Aggregate functions in EJBQL ???

Does the latest version of Oracle App server support aggregate functions like SUM/COUNT/AVG in the EJBQL?

Does the latest version of Oracle App server support aggregate functions like SUM/COUNT/AVG in the EJBQL? Hi Swami --
The latest version of Oracle9iAS - v903 is J2EE 1.3 compatible so it supports all of the EJB 2.0 specification.
The EJB 2.0 specification lists the following functions for EJBQL:
String Functions:
CONCAT(String, String) returns a String
SUBSTRING(String, start, length) returns a String
LOCATE(String, String [, start]) returns an int
LENGTH(String) returns an int
Arithmetic Functions:
ABS(number) returns a number (int, float, or double)
SQRT(double) returns a double
The latest version of the EJB 2.1 specification which will be part of J2EE 1.4, has added support for aggregate functions like orderby, sum, count, etc.
11.2.7.2 Aggregate Functions in the SELECT Clause
The result of an EJB QL query may be the result of an aggregate function applied to a path expression.
The following aggregate functions can be used in the SELECT clause of an EJB QL query: AVG,
COUNT, MAX, MIN, SUM.
We will support these when the EJB 2.1 specification is finalized and we produce our J2EE 1.4 compatible implementation.
cheers
-steve-

Similar Messages

  • EJB 3.0: EJBQL aggregate functions not working properly

    Hi!
    We are experiencing problems when using aggregate functions within EJBQL queries. In my case, we have to use max() function to retrieve the max start_date from a specific table. In order to do this, we wrote the following code:
    String strQuery = "select max(o.dt_fim) from Questionario o";
    Query queryTeste = em.createQuery(strQuery);
    List x = queryTeste.getResultList();
    OBS: dt_fim is an Oracle 10g datetime column, with its corresponding entity attribute in Questionario entity class.
    AFAIK, the query above should return only one record (object instance) containing the date value, right? However, it brougth a list of the entity objects, corresponding to all records in the table, as we had just run "select o from Questionario o".
    Examining the server log we can see this behavior:
    [TopLink Fine]:2006.09.12 01:47:55.526--
    ServerSession(7119662)--Connection(7048401)--Thread(Thread[ApplicationServerThread-0,5,RequestThreadGroup])
    --SELECT ID_QUEST, DT_INICIO, DT_FIM, DS_QUEST, DT_CRIACAO, TP_QUEST, NM_QUEST, COD_SEGMENTO, ID_GRUPO FROM TBBOP_QUEST
    Are anyone experiencing this issue?
    Is there any workaround?
    Any help would be much appreciated, since we need to deploy the application for user testing asap.
    Thanks in advance.
    Best regards,
    Gustavo
    PS: We are using JDeveloper 10.1.3.0.4(SU4)
    Message was edited by:
    Gustavo Lopes Sobral

    The 10.1.3.0 versions of JDeveloper contain our early preview of EJB 3.0 JPA functionality. One limitation is that the query language is not complete (released before the spec was finalized).
    You can use TopLink Essentials (JPA Reference implementation) whihc contains a complete compliant implementation of the final specification.
    http://otn.oracle.com/jpa
    The 10.1.3.1 JDeveloper preview ships with TopLink Essentials.
    Doug

  • Does EJBQL in JDeveloper support max aggregate function ?

    Does EJBQL in JDeveloper support max aggregate function ?
    I can't get it to work using select max(o.time) from MyObject o; It always returns the MyObject to me.
    Anybody knows how to do this ?
    Thanks.

    No one knows how exactly this works in JDeveloper 11g? As I see it, it's most likely a bug. For one, JDeveloper already supports plenty of databases and enforces some limitations on the useability of these databases where necessary (for instance, JDBC Positioning instead of Oracle's way of binding for the bind variables in a query). However, this enforcement does not happen with the WHERE clause of the view criteria in MySQL when you choose an operator that concatenates strings together in the WHERE clause, such as "contains". You'd expect it's smart enough to use different syntax for concatenating the strings, depending on the database (e.g., CONCAT for MySQL, || for Oracle). Second, lack of this enforcement should not break functionality, and here it does (searching with wildcards in LOV is just not possible declaratively with MySQL), which resembles a bug in the software.
    For now, I've completely rewritten the LOV in Java, so it's not declarative anymore, but programmatic. It works, resembles searching with "contains" and it stays that way, despite of the higher difficulty in maintenance, until this issue can be solved declaratively, by any means: via a patch release or via a workaround. I hope someone can provide me (and quite possibly others facing this issue) with insight upon this.
    Thanks in advance.

