Specific number of rows within field(s)

I'd like to get Top-N of Amt within Name&Loc as shown below.
Is there a way to reset either COUNT or ROWNUM to get this result?
Name---Loc--(ROWNUM)--Amt
James--abc--------1--1000
James--abc--------2---900
James--abc--------3---750
James--def--------1---500
James--def--------2---300
Jill---abc--------1---400
Jill---abc--------2---150
Jack---xyz--------1--2000
Jack---xyz--------2--1800
Thank you in advance for your help.

try this,
select rownum as rank,ename,sal from ( select ename,sal from emp order by sal desc) where rownum<6
This query works on EMP table of SCOTT user.
If you change "desc" to "asc" it will start from lower to higher values. You can also play with the condition ( rownum < 6 ) to fetch ur desired no. of rows.
Hope this helps,
Kalpen.
<BLOCKQUOTE><font size="1" face="Verdana, Arial, Helvetica">quote:</font><HR>Originally posted by Danielle:
Thanks for the reply, but that's not what I'm looking for.
Is there a way to get the Top-N (top 10,top20...)records within a group of fields (e.g. Name & Loc )?<HR></BLOCKQUOTE>
null

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Select a specific number of rows in query

How can a specific number of rows be selected in a query? For example, a query retrieves 30,000 records and I want to retrieve the output by groups of 5,000. I want the query to retrieve the first 5,000 records, then the next 5,000 records etc. I tried rownum but that does not work.
Thanks,
PANY

Not AGAIN. Please...........
Do you know how to Google? Search forum?
Why do you ask this boring FAQ AGAIN?
Sybrand Bakker
Senior Oracle DBA
Experts: Those who know how to search.

Getting a specific number of rows

Hi,
I would like to know how to get a specific number of rows. For example, I want to page data in my web application, so I'd like to be able to retrieve just 25 rows in my SELECT statement. I searched and I couldn't see anything under the obvious keywords of LIMIT and TOP (as used by other database vendors) so I'm wondering if possible, what do I need to do - a pointer to the relevant documentation would be helpful also.

You can achieve this with rownum
http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14200/pseudocolumns009.htm#i1006297
Best regards
Maxim

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set rowcount n

Return specific number of rows depending on the data in a column in table

Hi,
I have a table named orders which has column orderid and noofbookstoorder in addition to other columns.
I want to query the orders table and depending on the value of the 'noofbookstoorder' value return that number of rows.
Eg
Orderid noofbookstoorder
1 1
2 3
3 2
when I query the above data saying
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select * from orders where orderid=3;
it should return 2 rows and
select * from orders where orderid=1;
should return 1 row.
Is it possible to achieve this. If yes, then how do I write my query.
Thanks in advance.

with t as (
           select 1 Orderid,1 noofbookstoorder from dual union all
           select 2,3 from dual union all
           select 3,2 from dual
select t.*
from t,
        table(cast(multiset(select 1 from dual connect by level <= noofbookstoorder) as sys.OdciNumberList))
where Orderid = <order-id>
/For example:
SQL> with t as (
2             select 1 Orderid,1 noofbookstoorder from dual union all
3             select 2,3 from dual union all
4             select 3,2 from dual
5            )
6 select t.*
7    from t,
8          table(cast(multiset(select 1 from dual connect by level <= noofbookstoorder) as sys.OdciNumberList))
9    where Orderid = 2
10 /
   ORDERID NOOFBOOKSTOORDER
         2                3
         2                3
         2                3
SQL> with t as (
2             select 1 Orderid,1 noofbookstoorder from dual union all
3             select 2,3 from dual union all
4             select 3,2 from dual
5            )
6 select t.*
7    from t,
8          table(cast(multiset(select 1 from dual connect by level <= noofbookstoorder) as sys.OdciNumberList))
9    where Orderid = 3
10 /
   ORDERID NOOFBOOKSTOORDER
         3                2
         3                2
SQL> with t as (
2             select 1 Orderid,1 noofbookstoorder from dual union all
3             select 2,3 from dual union all
4             select 3,2 from dual
5            )
6 select t.*
7    from t,
8          table(cast(multiset(select 1 from dual connect by level <= noofbookstoorder) as sys.Odc
iNumberList))
9    where Orderid = 1
10 /
   ORDERID NOOFBOOKSTOORDER
         1                1
SQL> -- And if you want to select multiple orders
SQL> with t as (
2             select 1 Orderid,1 noofbookstoorder from dual union all
3             select 2,3 from dual union all
4             select 3,2 from dual
5            )
6 select t.*
7    from t,
8          table(cast(multiset(select 1 from dual connect by level <= noofbookstoorder) as sys.Odc
iNumberList))
9    where Orderid in (2,3)
10 /
   ORDERID NOOFBOOKSTOORDER
         2                3
         2                3
         2                3
         3                2
         3                2
SQL> SY.
Edited by: Solomon Yakobson on Oct 26, 2009 7:36 AM

