Rank as aggregate function - help

Similar Questions

• Groovy aggregate function based on condition

  Hi all

  I use jdev 12.1.3.0.0

  I've set up an aggregate function in my master EO as explained in the blog

  https://blogs.Oracle.com/ADF/entry/using_groovy_aggregate_functions_in

  I need to add a condition to the number of records based on an attribute of the object of details view. Algorithm for the use case is

  detailsAccessor.count ("SmsId")

  where detailsAccessor.MessageType is equal to "file."

  Could you help me write an expression to achieve this functionality.

  Thank you

  Mozakkir

  All aggregate in groovy functions accept a groovy as a parameter expression.

  So instead of detailsAccessor.count("SmsId") you can try something like: detailsAccessor.count ("MessageType is 'Applicant'")

  Or convert sum() like this: detailsAccessor.sum ("MessageType is"Applying"? 1: 0 ")"

  Dario

• Using java user-defined aggregate function

  Hello
  
  I'm trying to implement a with Java user-defined aggregate function.
  
  Here's the Code Javaclass:
  
  Import Java.util;
  Oracle.sql import. *;
  import java.sql. *;
  import Java.Math.BigDecimal;
  Oracle import. CartridgeServices.*;
  
  stored the context type
  
  public class StoredCtx_SecMax
  {
  private BigDecimal b_max;
  private BigDecimal b_secmax;
  
  public StoredCtx_SecMax()
  {
  b_max = new BigDecimal (0);
  b_secmax = new BigDecimal (0);
  }
  
  public void SchreibeMax (entry BigDecimal)
  {
  b_max = entry;
  }
  
  public void SchreibeSecMax (entry BigDecimal)
  {
  b_secmax = entry;
  }
  
  public BigDecimal LeseMax()
  {
  Return b_max;
  }
  
  public BigDecimal LeseSecMax()
  {
  Return b_secmax;
  }
  }
  
  implementation type
  
  / public class SecondMax_j implements SQLData
  {
  BigDecimal private key;
  
  Ultimate SUCCESS of static BigDecimal = new BigDecimal (0);
  Final static BigDecimal ERROR = new BigDecimal (1);
  
  
  Implement the SQLData interface.
  
  String sql_type;
  public String getSQLTypeName() throws SQLException
  {
  Return sql_type;
  }
  
  ' Public Sub readSQL (SQLInput stream, string typeName) throws SQLException
  {
  sql_type = typeName;
  key = stream.readBigDecimal ();
  }
  
  Public Sub writeSQL (SQLOutput stream) throws SQLException
  {
  stream.writeBigDecimal (key);
  }
  
  
  methods of the type that implements ODCITable interface
  
  public static BigDecimal ODCIAggregateInitialize (oracle.sql.STRUCT [] sctx)
  throws SQLException
  {
  Connection Conn = DriverManager.getConnection("jdbc:default:connection:");
  
  create a stored environment and store the result set in it
  StoredCtx_SecMax ctx = new StoredCtx_SecMax();
  
  context of registry stored with cartridge services
  Touch int;
  try {}
  key = ContextManager.setContext (ctx);
  } catch {} (EC CountException)
  error return;
  }
  
  Create an instance of StockPivotImpl and store the key of
  Object [] impAttr = new Object [1];
  impAttr [0] = new BigDecimal (key);
  StructDescriptor sd = new StructDescriptor ("SECONDMAX_J", conn);
  SCTX [0] = new STRUCT(sd,conn,impAttr);
  
  return a SUCCESS;
  }
  
  public BigDecimal ODCIAggregateIterate (BigDecimal input)
  throws SQLException
  {
  retrieve the context stored with the key
  CTX StoredCtx_SecMax;
  try {}
  CTX = (StoredCtx_SecMax) ContextManager.GetContext (Key.intValue ());
  } catch (InvalidKeyException ik) {}
  error return;
  }
  
  BigDecimal b_max;
  BigDecimal b_secmax;
  
  b_max = ctx. LeseMax();
  b_secmax = ctx. LeseSecMax();
  
  If (eingabe.compareTo (b_max) == 1)
  {
  CTX. SchreibeSecMax (b_max);
  CTX. SchreibeMax (input);
  }
  on the other
  {
  If (eingabe.compareTo (b_secmax) == 1)
  {
  CTX. SchreibeSecMax (input);
  }
  }
  
  return a SUCCESS;
  }
  
  public BigDecimal ODCIAggregateTerminate (double [] returnValue, int flags) throws SQLException {}
  
  retrieve the context stored with the key
  CTX StoredCtx_SecMax;
  try {}
  CTX = (StoredCtx_SecMax) ContextManager.clearContext (Key.intValue ());
  } catch (InvalidKeyException ik) {}
  error return;
  }
  
  returnValue [0] = ctx. LeseSecMax () .doubleValue ();
  