  • Trying to create a Histogram type/object for aggregate functions

    Hi,
    I am trying to create an aggregate function that will return a histogram
    type.
    It doesn't have to be an object that is returned, I don't mind returning
    a string but I would like to keep the associative array (or something
    else indexed by varchar2) as a static variable between iterations.
    I started out with the SecondMax example in
    http://www.csis.gvsu.edu/GeneralInfo/Oracle/appdev.920/a96595/dci11agg.htm#1004821
    But even seems that even a simpler aggregate function like one strCat
    below (which works) has problems because I get multiple permutations for
    every combination. The natural way to solve this would be to create an
    associative array as a static variable as part of the Histogram (see
    code below). However, apparently Oracle refuses to accept associate
    arrays in this context (PLS-00355 use of pl/sql table not allowed in
    this context).
    If there is no easy way to do the histogram quickly can we at least get
    something like strCat to work in a specific order with a "partition by
    ... order by clause"? It seems that even with "PARALLEL_ENABLE"
    commented out strCat still calls merge for function calls like:
    select hr,qtr, count(tzrwy) rwys,
    noam.strCat(cnt) rwycnt,
    noam.strCat(tzrwy) config,
    sum(cnt) cnt, min(minscore) minscore, max(maxscore) maxscore from
    ordrwys group by hr,qtr
    Not only does this create duplicate entries in the query result like
    "A,B,C" and "A,C,B" it seems that the order in rwycnt and config are not
    always the same so a user can not match the results based on their
    order.
    The difference between my functions and functions like sum and the
    secondMax demonstrated in the documentation is that secondMax does not
    care about the order in which it gets its arguments and does not need to
    maintain an ordered set in order to return the correct results. A good
    example of a built in oracle function that does care about all its
    arguments and probably has to maintain a similar data structure to the
    one I want is the PERCTILE_DISC function. If you can find the code for
    that function (or something like it) and forward a reference to me that
    in itself would be very helpful.
    Thanks,
    K.Dingle
    CREATE OR REPLACE type Histogram as object
    -- TYPE Hist10 IS TABLE OF pls_integer INDEX BY varchar2(10),
    -- retval hist10;
    -- retval number,
    retval noam.const.hist10,
    static function ODCIAggregateInitialize (sctx IN OUT Histogram)
    return number,
    member function ODCIAggregateIterate (self IN OUT Histogram,
    value IN varchar2) return number,
    member function ODCIAggregateTerminate (self IN Histogram,
    returnValue OUT varchar2,
    flags IN number) return number,
    member function ODCIAggregateMerge (self IN OUT Histogram,
    ctx2 IN Histogram) return number
    CREATE OR REPLACE type body Histogram is
    static function ODCIAggregateInitialize(sctx IN OUT Histogram) return
    number is
    begin
    sctx := const.Hist10();
    return ODCIConst.Success;
    end;
    member function ODCIAggregateIterate(self IN OUT Histogram, value IN
    varchar2)
    return number is
    begin
    if self.retval.exist(value)
    then self.retval(value):=self.retval(value)+1;
    else self.retval(value):=1;
    end if;
    return ODCIConst.Success;
    end;
    member function ODCIAggregateTerminate(self IN Histogram,
    returnValue OUT varchar2,
    flags IN number)
    return number is
    begin
    returnValue := self.retval;
    return ODCIConst.Success;
    end;
    member function ODCIAggregateMerge(self IN OUT Histogram,
    ctx2 IN Histogram) return number is
    begin
    i := ctx2.FIRST; -- get subscript of first element
    WHILE i IS NOT NULL LOOP
    if self.retval.exist(ctx2(i))
    then self.retval(i):=self.retval(i)+ctx2.retval(i);
    else self.retval(value):=ctx2.retval(i);
    end if;
    i := ctx2.NEXT(i); -- get subscript of next element
    END LOOP;
    return ODCIConst.Success;
    end;
    end;
    CREATE OR REPLACE type stringCat as object
    retval varchar2(16383), -- concat of all value to now varchar2, --
    highest value seen so far
    static function ODCIAggregateInitialize (sctx IN OUT stringCat)
    return number,
    member function ODCIAggregateIterate (self IN OUT stringCat,
    value IN varchar2) return number,
    member function ODCIAggregateTerminate (self IN stringCat,
    returnValue OUT varchar2,
    flags IN number) return number,
    member function ODCIAggregateMerge (self IN OUT stringCat,
    ctx2 IN stringCat) return number
    CREATE OR REPLACE type body stringCat is
    static function ODCIAggregateInitialize(sctx IN OUT stringCat) return
    number is
    begin
    sctx := stringCat('');
    return ODCIConst.Success;
    end;
    member function ODCIAggregateIterate(self IN OUT stringCat, value IN
    varchar2)
    return number is
    begin
    if self.retval is null
    then self.retval:=value;
    else self.retval:=self.retval || ',' || value;
    end if;
    return ODCIConst.Success;
    end;
    member function ODCIAggregateTerminate(self IN stringCat,
    returnValue OUT varchar2,
    flags IN number)
    return number is
    begin
    returnValue := self.retval;
    return ODCIConst.Success;
    end;
    member function ODCIAggregateMerge(self IN OUT stringCat,
    ctx2 IN stringCat) return number is
    begin
    self.retval := self.retval || ctx2.retval;
    return ODCIConst.Success;
    end;
    end;
    CREATE OR REPLACE FUNCTION StrCat (input varchar2) RETURN varchar2
    -- PARALLEL_ENABLE
    AGGREGATE USING StringCat;