Select specific number of rows

i'm listing all data entries in a database.
for that i want to select the 1st ten entires, then the next ten and so on ordered
by date_column.
how can i do that? is it possible with rownum?
in mysql/php i did it with limit
$query = "select * from article where parent_id=0 order by date desc, time desc limit $select, 10";
please email me.
thanks for help
chris

but what about rownum if i want the
records from 10-20?
<BLOCKQUOTE><font size="1" face="Verdana, Arial, Helvetica">quote:</font><HR>Originally posted by Chen Zhao ([email protected]):
If you are using Oracle 8i, you can use ROWNUM to specify the specific number of records. You can see the ROWNUM by querying:
SELECT *
FROM (SELECT column_name FROM table_name ORDER BY column_name)
WHERE ROWNUM<10
CHEN<HR></BLOCKQUOTE>
null

Setting a specific number of rows visiable in a JTable

Hi there,
I am implementing the Master-Detail pattern by using a using a JSplitPane to devide a JPanel into two.
In the upper split-pane I show a JTable as the Master View.
In the lower split-pane I show a JTable as the Detail View.
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The default behavier is that my SplitPane shows 1 and a half row and the tableHeader.
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table.setPreferredSize(...);Hi again,
thanks for input !
I tried your suggestion but it did not help me.
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JTextArea - set specific amount of rows, or characters...

I'm working on a Applet which handles text according to given parameters. One of these parameters sets a JTextArea to the horizontal size of, lets say: 5 rows. What i want is that once this TextArea is set to a specific number of rows no text beyond those rows can be inserted. 5 rows, or a specific amount of characters are allowed.
My problem is that the TextArea wont stop allowing text vertically. The TextArea is visibly set to 5 rows, which doesnt change. But how can i stop text from being inserted beyond row 5?
We have tried a number of different approaches, from trying to set TextArea's size with invisible scrollbars to overriding invalidate()...

I never understand why people want to limit the number of rows in a JTextArea. Add the text area to a scroll pane and scroll bars will appear when the number of rows exceed the display area. The point of using a text area is to allow the user to enter data in a flexible format. If the format is not flexible then maybe you should be using another component or combination of combination of components.
Setting a maximum character size is valid if you intend to store the data on a database with a fixed size field. It is easy to do this by using a custom Document with you JTextArea. Read this section from the Swing tutorial on "General Rules for Using Text Components" for example code on how to do this:
http://java.sun.com/docs/books/tutorial/uiswing/components/generaltext.html
Note, if you really want to limit the text area to 5 lines then count the number of new line characters in the document and don't allow them to enter more than 4.

Need value in one field to populate various number of rows in a table

I have a table created similarly to the sample Purchase Order form. I want the user to enter the quantity needed. Then I want to have a script populate the quantity field on each item in the table. However, some items that are ordered have a different number of parts. I'm not sure how to account for the various number of rows that may be encountered.
Thanks,
MDawn

Hi,
You can set the type to 'calculated - user can override' in the Object > Value palette. Example here: https://acrobat.com/#d=20TXqhWneiQhOMRVoJVXhQ
However I am not sure if you will get the user experience that you are after. You can set the quantity rawValue to match that of the first row. The user would be able to override this, but will get warning messages, which may be disconcerting.
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Niall

Returning specific rows within a resultset.

I have a table with the following rows:
Category Site Title
======== ==== ======
1 1 sometitle
123 1 sometitle
128 1 sometitle
4 1 sometitle
10 1 sometitle
I have a REF cursor that looks like this:
OPEN RefCursor FOR
SELECT Category, Site, Title
FROM TableName
WHERE Site = 1
ORDER BY Category;
Now...Here is the catch. In that same select statement, I want to be able to retrieve a specific range of rows to return, once the 'order by' is done.
I want to be able to execute my query, having it return rows 2 to 4...
So my RefCursor should contain:
Category Site Title
======== ==== ======
4 1 sometitle
10 1 sometitle
123 1 sometitle
The two important things are this:
1- The initial resultset must be sorted first..THEN I want to select specific rows.
2- The final result set MUST be a Ref Cursor.
Anyone have suggestions?

This will retrieve ordered rows 2 -4.
(SELECT Category, Site, Title
FROM
(select category, site, title
from tablename
order by category)
WHERE Rownum < 5)
MINUS
(SELECT Category, Site, Title
FROM
(select category, site, title
from tablename
order by category)
WHERE Rownum < 2)
/

How to Efficiently Sample a Fixed Number of Rows

Good afternoon. I need to select a specific number of random rows from a table, and while I believe my logic is right it's taking too long, 30 minutes for a routine data size. Hopefully someone here can show me a more efficient query. I've seen the SAMPLE function, but it just randomly selects rows on a one-by-one basis, without a guaranteed total count.
This is the idea:
INSERT INTO Tmp_Table (Value, Sequence) SELECT Value FROM Perm_Table, DBMS_RANDOM.VALUE;
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Project Person Sequence Position Keeper
A       Bill    1234     1        Yes
A       Fred    5678     3        No
A       George 1927     2        Yes
B       April   5784     2        No
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Populating the list with random values is not time-consuming, but calculating Position is. This is my code:
UPDATE Tmp_Targets T1
SET Position =
SELECT
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WHERE
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This is on 9.2, in case it matters. Thank you,
Jonathan

