FROM     test123
    ORDER BY     MIN(my_date)     OVER     (
                                                 PARTITION BY     field1
                                                 )                                -- removed DESC here
    ,               field2
    But the problem is the database has a date of 31 December 1900 ' as default / initial for any date field. I don't want these default values taken into account in my calculation of min. I tried to put a WHERE clause in my analytical function [WHERE my_date <>TO_DATE (' 12/31/1900 ',' mm/dd/yyyy')], but I kept getting an error message "missing right parenthesis", so it seems that you can not have a WHERE clause here... or I'm just something wrong?

    Moreover, it is a 8i database...

    Edited by: user11033437 may 20, 2010 17:16: took the 'DESC' criteria out of my order by clause. In my real application, I need DESC, but not the example.

    Hello

    A WHERE clause excludes rows in the results set. Whenever you want you can have a WHERE clause that was more limited (for example, something that would simply exclude MIN calculating values in the ORDER BY clause), then think CASE:

    SELECT       field1
    ,       field2
    FROM       test123
    ORDER BY  MIN ( CASE
                  WHEN  my_date > TO_DATE ( '12/31/1900'
                                 , 'MM/DD/YYYY'
                                 )
                  THEN  my_date
              END
               )     OVER     (PARTITION BY     field1)      DESC
    ,       field2
    ;
    

    This puts the lines for "Value1" first.
    The minimum my_date for "Value1" (after excluding the values of 1900) is later than the minimum for "Value2", so I think that you either made a mistake in the desired output, or you do not want sorted by descending order.

    As always, thanks for the display of the data of the sample and the results so clearly.

  • Using the analytical function.

    Hello

    I have this scenario.
    with t as 
    (
    select 21009 item_id,9 primary_available,450 max_qty,100 bulk_available,12122 bulk_locator_id 
    from dual union all
    select 21009 item_id,9 primary_available,450 max_qty,2775 bulk_available,8704 bulk_locator_id 
    from dual union all
    select 21009 item_id,9 primary_available,450 max_qty,524 bulk_available,15614 bulk_locator_id 
    from dual union all
    select 21009 item_id,9 primary_available,450 max_qty,3300 bulk_available,15654 bulk_locator_id
    from dual)
    select  t.* from t;
    We have two locations for a given item_id. Primary and in bulk.

    I'm trying to get a select statement out of this point of view, where I will be restock the primary AMOUNT of sites in bulk, BUT the smaller bulk first. Once she gets up, I shouldn't take more product.

    There is an analytic function that would do this?

    That's the max I could come up with.
    with t as 
    (
    select 21009 item_id,9 primary_available,450 max_qty,100 bulk_available,12122 bulk_locator_id 
    from dual union all
    select 21009 item_id,9 primary_available,450 max_qty,2775 bulk_available,8704 bulk_locator_id 
    from dual union all
    select 21009 item_id,9 primary_available,450 max_qty,524 bulk_available,15614 bulk_locator_id 
    from dual union all
    select 21009 item_id,9 primary_available,450 max_qty,3300 bulk_available,15654 bulk_locator_id
    from dual)
    select  t.*, max_qty -
                   (primary_available + SUM(bulk_available)
                    over(PARTITION BY item_id ORDER BY bulk_available)) replen_this_much 
                    from t;
    So, in this scenario, I want to replen bulk_locator_id 100 ' 12122 'and ' 15614 bulk_locator_id 341'. That's all. ZERO of the other rentals (bulk_locator_id). If the question is not clear, please let me know.

    Published by: RPuttagunta on September 11, 2009 16:23

    Hello

    Thanks for posting the sample data.
    It would be useful that you also posted the output you want. Is this?