    GraphicsConfiguration is an abstract class. You would need to subclass it. From the line of code you posted, it seems like you are going about things the wrong way. What are you trying to accomplish? Shouldn't this question be posted in the Swing or AWT forum?

  • Error in using aggregate function in Outer Query in Siebel Analytics

    Hi,
    When I am using aggregate function in outer query in Siebel Analytics I am facing error.
    Error Codes: OPR4ONWY:U9IM8TAC:OI2DL65P:OI2DL65P
    State: HY000. Code: 10058. [NQODBC] [SQL_STATE: HY000] [nQSError: 10058] A general error has occurred. [nQSError: 59111] The SQL statement must include a GROUP BY clause. (HY000)
    Bellow is the code.
    SELECT test1.username saw_0, test1.desg saw_1,COUNT (test2.querydate) saw_2
    FROM (SELECT POSITION.CBL username,
    POSITION.CBP desg
    FROM "CM"
    WHERE (POSITION.BPTCD = 'Marketing')
    AND (POSITION.EDate =TIMESTAMP '1899-01-01 00:00:00'
    ) test1,
    (SELECT users.UN username,
    measures."Query Count" querycount,
    measures."Max Total Time" secs,
    topic.db dashboardname,
    "Query Time".DATE querydate
    FROM "Plan"
    WHERE (topic."Dashboard Name" IN ('DS'))) test2
    WHERE test2.username = LOWER (test1.username)
    AND test2.dashboardname = 'DS'
    GROUP BY test1.username, test1.desg

    Should your query be a valid SQL query?
    I can't think that the query you have would be valid in a SQL plus window.
    Chris

  • Pivot table in BI Publisher: Different aggregate functions in data columns

    Hi, everyone!
    I`ve got some troubles with pivot table in my rtf-template.
    Here is my xml:
    <ROWSET>
         <ROW>
              <_BI_SUBRF_MO_._MUN_NAME_>МО Петроградский р-н</_BI_SUBRF_MO_._MUN_NAME_>
              <_BI_PERS_ACCOUNT_CARD_._BI_PAC_NMB_>714000003</_BI_PERS_ACCOUNT_CARD_._BI_PAC_NMB_>
              <_BI_MONTH_DEBET_._BI_DEBET_SUM_>0.0</_BI_MONTH_DEBET_._BI_DEBET_SUM_>
              <_BI_CALENDAR_._YEAR__>2009</_BI_CALENDAR_._YEAR__>
              <_BI_CALENDAR_._MONTH__>8</_BI_CALENDAR_._MONTH__>
         </ROW>
         <ROW>
              <_BI_SUBRF_MO_._MUN_NAME_>МО Петроградский р-н</_BI_SUBRF_MO_._MUN_NAME_>
              <_BI_PERS_ACCOUNT_CARD_._BI_PAC_NMB_>714000004</_BI_PERS_ACCOUNT_CARD_._BI_PAC_NMB_>
              <_BI_MONTH_DEBET_._BI_DEBET_SUM_>165.58</_BI_MONTH_DEBET_._BI_DEBET_SUM_>
              <_BI_CALENDAR_._YEAR__>2009</_BI_CALENDAR_._YEAR__>
              <_BI_CALENDAR_._MONTH__>7</_BI_CALENDAR_._MONTH__>
         </ROW>
         <ROW>
              <_BI_SUBRF_MO_._MUN_NAME_>МО Петроградский р-н</_BI_SUBRF_MO_._MUN_NAME_>
              <_BI_PERS_ACCOUNT_CARD_._BI_PAC_NMB_>714000004</_BI_PERS_ACCOUNT_CARD_._BI_PAC_NMB_>
              <_BI_MONTH_DEBET_._BI_DEBET_SUM_>165.58</_BI_MONTH_DEBET_._BI_DEBET_SUM_>
              <_BI_CALENDAR_._YEAR__>2009</_BI_CALENDAR_._YEAR__>
              <_BI_CALENDAR_._MONTH__>7</_BI_CALENDAR_._MONTH__>
         </ROW>
    ...... and so on..
    </ROWSET>
    In the pivot table i`d like to see one row for every BISUBRF_MO_._MUN_NAME_ using BICALENDAR_._YEAR__ and BICALENDAR_._MONTH__ as measures and sum of BIMONTH_DEBET_._BI_DEBET_SUM_ and count of unique (or at least just count of) BIPERS_ACCOUNT_CARD_._BI_PAC_NMB_ in cells.
    I create a pivot table using wizard, everything ok except one thing: as i understand, in pivot table for data in rows we can use only one kind of aggregate function e.g. only sum or only count.
    Is there any way to use different aggregate functions in data cells?
    Thank you