  CTX = null;
  
  return a SUCCESS;
  }
  
  
  public BigDecimal ODCIAggregateMerge (oracle.sql.STRUCT ctx2) throws SQLException {}
  
  
  return a SUCCESS;
  }
  }
  
  
  To implement this in the database, I use the following script:
  
  CREATE OR REPLACE TYPE IMPROG. SECONDMAX_J as object
  
  (
  INTEGER key,
  
  public static function ODCIAggregateInitialize (sctx IN OUT SECONDMAX_J)
  
  Return number
  IN THE JAVA LANGUAGE
  NAME "Java.Math.BigDecimal return from SecondMax_j.ODCIAggregateInitialize (oracle.sql.STRUCT []).
  ,
  
  
  
  Member ODCIAggregateIterate (self IN OUT SECONDMAX_J function,
  
  Number return value)
  IN THE JAVA LANGUAGE
  NAME "Java.Math.BigDecimal SecondMax_j.ODCIAggregateIterate return (Java.Math.BigDecimal).
  ,
  
  
  
  Member ODCIAggregateTerminate (self IN SECONDMAX_J function,
  
  Return returnValue NUMBER, flags in number number)
  IN THE JAVA LANGUAGE
  NAME "Java.Math.BigDecimal return of SecondMax_j.ODCIAggregateTerminate (double [], int).
  ,
  
  
  
  Member ODCIAggregateMerge (self IN OUT SECONDMAX_J function,
  
  CTX2 IN SECONDMAX_J) return number
  IN THE JAVA LANGUAGE
  NAME "Java.Math.BigDecimal SecondMax_j.ODCIAggregateMerge return (oracle.sql.STRUCT)".
  );
  /
  
  CREATE OR REPLACE FUNCTION F_SECONDMAX_J (NUMBER value) RETURN NUMBER
  
  PARALLEL_ENABLE
  
  AGGREGATION to the HELP of SecondMax_j;
  /
  
  
  
  When I now use the F_SECONDMAX_J function.
  
  "(Columnname) select F_SECONDMAX_J from Tablename t;
  
  It works perfectly and shows me the right result.
  
  Then I tried to implement the fusion part as follows:
  
  public BigDecimal ODCIAggregateMerge (oracle.sql.STRUCT ctx2) throws SQLException {}
  
  BigDecimal Key2 = null;
  
  BigDecimal ctx_max = null;
  BigDecimal ctx_secmax = null;
  
  BigDecimal ctx2_max = null;
  BigDecimal ctx2_secmax = null;
  
  retrieve the context stored with the key
  StoredCtx_SecMax ctx = null;
  try {}
  CTX = (StoredCtx_SecMax) ContextManager.GetContext (Key.intValue ());
  } catch (Exception e) {}
  
  }
  
  Object [] impAttr = ctx2.getAttributes ();
  
  Key2 = (BigDecimal) impAttr [0];
  
  retrieve the second context stored using the key2
  StoredCtx_SecMax ctx_sec = null;
  try {}
  ctx_sec = (StoredCtx_SecMax) ContextManager.GetContext (key2.intValue ());
  } catch (Exception e) {}
  
  }
  
  ctx_max = ctx. LeseMax();
  ctx_secmax = ctx. LeseSecMax();
  
  ctx2_max = ctx_sec. LeseMax();
  ctx2_secmax = ctx_sec. LeseSecMax();
  
  If (ctx2_max.compareTo (ctx_max) == 1)
  {
  If (ctx2_secmax.compareTo (ctx_secmax) == 1)
  {
  CTX. SchreibeSecMax (ctx2_secmax);
  }
  on the other
  {
  CTX. SchreibeSecMax (ctx_max);
  }
  CTX. SchreibeMax (ctx2_max);
  }
  on the other
  {
  If (ctx2_max.compareTo (ctx_secmax) == 1)
  {
  CTX. SchreibeSecMax (ctx2_max);
  }
  }
  
  return a SUCCESS;
  }
  
  When I now try the function
  
  "Select / * + parallel (t 4) * / F_SECONDMAX_J (Columnname) of Tablename t;
  
  I always get a pointer NULL-error because the variable key2 is always 0 and therefore the functions LeseMax() and LeseSecMax()
  in the second context 'ctx_sec' produce this error NULL pointer.
  
