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.

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Max aggregate functions

Hi,
in VBAK table i need latest date entered i.e max date value, field is ERDAT
can anybody write syntax for this
select max( ERDAT )
from vbak
into maxfeild
group by ERDAT.
endselect.
i think it is wrong can anybody write correct syntax.

Try using this code.
IF NOT it_ekpo[] IS INITIAL.
SELECT ebeln
         ebelp
         etenr
         eindt
         menge
         wemng
    FROM eket
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GETTING LATEST DATE
Thanks
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Message was edited by:
        Seshu Maramreddy

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.
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The following aggregate functions can be used in the SELECT clause of an EJB QL query: AVG,
COUNT, MAX, MIN, SUM.
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Aggregate function max

hi evrybdy
can we use MAX aggregate function to pick a field of type char from database table ...if yes thn how ..?
plzzz ans soon .
thank u .

No. Max is only for numbers. ( even it will not work for NUMC type )
OPENSQL statements will not work as ASCII format.
Cheers
Kothand

Pivot table wihtout Aggregate Functions ( Urgent Please. )

I am trying to select date and time. But having a hard time since I dont have any aggregate function that is needed. Just pivot the rows to columns.
IN sql
stage
starttime
endtime
1
1/22/2011 15:31
1/22/2011 15:32
2
1/22/2011 15:33
1/22/2011 15:34
3
1/22/2011 15:35
1/22/2011 15:36
Required
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endtime_s1
starttime__s2
endtime_s2
starttime_s3
endtime_s3
1/22/2011 15:31
1/22/2011 15:32
1/22/2011 15:33
1/22/2011 15:34
1/22/2011 15:35
1/22/2011 15:36

What is it that you're trying to accomplish with this?
The reason I ask is that pivoting data is a display function and therefore best left to the application or reporting tier.
If you're going to insist on "driving screws with a hammer" and really want to do this in SQL, the next question is, Is there a set number of "Stages" that will exist? Is it always going to be 3 stages and only 3 stages?
If the answer is YES, there will be a fixed number of stages, then it's a simple thing to do with either a PIVOT or CASE statements. (my personal preference is to use case statements, especially if you're pivoting 2 or more columns)
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The real problem with a Dynamic Pivot query is the fact that it's pretty much useless. You can't do much (if anything at all) with it... Due to the fact that they have variable numbers of columns, they can't be used in views or procs and I can't think of
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see the point.
Also... Aggregates aren't a problem based on the data you're showing. You only have 1 start time and 1 end time per stage. Using either the MIN or MAX aggregate functions will work to give you the desired result.
Anyway, hope that helps,
Jason
Jason Long

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";
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[TopLink Fine]:2006.09.12 01:47:55.526--
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Thanks in advance.
Best regards,
Gustavo
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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

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Folks,
Have any of you been playing around with SSAS 2005 to have worked out
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I was expecting it to do the equivalent of a simple AVG() with a GROUP
BY in SQL, but it seems to be doing something additional to that.
No-one in the team I work in has been able to work out what exactly it
is doing.
Any info would be appreciated!
Cheers,
Kenneth

This very question was recently discussed in the public SQL Server OLAP newsgroup:
http://groups.google.com/group/microsoft.public.sqlserver.olap/msg/c662e201b99678bc
>>
Aggregate Function Average of Children does not work
This behavior could occur because
AverageOfChildren,FirstChild,LastChild,FirstNonEmpty and LastNonEmpty are
semi-additive and treats the Time dimension different from the other
dimensions. Please refer to the following link for details:
http://msdn2.microsoft.com/en-us/library/ms175356.aspx
The description in above link (BOL) is not very clear about
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>>

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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
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I started out with the SecondMax example in
http://www.csis.gvsu.edu/GeneralInfo/Oracle/appdev.920/a96595/dci11agg.htm#1004821
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K.Dingle
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-- TYPE Hist10 IS TABLE OF pls_integer INDEX BY varchar2(10),
-- retval hist10;
-- retval number,
retval noam.const.hist10,
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return number,
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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;
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varchar2)
return number is
begin
if self.retval.exist(value)
then self.retval(value):=self.retval(value)+1;
else self.retval(value):=1;
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end;
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return ODCIConst.Success;
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end;
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retval varchar2(16383), -- concat of all value to now varchar2, --
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value IN varchar2) return number,
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flags IN number) return number,
member function ODCIAggregateMerge (self IN OUT stringCat,
ctx2 IN stringCat) return number
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number is
begin
sctx := stringCat('');
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end;
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varchar2)
return number is
begin
if self.retval is null
then self.retval:=value;
else self.retval:=self.retval || ',' || value;
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end;
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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;
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-- PARALLEL_ENABLE
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