You've not given any indication of how max targets for a given project is determined, so for my example I'm using the ceiling of 1/2 of the number of records in each project which gives the same number of yes and no responses per project as you had:
with dta as (
select 'A' project, 'Bill' person from dual union all
select 'A', 'Fred' from dual union all
select 'A', 'George' from dual union all
select 'B', 'April' from dual union all
select 'B', 'Janice' from dual
), t1 as (
select project
       , person
       , row_number() over (partition by project order by dbms_random.value) ord
       , count(*) over (partition by project) cnt
       , rownum rn
    from dta
select project
     , person
     , ord
     , cnt
     , case when ord <= ceil(cnt/2) then 'Yes' else 'No' end keep
from t1
order by rn
PROJECT PERSON ORD                    CNT                    KEEP
A       Bill   2                      3                      Yes
A       Fred   3                      3                      No
A       George 1                      3                      Yes
B       April 1                      2                      Yes
B       Janice 2                      2                      No
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Restrict number of rows to be pulled from PeopleSoft's PS_LEDGER table while importing data in FDMEE

Hi,
We need to know if FDMEE 11.1.2.3.520 product supports restricting number of rows to be pulled from PeopleSoft's PS_LEDGER table.
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Currently, it is trying to pull all the records based on the given "period", "version" and "year" combination. We are looking to restrict rows based on specific account/entity/program/subprogram combination.
If this is can be done, will it be an out-of-the-box functionality or does it require any customization/import scripts/api.
Admin guide does say we can use Jython to filter rows using import scripts. However, it seems to be limited to file not a table as a source.
I have attached a document with the screenshots so that the issue is better understood !
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Hari

1)
When you set a column to hidden in a classic report using the method I described, it creates hidden form elements for that column.
<tt><input type="hidden" name="f01" value="" id="f01_0002"></tt>
You should inspect the source to figure out the name value.
Since this belongs to the wwv_flow form, we can therefore get this data with: wwv_flow.f01
Alternatively, you could have used the apex_item API to achieve the same result, which probably gives a bit better control.
http://docs.oracle.com/cd/E37097_01/doc/doc.42/e35127/apex_item.htm#CHDBFHGA
select apex_item.hidden(1, col) || col col
from table
Set that column to a standard report column so it doesn't escape the html.
You can also reference the data in these fields using PL/SQL using the apex_application API:
http://docs.oracle.com/cd/E37097_01/doc/doc.42/e35127/apex_app.htm#CHDGJBAB
2)
As above, setting the column to hidden creates hidden elements on the page. It is simply f01 because that is the only hidden field I would have on my page. With four reports on the page, you would need to be careful not to do the same on the other reports, as you would get inaccurate data. For each report, setting columns to hidden always starts with f01. In that, you would be best to use the apex_item API.
I actually initially ran into this issue when i had a tabular form on the same page as a report with hidden fields, which was causing conflicts in the page processes.
Hope it helps.

Number of Rows Displayed in a SQL Report Region

Hi,
Just wondering whether it is possible to control the 'Number of Rows' displayed under the 'Layout and Pagination' section within the Report Attributes page.
Basically need to know if I can programmatically control this or even better, can it be customized by the user as the user may want to see say 15 rows, 200 rows or 'All' rows of a certain region on the page. FYI, I have three different report regions on one page and want to give the user the flexibility to modify the number of rows displayed per region.
Thanks.
Tony.

Tony,
you can find that in this how-to document:
http://www.oracle.com/technology/products/database/htmldb/howtos/howto_report_rownum.html
Denes Kubicek

How to limit the number of rows in a report

I have several reports with a number of parameters - date ranges etc.
Depending on the parameter values selected by the user the reports can return thousands of rows.
I would like to limit the number of rows returned to, say, 500. If more than 500 rows are returned by the query then display an error message requesting that the user enter more specific parameters.
Ideally for performance reasons it would be good to catch the error before the datafile is generated, but I don't know if this is possible. Alternatively a check in the template might do the job - using COUNT on the group?.

Hi Hugh,
In your query, you got to add rowum < 500 or some sort of DB specific limit to the row being returned,
this will help to stop the report to get more than 500 records and the report template wont have any restriction.
or
you can do that in template too, but i would not recommend.
In these both cases or in any case, you cannot give any meaningful error if it exceeds N rows,there is no option like this till now.

Different number of rows for different columns in JTable

hi
I need to create a JTable with different number of rows for different columns...
Also the rowheight should be different in each column...
say there is a JTable with 2 columns... Col1 having 5 rows and column 2 having 2 rows...
The rowHeight in Col2 should be an integer multiple of Rowheight in Col1
how do I do this ??
can anybody send me some sample code ?????
thanx in advance

How about nesting JTables with 1 row and many columns in a JTable with 1 column and many rows.
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It would help if you were more specific about how you wanted it to appear and behave.

Specific number of rows within field(s)

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