  To me it seems that each parallel process is the construction of an additional class for himself, which is not available are my main process.
  
  My question is now how it is possible to access the context of stored of the parallel process, so that I can combine the results.
  
  Thank you very much
  
  Josef

  Hi Josef,

  just guess that I've never implemented with java user-defined aggregate functions or support parallel execution:

  Maybe you have to implement ODCIAggregateWrapContext?

  + Application of ODCIAggregateWrapContext is optional. It should be implemented only when the external memory is used to hold the aggregative, context and the user-defined aggregate is evaluated in parallel (which is, stated as PARALLEL_ENABLE). If the user-defined aggregate is not evaluated in parallel, ODCIAggregateWrapContext is not necessary. +
  [http://docs.oracle.com/cd/B12037_01/appdev.101/b10800/dciaggfns.htm#i1004974]

  Report it to progress and success.

  Good luck
  Rainer Stenzel

• Bug with the aggregate function and no group

  When I run the following query:

  with the_table as
  (
    select 1 as id, 100 as cost from dual
    union all select 2 as id, 200 as cost from dual
    union all select 3 as id, 300 as cost from dual
    union all select 4 as id, 400 as cost from dual
    union all select 5 as id, 500 as cost from dual
  )
  select id, cost
  from
  (
    select id, cost
    from the_table
    --
    union all
    --
    select 0 as id, sum(cost) as cost
    from the_table
    where 0 = 1
    -- group by 1
  )
  order by id;

  I get this result:

  ID    COST
  --  ------
   0  <null>     
   1     100
   2     200
   3     300
   4     400
   5     500

  However, when I "uncomment" the line "Group 1", the query works as expected (without the id = rank 0).
  
  This occurs even when "the_table" is an array.
  
  Someone else comes through this (and if so, how long is a problem)?
  
  The database is 11.2.0.2.0 64-bit.
  
  EDIT: It also happens without a Union - the following returns a single line (with null 0 and cost of id) without the Group By and no line with her:

  select id, cost
  from
  (
    select 0 as id, sum(cost) as cost
    from 
    (
      select 1 as id, 100 as cost from dual
      union all select 2 as id, 200 as cost from dual
      union all select 3 as id, 300 as cost from dual
      union all select 4 as id, 400 as cost from dual
      union all select 5 as id, 500 as cost from dual
    )
    where 0 = 1
    -- group by 1
  )
  order by id

  Edited by: Donbot February 15, 2012 10:29

  Donbot wrote:
  Someone else comes through this (and if so, how long is a problem)?

  The database is 11.2.0.2.0 64-bit.

  This is a documented behavior.

  http://docs.Oracle.com/CD/E11882_01/server.112/e26088/functions003.htm#SQLRF20035

  "
  All except COUNT (*) GROUPING and GROUPING_ID aggregate functions ignore NULL values. You can use the NVL function in the argument of an aggregation function to substitute a value for a null value. COUNTY and REGR_COUNT never return null, but return a number or zero. For all remaining functions of aggregation, * if the DataSet contains no line, * or if it contains only the rows with NULL values as arguments to the aggregate function, * then the function returns null.*
  "

• SQL statement by using the min aggregate function result extract a line - how?

  Need help, try to do something seemingly simple. I'll give a simple example to illustrate the problem.
  
  I'll use a simple table of addresses with 4 fields.
  
  Create the table:

    CREATE TABLE "ADDRESSES" 
     (     "OWNER_NAME" VARCHAR2(20 BYTE), 
       "STREET_NAME" VARCHAR2(20 BYTE), 
       "STREET_NUMBER" NUMBER
     ) ;

  complete with 6 rows

  Insert into ADDRESSES (OWNER_NAME,STREET_NAME,STREET_NUMBER) values ('FRED','MAIN',1);
  Insert into ADDRESSES (OWNER_NAME,STREET_NAME,STREET_NUMBER) values ('JOAN','MAIN',2);
  Insert into ADDRESSES (OWNER_NAME,STREET_NAME,STREET_NUMBER) values ('JEAN','MAIN',3);
  Insert into ADDRESSES (OWNER_NAME,STREET_NAME,STREET_NUMBER) values ('JACK','ELM',1);
  Insert into ADDRESSES (OWNER_NAME,STREET_NAME,STREET_NUMBER) values ('JANE','ELM',2);
  Insert into ADDRESSES (OWNER_NAME,STREET_NAME,STREET_NUMBER) values ('JEFF','ELM',3);