    As you can see, when we use crosstab tag we can specify only one aggregate function for data cells.
    Is there any way to get in XSL-FO (where we can what really happens) instead of:
    <T1>
    <xsl:value-of select="sum(current-group()/_BI_PERS_ACCOUNT_CARD_._BI_PAC_UNID_)"/>
    </T1>
    <T2>
    <xsl:value-of select="sum(current-group()/_BI_MONTH_DEBET_._BI_DEBET_SUM_)"/>
    </T2>
    this
    <T1>
    <xsl:value-of select="sum(current-group()/_BI_PERS_ACCOUNT_CARD_._BI_PAC_UNID_)"/>
    </T1>
    <T2>
    <xsl:value-of select="count(current-group()/_BI_MONTH_DEBET_._BI_DEBET_SUM_)"/>
    </T2>
    Edited by: user12115038 on 26.10.2009 8:08

  • Issue in pivot while using aggregate functions

    when I use this below query in oracle sql developer
    ------------->select sum(round(8.08/0.54,2)*30) from dual.
    i am getting result as 448.8.it is a correct value
    but i use this below queries in pivot as same like above query i am getting result of doubled value 914.4.
    PIVOT
    SUM(round(ROUND(sellout,2)/6,2)) AS LAST_6_MON_SELL_OUT,
    SUM(ROUND(inventory,2)) AS INVENTORY_INTINS_1,
    Sum(round(ROUND(inventory,2)/round(ROUND(sellout,2)/6,2),2)*30) As Stockperday
    FOR PRODUCT IN (56,78)
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    why this problem.can anybody explain me.why this problem

    Try ur luck in 'sql plsql thread'
    PL/SQL

  • Why doesn't PIVOT clause work with COLLECT aggregate function in 11g ?