    .                                 BULK_         REPLEN_
    ITEM_ PRIMARY_   MAX_  BULK_      LOCATOR_        THIS_
    ID    AVAILABLE  QTY   AVAILABLE  ID               MUCH
    ----- ---------- ----- ---------- ---------- ----------
    21009 9          450   100        12122             100
    21009 9          450   524        15614             341
    21009 9          450   2775       8704                0
    21009 9          450   3300       15654               0
    

    If so, you can get to this:

    SELECT       t.*
    ,       GREATEST ( 0
                 , LEAST ( TO_NUMBER (bulk_available)
                         , TO_NUMBER (max_qty)
                        - ( TO_NUMBER (primary_available)
                          + NVL ( SUM (TO_NUMBER (bulk_available))
                                  OVER ( PARTITION BY  item_id
                                         ORDER BY      TO_NUMBER (bulk_available)
                                   ROWS BETWEEN  UNBOUNDED PRECEDING
                                     AND      1           PRECEDING
                                 )
                             , 0
                             )
                          )
                      )
                 ) AS replen_this_much
    FROM       t
    ORDER BY  item_id
    ,            TO_NUMBER (bulk_available)
    ;
    

    You should really store your numbers in NUMBER of columns.

    You essentially posted all what you need analytical functions. The problem was just wrapping this analytical function (or something very close to it) and LESS and more GRAND, so that the replen_this_much column is always between 0 and TO_NUMBER (bulk_available).

  • By using the analytical function to sort without showing this column in the result.

    Hello

    We use the Oracle 11.2

    How to use Oracle Analytics to sort the output of a query without showing this column in the result?

    Here's my query:

    Select distinct nvl(SRC_CHR_NM,'0') | » #'|| NVL(EXPL_SRC,'0') | » #'|| NVL(DIM_NM,'0') | » #'|| NVL(DIM_CHR_NM,'0') | » #'|| NVL(DIM_CHR_ABR,'0') | » #'||

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    DIM_NM

    from EXPL_CONFIG where SBJ_AREA_CD = 'PRMDTL. '

    I want to use analytical to sort by DIM_NM but I do not want to show. I want to just just the ALLOFIT column to show in the output.

    Something like "row_number() over (order by DIM_NM desc).

    Thank you!

    Hello

    If you SELECT SEPARATE, then you can only ORDER OF things in the SELECT clause. (Do you really need to do SELECT DISTINCT?  Often, it's just an inefficient way to remove the lines that do not need to be there at all).

    Move making the SELECT DISTINCT in a subquery and make the ORDER BY (and nothing else) in the main query.

    I hope that answers your question.

    If this isn't the case, please post a small example data (CREATE TABLE and only relevant columns, INSERT statements) and also publish outcomes from these data.

    Explain, using specific examples, how you get these results from these data.

    Always say what version of Oracle you are using (for example, 11.2.0.2.0).

    See the FAQ forum: https://forums.oracle.com/message/9362002#9362002

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  • Using SQL analytic functions

    Thanks in advance to anyone who might help

    I am writing a storage report. Try to calculate the use of space over a period of time. I need for a db_nm, tblsp_nm find the collections of the first and the last, and then find the difference in the space_used

    The structure of the table is like this
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    /
    create table tstg (db_nm varchar(10),
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    /
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    ---------- --------------- ---------- --------- ----------
    EDW        SYSAUX                  15      10-JUL-11          5
    EDW        SYSTEM                 150      10-JUL-11         50
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    ---------- --------------- ---------- --------- ----------
    EDW        SYSAUX                  10      01-JUL-11          0
    EDW        SYSAUX                  12      05-JUL-11          2
    EDW        SYSAUX                  15      10-JUL-11          5
    EDW        SYSTEM                 100      01-JUL-11          0
    EDW        SYSTEM                 120      05-JUL-11         20
    EDW        SYSTEM                 150      10-JUL-11         50
    /


    Thank you
    Eduardo

    Hello

    Thanks for the sample data.

    Here's a solution using the FIRST/LAST functions:

    select db_nm
         , tblsp_nm
         , max(collection_time) as collection_time
         , max(space_used) keep (dense_rank last order by collection_time) as space_used
         , max(space_used) keep (dense_rank last order by collection_time)
           - max(space_used) keep (dense_rank first order by collection_time) as diff
    from tstg
    group by db_nm
           , tblsp_nm
    ;
    
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