  We now have this:
  Select * from addresses

  OWNER_NAME           STREET_NAME          STREET_NUMBER          
  -------------------- -------------------- ---------------------- 
  FRED                 MAIN                 1                      
  JOAN                 MAIN                 2                      
  JEAN                 MAIN                 3                      
  JACK                 ELM                  1                      
  JANE                 ELM                  2                      
  JEFF                 ELM                  3                      
  
  6 rows selected

  Now, I want to group by street name and obtain a number of houses. At the same time, I would like to know the number of the first and the last House

      select
      street_name,
      count(*) "NBR HOUSES",
      min(street_number) "First Number",
      max(street_number) "Last Number"
       from addresses
      group by street_name
  
  produces
  
  STREET_NAME          NBR HOUSES             First Number           Last Number            
  -------------------- ---------------------- ---------------------- ---------------------- 
  ELM                  3                      1                      3                      
  MAIN                 3                      1                      3                      
  
  2 rows selected

  Excellent. Now for the problem. I would also like to list on each line, the owner who lives at number House first and/or the last. It should be noted, assume that the name of the street and the number is unique
  
  It seems I have everything that I need. Don't know how to get home.
  
  I tried:

  select
      street_name,
      count(*) "NBR HOUSES",
      min(street_number) "First Number",
      max(street_number) "Last Number",
      (Select b.owner_name from addresses b where b.street_number = min(street_number) and b.owner_name = owner_name) "First Owner"
       from addresses
      group by street_name

  But getting a syntax error sql group function unauthorized when I add the subselect statement.
  
  any ideas?
  
  Thanks for any help.
  
  Published by: user6876601 on November 19, 2009 19:08
  
  Published by: user6876601 on November 19, 2009 19:30

  Hello

  Welcome to the forum!

  Get the minimum and maximum number for each street is a pretty simple concept; simpler to describe and simple to code.
  Now you want to the owner_name associate the maximum and minimum, which is a concept more complex; a little more difficult to describe and, unfortunately, much less simple to code and much, much more difficult to explain:

  select
      street_name,
      count (*)                "NBR HOUSES",
      min (street_number)      "First Number",
      min (owner_name) KEEP (DENSE_RANK FIRST ORDER BY street_number)
                      "First Owner",
      max (street_number)      "Last Number",
      min (owner_name) KEEP (DENSE_RANK LAST ORDER BY street_number)
                      "Last Owner"
       from addresses
      group by street_name
  ;
  

  You will notice that I used min for "Original owner" and "last owner". Why is this?
  The key word in these functions is the FIRST or the LAST word that comes after DENSE_RANK and before ORDER BY. The function at the beginning is simply a break.

  In other words, MIN in this context refers only to what needs to happen when there is a link to the first or last in the group. Even if such a thing is impossibe in your data, generic functions must have a mechanism to return a single owner_name when two or more rows have an equal right to having the highest street_number. For example, if we change the address of Joan in 1 hand, then MIN (street_number) is always 1, of course, but who is the person associated with the minimum street_number: Fred or Joan? Both have an equal claim that he owns with the smallest address on Main Street, but aggregate functions must return a single value, so we must have a mechanism to indicate to the system, whether to return 'JOAN' or 'FRED '. In this example, I arbitrarily in the network said een of tie, the lowest name, in alphabetical order, must be returned. In this case, 'FRED' would return, "FRED" prior to "JOAN".

  Thank you for including CREATE TABLE and INSERT!

• Why I can't use the nested aggregate function?

  Hello Experts,

  Why I can't use the nested aggregate function? There is not an ora-00979 group by error of expression.

  Oracle Database 11 g Release 11.2.0.4.0 - 64 bit Production

  Select

     SUM (BOX WHEN (KSD_CREATEDATE BETWEEN TRUNC((KSD_CREATEDATE)) AND TRUNC(MIN(KSD_CREATEDATE)) +60) THEN 1  ELSE 0 END) AS col

  DE TABLE_3_4

  GROUP BY STC_FIRMANO

  Thank you

  GROUP BY will manage the SUM function, but the MIN is used incorrectly - use another SELECTION to get it, or work with only with a single line. Otherwise, you could do WITH... get the SUM of SELECT MIN...

• Data model with decimal point in aggregate functions

  Hello

  In the data model when a summary aggregate function type is created, the decimal fields are displayed with ',' instead of '. '.

  Is it possible to tell displayed with decimal BEEP '. '?

  I solve it by copying the CS attribute and create a new by an element of expresion.