    Hello all !
    I am really puzzled as to what is considered an aggregate function in the context of the PIVOT clause in 11g.
    I have been toying with quite a few things related to collections lately and this arose as an aside :
    CREATE TABLE TEST_COLL
       NODE_ID    VARCHAR2(15 CHAR) NOT NULL,
       NODE_VALUE VARCHAR2(45 CHAR) NOT NULL,
       NODE_LEVEL NUMBER(1)         NOT NULL
    CREATE OR REPLACE TYPE TREE_NODE AS OBJECT
       NODE_KEY  VARCHAR2( 15 CHAR),
       NODE_NAME VARCHAR2(127 CHAR)
    CREATE OR REPLACE TYPE TREE_NODES AS TABLE OF TREE_NODE NOT NULL;At this stage I am sure we all agree that the query
    SELECT NODE_LEVEL,
           CAST(COLLECT(TREE_NODE(NODE_ID, NODE_VALUE)) AS TREE_NODES) AS NODES
      FROM TEST_COLL
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    But then, one of the following two queries should work
    SELECT CAST(REGION_NODES     AS TREE_NODES) AS REGIONS,
           CAST(DEPARTMENT_NODES AS TREE_NODES) AS DEPARTMENTS,
           CAST(AREA_NODES       AS TREE_NODES) AS AREAS,
           CAST(CENTRE_NODES     AS TREE_NODES) AS CENTRES
      FROM (SELECT NODE_LEVEL, TREE_NODE(NODE_ID, NODE_VALUE) AS NODE
              FROM TREE_COLL
    PIVOT (COLLECT(NODE) FOR NODE_LEVEL IN (1 AS REGION_NODES,
                                             2 AS DEPARTMENT_NODES,
                                             3 AS AREA_NODES,
                                             4 AS CENTRE_NODES
    or (better)
    SELECT REGION_NODES     AS REGIONS,
           DEPARTMENT_NODES AS DEPARTMENTS,
           AREA_NODES       AS AREAS,
           CENTRE_NODES     AS CENTRES
      FROM (SELECT NODE_LEVEL, TREE_NODE(NODE_ID, NODE_VALUE) AS NODE
              FROM TREE_COLL
    PIVOT (CAST(COLLECT(NODE) AS TREE_NODES) FOR NODE_LEVEL IN (1 AS REGION_NODES,
                                                                 2 AS DEPARTMENT_NODES,
                                                                 3 AS AREA_NODES,
                                                                 4 AS CENTRE_NODES
           );yet, both fail with
    ORA-56902: expect aggregate function inside pivot operationInvestigating further, I found the same behaviour when using XMLAGG as the aggregate function in the PIVOT clause.
    Is this normal ? And if it is, is there any other way to achieve the result I was anticipating ?
    My version is
    SQL> SELECT BANNER FROM V$VERSION;
    BANNER
    Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
    PL/SQL Release 11.2.0.3.0 - Production
    CORE    11.2.0.3.0      Production
    TNS for 64-bit Windows: Version 11.2.0.3.0 - Production
    NLSRTL Version 11.2.0.3.0 - ProductionThanks in advance
    Best Regards
    Philip

    Most likely a bug. But you can bypass it by using any other aggregate making sure group consists of a single row and apply collect to a pivoted value. Yes, the cost is double aggregation. And also there is another cost - you would need to create MAP member function otherwise aggreations like MAX/MIN, etc. will not work:
    CREATE OR REPLACE TYPE TREE_NODE AS OBJECT
       NODE_KEY  VARCHAR2( 15 CHAR),
       NODE_NAME VARCHAR2(127 CHAR),
       map member function f return varchar2
    Type created.
    CREATE OR REPLACE TYPE BODY TREE_NODE AS
      map member function f return varchar2 is
      begin
         return NODE_NAME;
      end f;
    end;
    Type body created.
    CREATE OR REPLACE TYPE TREE_NODES AS TABLE OF TREE_NODE NOT NULL
    Type created.
    SQL> select  *
      2    from  test_coll
      3  /
    NODE_ID NODE_VALUE NODE_LEVEL
    1       A                   1
    2       B                   2
    3       C                   3
    4       D                   4
    5       E                   1
    6       F                   2
    7       G                   3
    8       H                   4
    8 rows selected.
    SQL> Now:
    SELECT CAST(COLLECT(REGION_NODES)     AS TREE_NODES) AS REGIONS,
           CAST(COLLECT(DEPARTMENT_NODES) AS TREE_NODES) AS DEPARTMENTS,
           CAST(COLLECT(AREA_NODES)       AS TREE_NODES) AS AREAS,
           CAST(COLLECT(CENTRE_NODES)     AS TREE_NODES) AS CENTRES
      FROM (
            SELECT  ROWID RID,
                    NODE_LEVEL,
                    TREE_NODE(NODE_ID, NODE_VALUE) AS NODE
              FROM  TEST_COLL
    PIVOT (MAX(NODE) FOR NODE_LEVEL IN (
                                         1 AS REGION_NODES,
                                         2 AS DEPARTMENT_NODES,
                                         3 AS AREA_NODES,
                                         4 AS CENTRE_NODES
    REGIONS(NODE_KEY, NODE_NAME)                         DEPARTMENTS(NODE_KEY, NODE_NAME)                     AREAS(NODE_KEY, NODE_NAME)                           CENTRES(NODE_KEY, NODE_NAME)
    TREE_NODES(TREE_NODE('1', 'A'), TREE_NODE('5', 'E')) TREE_NODES(TREE_NODE('6', 'F'), TREE_NODE('2', 'B')) TREE_NODES(TREE_NODE('7', 'G'), TREE_NODE('3', 'C')) TREE_NODES(TREE_NODE('8', 'H'), TREE_NODE('4', 'D'))
    SQL> SY.