• Pivot table result without aggregate function

  Hi all

  We have the following two tables:

  SQL > select * from class;

  CLASS_ID COURSES

  ---------- ----------

  1          1

  2          1

  3          1

  2          2

  3          2

  5          2

  6 selected lines.

  SQL > select * of course.

  COURSE_ID

  ----------

  1

  2

  The customer needs the output in the following format:

  class class class class

  1                    1               2               3

  2                    2               3               5

  I considered using the operator pivot tables however they require the use of an aggregate function, but there is no aggregation only required in the result here - we demand that the output as would a PivotTable?

  Try this.

  WITH class(CLASS_ID,COURSE) AS)

  1.1 DOUBLE UNION ALL SELECT

  SELECT 2.1 DUAL UNION ALL

  SELECT 3.1 FROM DUAL UNION ALL

  SELECT 2.2 DUAL UNION ALL

  3.2 DUAL UNION ALL SELECT

  SELECT DOUBLE 5.2)

  SELECT * FROM)

  SELECT THE COURSE

  CLASS_ID,

  ROW_NUMBER () OVER(PARTITION BY COURSE ORDER BY COURSE) RN

  CLASS)

  PIVOT (MAX (CLASS_ID) for (RN) IN (1 as CLASS1, 2 AS CLASS2, CLASS3 AS 3));

  OUTPUT:

  CLASS CLASS1 CLASS2 CLASS3

  -------- ---------- ---------- ----------

  1          1          2          3

  2          2          3          5

• Aggregate functions

  Why aggregate (sum, min) function returns a line (with a null value) even though my there is no lines satisfying the where clause. Pls find the below example

  Select 1 from scott.emp where deptno = 1,011 - no row returned

  Select sum (sal) in the scott.emp where deptno = 1,011 - returns a row with null as a value. The thing is that if there are no rows in the emp table with a floating point number of employee. (Sum) should not have been called.

  Here's how that works:

  http://docs.Oracle.com/CD/E11882_01/server.112/e26088/functions003.htm

  All functions except aggregation COUNT (*), GROUPING , and GROUPING_ID ignore NULL values. You can use the NVL function in the argument of an aggregation function to substitute a value for a null value COUNT and REGR_COUNT never return null, but returns a number or zero. For all the remaining functions of aggregation, If the DataSet has no rows, or contains only rows with NULL values as arguments to the aggregate function, then the function returns the value null.

• Problem with my aggregate function

  Hello
  
  I tried to build my own global function in the chain, but I have a problem when I use it in my application. When I'm with her, he wrote ORA904, considering that this idenfifier exists. Do you know what is the problem?
  
  here my aggregate function:

  create or replace FUNCTION aggme (query_in in VARCHAR2) RETURN VARCHAR2 IS
      incoming    varchar2(4000);
      hold_result varchar2(4000);
      c sys_refcursor;
  Begin
      open c for query_in;
      loop
          fetch c into incoming;
          exit when c%notfound;
          hold_result := hold_result||','||incoming;
      end loop;
      return ltrim(hold_result,',');
  END;

  and here my request using my aggregate function aggme:

  select
    RES.LASTNAME as "LASTNAME",
    RES.FIRSTNAME as "FIRSTNAME",
    aggme('select NAME from PATHOLOGY where ID= RES.PATHOLOGY_ID') as "PATHOLOGY"
  from
    TBK_RESOURCE RES

  user539451 wrote:
  Hi BluShadow,

  I followed your advice and try to use the aggregation of clob. No problem to compile the function but when I use the clobagg to my query, is not aggregated. Perhaps, I don't use it correctly.

  select
  RES.PATIENT_LASTNAME as "LASTNAME",
  RES.PATIENT_FIRSTNAME as "FIRSTNAME",
  (select trim(',' from clobagg(name||',')) as "pathology" from pathology where ID= RES.PATHOLOGY_ID)
  FROM
  TBK_RESOURCE RES
  

  output, I have:

  FIRSTNAME. LASTNAME. PATHOLOGY
  TOTO | OTOT | ACB
  TOTO | OTOT | GB

  instead of having:
  TOTO OTOT ACB, GB

  Well, I don't have data to work with, but it works well for me...

  SQL> ed
  Wrote file afiedt.buf
  
    1  with t as (select 'TOTO' as FIRSTNAME, 'OTOT' as LASTNAME, 'PBR' as PATHOLOGY from dual union all
    2             select 'TOTO', 'OTOT', 'GB' from dual)
    3  --
    4  -- end of test data
    5  --
    6  select firstname, lastname
    7        ,trim(',' from clobagg(pathology||',')) as pathology
    8  from t
    9* group by firstname, lastname
  SQL> /
  
  FIRS LAST PATHOLOGY
  ---- ---- --------------------------------------------------------------------------------
  TOTO OTOT PBR,GB
  

• Performance of the aggregate function.

  Hello
  
  Version 11.2.0 Oracle
  
  I'm not a PL/SQL Developer, however, I decided to write this aggregate out function. Oracle has it but I tried TimesTen database in memory that does not yet function stddev.
  
  The code is as follows:

  CREATE OR REPLACE TYPE MyStddevImpl AS OBJECT
  (
    v_power NUMBER, -- sum(power^2) of the column
    v_sum   NUMBER, -- average value
    v_iteration NUMBER, -- count(1)
  
    STATIC FUNCTION ODCIAggregateInitialize(sctx IN OUT MyStddevImpl)
      RETURN number,
  
    MEMBER FUNCTION ODCIAggregateIterate(self IN OUT MyStddevImpl,
      value IN number)
      RETURN number,
  
    MEMBER FUNCTION ODCIAggregateTerminate(self IN MyStddevImpl,
      returnValue OUT number, flags IN number)
      RETURN number,
  
    MEMBER FUNCTION ODCIAggregateMerge(self IN OUT MyStddevImpl,
     ctx2 IN MyStddevImpl)
     RETURN number
  );
  /
  show error
  
  CREATE OR REPLACE TYPE BODY MyStddevImpl
  AS
  STATIC FUNCTION ODCIAggregateInitialize(sctx IN OUT MyStddevImpl)
  RETURN number
  AS
  BEGIN
    sctx := MyStddevImpl(0,0,0);
    RETURN ODCIConst.Success;
  END;
  
  MEMBER FUNCTION ODCIAggregateIterate(self IN OUT MyStddevImpl, value IN number)
  RETURN number
  AS
  BEGIN
    self.v_sum   := self.v_sum + value;   -- used to get averages
    self.v_power := self.v_power + power(value,2);
    self.v_iteration := self.v_iteration + 1;  -- total  number of rows
    return ODCIConst.Success;
  END;
  
  MEMBER FUNCTION ODCIAggregateTerminate(self IN MyStddevImpl, returnValue OUT
                                         number, flags IN number)
  RETURN number
  AS
    v_avg number;
  BEGIN
    v_avg :=  self.v_sum/self.v_iteration;   -- this is the average value
     -- sqrt((sum(power(amount_sold,2))-(count(1)*power(avg(amount_sold),2)))/(count(1)-1))
    returnValue := sqrt((self.v_power - (self.v_iteration * power(v_avg,2))) /(self.v_iteration-1));
    RETURN ODCIConst.Success;
  EXCEPTION
    WHEN VALUE_ERROR
    THEN
      RETURN ODCIConst.error;
  END;
  
  MEMBER FUNCTION ODCIAggregateMerge(self IN OUT MyStddevImpl, ctx2 IN
  MyStddevImpl)
  RETURN number
  AS
  BEGIN
   RETURN ODCIConst.Success;
  END;
  END;
  /
  show error
  CREATE OR REPLACE FUNCTION MyStddev (input NUMBER)
  RETURN number
  AGGREGATE USING MyStddevImpl;
  /
  show error
  exit

  Now, it works very well and returns the results OK.

  select mystddev(amount_sold) AS "My standard deviation", stddev(amount_sold) from sales;
  
  My standard deviation STDDEV(AMOUNT_SOLD)
  --------------------- -------------------
              259.78049           259.78049

  The problem I have is that it takes 10.5 sec to run

   select mystddev(amount_sold) from ssdtester.sales;
  
  MYSTDDEV(AMOUNT_SOLD)
  ---------------------
             273.172955
  
  Elapsed: 00:00:10.48
  
  Execution Plan
  ----------------------------------------------------------
  Plan hash value: 1047182207
  
  ----------------------------------------------------------------------------
  | Id  | Operation          | Name  | Rows  | Bytes | Cost (%CPU)| Time     |
  ----------------------------------------------------------------------------
  |   0 | SELECT STATEMENT   |       |     1 |     5 |  1324   (1)| 00:00:16 |
  |   1 |  SORT AGGREGATE    |       |     1 |     5 |            |          |
  |   2 |   TABLE ACCESS FULL| SALES |  1000K|  4882K|  1324   (1)| 00:00:16 |
  ----------------------------------------------------------------------------
  
  
  Statistics
  ----------------------------------------------------------
            1  recursive calls
            0  db block gets
         4965  consistent gets
            0  physical reads
            0  redo size
          558  bytes sent via SQL*Net to client
          524  bytes received via SQL*Net from client
            2  SQL*Net roundtrips to/from client
            0  sorts (memory)
            0  sorts (disk)
            1  rows processed

  Is there any scope to improve this code. Specifically can I use avg function in the code instead of working on myself?
  