  • Aggregate functions cannot be used in group expressions

    Hi have report showing sales by Vendor. I need to list all the vendors with Monthly Total>5000 and combine the rest as "OTHER VENDORS"
    Vendor is a Group in my report, so I tried to put an expression as a Group on:
    =IIF(Sum(Fields!Mth_1_Sales.Value)>5000,Fields!Vendor_No.Value,"OTHER VENDORS")
    I've got an error: "aggregate functions cannot be used in group expressions"
    How do I get Vendors with Sales < 5000 into  "OTHER VENDORS" ?

    Hi,
    You need to group by Month on group expression,
    And you can use the same expression in the report column as 
    =IIF(Sum(Fields!Mth_1_Sales.Value)>5000,Fields!Vendor_No.Value,"OTHER VENDORS")
    Many Thanks
    ..................................................................................................................................................................Please
    mark the post as Please mark the post as answered if this post helps to solve the post.

  • How can I use User-Defined Aggregate Functions in Timesten 11? such as ODCI

    Hi
    we are using Timesten 11 version and as per the documentation, it doesn't support User-Defined Aggregate Functions.
    So we are looking for alternatives to do it. Could you please provide your expert voice on this.
    Thanks a lot.
    As the following:
    create or replace type strcat_type as object (
    cat_string varchar2(32767),
    static function ODCIAggregateInitialize(cs_ctx In Out strcat_type) return number,
    member function ODCIAggregateIterate(self In Out strcat_type,value in varchar2) return number,
    member function ODCIAggregateMerge(self In Out strcat_type,ctx2 In Out strcat_type) return number,
    member function ODCIAggregateTerminate(self In Out strcat_type,returnValue Out varchar2,flags in number) return
    number
    How can I use User-Defined Aggregate Functions in Timesten 11? such as ODCIAggregateInitialize ?

    Dear user6258915,
    You absolutely right, TimesTen doesnt support object types (http://docs.oracle.com/cd/E13085_01/doc/timesten.1121/e13076/plsqldiffs.htm) and User-Defined Aggregate Functions.
    Is it crucial for your application? Could you rewrite this functionality by using standart SQL or PL/SQL?
    Best regards,
    Gennady

  • Can't have aggregate function in WHERE clause clause

    Dear all,
    I've created object in BO XI 3.1 Designer with following criterias:
    http://img4.imageshack.us/img4/833/20111201124314.th.jpg
    It is a simple number - 1,2,3,4,5.
    Now I need to use this object as a criteria for WHERE function in another object.
    http://img607.imageshack.us/img607/1543/20111201124717.th.jpg
    I receive an error "Can't have aggregate function in WHERE clause <clause>"
    How can I overcome this?
    P.S. I'm sorry in advance if such topic already exist - I didn't found one.
    Edited by: Ashot Antonyan on Dec 1, 2011 9:50 AM
    Edited by: Ashot Antonyan on Dec 1, 2011 9:51 AM

    Hi,
    You will have to use Sub query to achieve this. Give more details on what is available and what you need then i could help you out with the complete solution.
    Thanks,
    Ravichandra K

  • Any difference between distinct and aggregate function in sql query cost???

    Hi,
    I have executed many sql stmts patterns- such as:
    a) using a single table
    b) using two tables, using simple joins or outer joins
    but i have not noticed any difference in sql stmts in cost and in execution plan....
    Anyway, my colleague insists on that using aggregate function is less costly compared to
    distinct....(something i have not confirmed, that's why i beleive that they are exactly the same...)
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    select distinct deptno
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    select count(*), deptno
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    group by deptno select distinct owner, object_type from all_objects
    select count(*), owner, object_type from all_objects
    group by owner, object_typeHave you found any difference between the two ever...????
    Note: I use Ora DB 10g v2.
    Thank you,
    Sim

    distinct and aggregate function are for different uses and may give same result but if u r using aggregate function to get distinct records, it will be expensive...
    ex
    select distinct deptno from scott.dept;
    Statistics
    0 recursive calls
    0 db block gets
    2 consistent gets
    0 physical reads
    0 redo size
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    488 bytes received via SQL*Net from client
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    576 bytes sent via SQL*Net to client
    488 bytes received via SQL*Net from client
    2 SQL*Net roundtrips to/from client
    6 sorts (memory)
    0 sorts (disk)
    3 rows processed
    Nimish Garg
    Software Developer
    *(Oracle & ASP.NET)*
    Indiamart Intermesh Limited, Noida
    To Get Free Oracle & ASP.NET Code Snippets
    Follow: http://nimishgarg.blogspot.com

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