  Thank you
  
  Mich
  
  Published by: Mich Talebzadeh on February 13, 2012 12:20

  >
  May I ask what is the purpose of the model of aggregate by Oracle functions if it will be row-by-row and he's not going to be effective.
  >
  Oracle online the way you did in your function.

  Your function, using the technology of data cartridges, will be called by Oracle for EACH LINE it reads each line corresponding to your query. This requires a change in context of SQL, PL/SQL, and then back to SQL. It is a very expensive operation in terms of time.

  The Oracle SQL engine is not that way for aggregate functions it provides. The functionality of data cartridge is provided to allow developers to extend Oracle to provide features that Oracle is not provde all. Use of these functions of cartridge cases, you develop may not be 'slow' because there is no equivalent Oracle to compare to. You can use the features of your new cartridge or do you without; you have no other choice.

  You should always use SQL from Oracle to do the job unless you are doing something that can be done in SQL. Then you should use of Oracle PL/SQL features (for example in BULK of treatment) to do the more complex things. Finally if you need to do something just that Oracle cannot do with out-of-the-box SQL or PL/SQL, then you turn cartridge data, custom Java or C code or other external solutions which you can interface to Oracle.

  The order of the solutions, you should look at is:
  1 SQL
  2 PL/SQL
  3 Java/C external
  4 data cartridge

  He explains a little better? (and it is frankly win again in a minute or two!)

• analytical function and the aggregate function

  What are the analytical function and the aggregate function. What is the difference between them?

  Hello

  Analytic Functions : -.

  Analytical functions calculate a value of aggregation based on a group of lines. They differ from aggregate functions because they return several rows for each group. The Group of rows is called a window and is defined by the analytic_clause. For each line, a sliding window of lines is defined. The window determines the range of lines used for the calculations for the current line. Window sizes can be based on a physical number of rows or a logic as the time interval.
  Analytical functions are the last set of operations performed in a query with the exception of the last ORDER BY clause. Every joint and every WHERE, GROUP BY and HAVING clauses are met before the analytical functions are handled. As a result, analytic functions can only appear in the select list or the ORDER BY clause.
  Analytical functions are commonly used to calculate cumulative aggregates, moving, centered and considered.

  Aggregate functions : -.

  Aggregate functions return a line of single result based on the groups of lines, rather than on the unique lines. Aggregate functions can appear in selection lists, as well as in the HAVING and ORDER BY clauses. They are commonly used with the GROUP BY clause in a SELECT statement, where Oracle Database splits the rows in a table when asked or seen in groups. In a query that contains a GROUP BY clause, the select list items can be aggregation functions, GROUP BY constant expressions or expressions involving one of them. Oracle applies the functions of aggregation for each group of rows and returns a single result for each group line.
  If you omit the GROUP BY clause, Oracle then applies any aggregate functions in the select list for all rows in the table queried or the view. You use aggregate functions in the HAVING clause to eliminate groups of the output based on the results of aggregate functions, rather than the values of the individual lines of the queried table or view.

  Let me know if you feel any problem understanding.
  Thank you.

  Published by: varun4dba on January 27, 2011 15:32

• How to include an aggregate function in a function user_defined

  I created the following function to validate the value of the commission of a table I created
  
  
  
  create or replace function validate_comm (number v_comm)
  return a Boolean value
  is
  VCOMM employeesCopy.commission_pct%type;
  Start
  Select max (commission_pct) in vcomm
  of employeesCopy
  where commission_pct = v_comm;
  If v_comm < vcomm then
  Returns true;
  on the other
  Returns false;
  end if;
  end;
  
  
  
  the service was created successfully, but when I run it as follows:
  
  
  
  Start
  If validate_comm (0.0) then
  dbms_output.put_line ('True');
  on the other
  dbms_output.put_line ('False');
  end if;
  end;
  
  
  
  He always gives the wrong data, even if the maximum value of commission_pct in my table is 0.4 but I always wrong whenever I run the function. Why? and is it true to put the aggregate function in the select statement?

  Hello

  If you don't want to UPDATE to each row of the table, and then add a WHERE clause to your UPDATE statement.

  You can do what you want without procedures or user-defined functions:

  update      employeesCopy
  set      commission_pct      = v_comm;
  where     commission_pct     < (
                      SELECT     MAX (commission_pct)
                      FROM     employeesCopy
                   );
  

  You didn't post a test version of your table, so I can't really test this.

  There are good reasons to want to do this in PL/SQL. If you have one, you can write a procedure reset_comm that executes the UPDATE above statement.
  If you want to make the statement to UPDATE a bit simpler by writing a function defined by the user (even if the net result is more coding and complexity more) so I think that a function takes no arguments and returning the MAX (commission_pct) would be more useful than something that had a fight and has returned a value depending on whether the qualified argument one line update , but if you don't want such a function, its arguments must be the values to take into account when it decides whether a line is updated. Should what value (s) on each line you consider in deciding if this line is up to date? If it's just commission_pct, then your procedure reset_comm might look like this:

  create or replace procedure reset_comm (v_comm number)
  is
  begin
       update      employeesCopy
       set      commission_pct = v_comm;
       where     validate_comm (commission_pct)     = 'OK';
  end;
  

• Aggregate function with joining

  Hi all
  I have the following SQL query, and I want to add a join with it:

  SELECT Collected_Goods.ProductId, SUM(Collected_Goods.Amount)
  
  FROM Collected_Goods
  
  GROUP BY Collected_Goods.ProductId

  and I want to replace or add (but it is better to replace) the Collected_Goods. ProductId with a product. Name where the product name is displayed in another table called products. I also want the SUM aggregate function to work on Collected_Goods.ProductId
  
  FK in Collected_Goods to the products is Collected_Goods.ProductId and Products.Id
  
  Thanks in advance
  
  Published by: ZiKaS on December 30, 2008 02:05

  Oops then try like this

  SELECT c.ProductId, p.Name, SUM(c.Amount)
    FROM Collected_Goods c
    JOIN Products p
      ON c.ProductId = p.ProductId
   GROUP BY c.ProductId, p.name
  

• Question of rank of analytic function

  Hi all

  Table with 2 columns table_name and category_name below. I want to give a sequence to a category, whenever the new category is found when the data is sorted by table_name and category_name.

  Sample data is

  create of the table xx_test_rank (table_name varchar2 (20), category_name varchar2 (40));

  insert into xx_test_rank values (' 1 ',' Delivery ');

  insert into xx_test_rank values (' 1 ',' Go Live ');

  insert into xx_test_rank values (' 1 ',' Support delivery ");

  insert into xx_test_rank values (' 1 ',' Support delivery ");

  insert into xx_test_rank values (' 2.B ',' Delivery ');

  insert into xx_test_rank values (' 2.B ',' Services ');

  insert into xx_test_rank values (' 2.B ',' Support delivery ");

  insert into xx_test_rank values (' 3.C ',' Completion ');

  insert into xx_test_rank values (' 3.C ',' Delivery ');

  insert into xx_test_rank values (' 4.D ',' Go Live ');

  insert into xx_test_rank values (' 4.D ',' Support delivery ");

  commit;

  If I write in request, category of benefit table 2.B shows new sequence. But I want him to have 1.

  SELECT table_name, category_name,

  DENSE_RANK () OVER (ORDER BY table_name, category_name) rk

  OF xx_test_rank

  ORDER BY table_name, category_name

  Please help me how I can get my result except in SQL.

  Table	Category	Dense rank	EXPECTED rank
  1.A	Delivery	1	1
  1.A	Go live	2	2
  1.A	Support delivery	3	3
  1.A	Support delivery	3	3
  2.B	Delivery	4	1
  2.B	Services	5	4
  2.B	Support delivery	6	3
  3.C	End	7	5
  3.C	Delivery	8	1
  4.D	Go live	9	2
  4.D	Support delivery	10	3

  Thank you
  Kishore

  Hi, Kishore,

  Interesting problem!

  Here's one way:

  WITH got_rk AS

  (

  SELECT table_name, category_name

  DENSE_RANK () OVER (ORDER BY table_name

  category_name

  ) AS rk

  OF xx_test_rank

  )

  got_min_rk AS

  (

  SELECT table_name, category_name, rk

  , MIN (rk) OVER (PARTITION BY category_name) AS min_rk

  OF got_rk

  )

  SELECT table_name, category_name, rk

  DENSE_RANK () OVER (ORDER BY min_rk) AS expected_rank

  OF got_min_rk

  ORDER BY table_name, category_name

  ;

  I wonder if there is a way to do it with 1 single subquery.  I'll post again if I think of a better way.

  Thanks for posting the CREATE TABLE and INSERT statements; It is very useful.