Select subset of rows from league - help!

I have a league with 15 teams, but I only want to show 5 teams at a time. However, one of these teams must be my team (TeamX).
So I need a select statement that will find TeamX and will return 5 teams with 3 teams above and 1 below it.
However, if TeamX is within the top 3, I just need to display the top 5 teams, and if TeamX is bottom of the league, I just need to display the 4 teams above it!
I have absolutely no idea how to go about doing this!

This is not a very inspired solution...I guss I've been in the sun too long today. But, if your teams are ranked in order 1st, 2nd, 3rd, etc. then this should do the trick. You can move TEAMX around in the list to see the different use cases.
WITH teams AS
SELECT 'TeamA' team_name, 1 rank FROM dual
UNION ALL
SELECT 'TeamB', 2 FROM dual
UNION ALL
SELECT 'TeamC', 3 FROM dual
UNION ALL
SELECT 'TeamD', 4 FROM dual
UNION ALL
SELECT 'TeamE', 5 FROM dual
UNION ALL
SELECT 'TEAMX', 6 FROM dual
UNION ALL
SELECT 'TeamF', 7 FROM dual
UNION ALL
SELECT 'TeamG', 8 FROM dual
UNION ALL
SELECT 'TeamH', 9 FROM dual
UNION ALL
SELECT 'TeamI', 10 FROM dual
SELECT t1.team_name,
       t1.rank
FROM   teams t1,
        SELECT team_name,
               rank,
               max(rank) OVER () max_rank
        FROM   teams
       ) t2
WHERE t2.team_name = 'TEAMX'
AND    t1.rank >= least(greatest(t2.rank-3,1),t2.max_rank-4)
AND    t1.rank <= least(greatest(t2.rank-3,1),t2.max_rank-4)+4
ORDER BY t1.rank;
TEAM_       RANK
TeamC          3
TeamD          4
TeamE          5
TEAMX          6
TeamF          7Here's how it came out with TEAMX in 2nd...
TEAM_       RANK
TeamA          1
TEAMX          2
TeamB          3
TeamC          4
TeamD          5And in 9th...
TEAM_       RANK
TeamF          6
TeamG          7
TeamH          8
TEAMX          9
TeamI         10Greg

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Edited by: 854477 on Jul 13, 2011 5:01 AM

Solomon Yakobson wrote:
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svk

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jo**** wrote:
Hi. The problem is clear in the original post. The OP is trying to use PreparedStatement
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Edited by: 963214 on Oct 5, 2012 10:12 AM
Edited by: 963214 on Oct 5, 2012 10:40 AM

try this... hope this helps...
with xx as(
select '1' as aid,'john' as anm from dual union all
select '2' as aid,'mary' as anm from dual union all
select '3' as aid,'alvin' as anm from dual union all
select '4' as aid,'trevor' as anm from dual union all
select '5' as aid,'jess' as anm from dual
), yy as(
select '1' aid from dual union all
select '2' aid from dual union all
select '2' aid from dual union all
select '3' aid from dual union all
select '3' aid from dual union all
select '3' aid from dual union all
select '4' aid from dual union all
select '4' aid from dual union all
select '4' aid from dual union all
select '4' aid from dual union all
select '4' aid from dual union all
select '5' aid from dual
select x.* from
(SELECT a.anm as nm, COUNT(t.aid) AS worksold
FROM xx a, yy t
WHERE a.aid = t.aid
GROUP BY anm
order by worksold desc) x
where rownum = 1; gives
trevor 5In 2 ^nd^ table, i've considered only 1 column which is actually used. Rest columns are unessential.
Ranit B.
Edited by: ranit B on Oct 6, 2012 12:20 AM

How to select x numbered row from two tables

Hi,
I have one performance problem...
Here is sample scenario...
TableA
A1 A2 A3
a1     a12     a13
a2     a22     a23
a3     a32     a33
TableB
B1     B2     B3
b1     b12     b13
b2     b22     b23
I want result like
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a1     b1     a12     b12
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I have written it like
select
A1,
B1,
A2,
B2
from
(select A1, A2, rownum rnA from TableA) a,
(select B1, B2, rownum rnB from TableB) b
where rnA = rnB
but suppose TableA has 2500000 rows and
TableB has 500 rows then for 500 rows I have to
wait for all 2500000 rows scanning.
Is there any smart solution..?
I have created indexes for on columns A1, (A1,A2,A3), B1, (B1,B2,B3).
Curious:)
Rushang Kansara
Message was edited by:
Rushang Kansara

Here is explain plan
SELECT STATEMENT, GOAL = FIRST_ROWS               Cost=5     Cardinality=67     Bytes=3618
HASH JOIN               Cost=5     Cardinality=67     Bytes=3618
VIEW     Object owner=SFMFG          Cost=2     Cardinality=82     Bytes=2214
COUNT
TABLE ACCESS FULL     Object owner=SFMFG     Object name=TABLEA     Cost=2     Cardinality=82     Bytes=1148
VIEW     Object owner=SFMFG          Cost=2     Cardinality=82     Bytes=2214
COUNT
TABLE ACCESS FULL     Object owner=SFMFG     Object name=TABLEB     Cost=2     Cardinality=82     Bytes=1148
New to sql tunning Here why cardinality goes to 67 and cost to 5???
Thank you for your time.. :)

Random selection of rows from a 2D array then subset both the rows that were selected and those that were not. Please see message below.

For example, I have a 2D array with 46 rows and 400 columns. I would like to randomly select 46 data rows from the 2D array. By doing the random selection it means that not all individual 46 rows will be selected some rows may appear more than once as there may be some duplicates or triplicates in the random selection. The importan thing is that we will have randomly selected 46 rows of data (no matter that some rows appear more than once). Then I would like to subset these randomly selected 46 data rows (some which will be duplicated, or triplicated, etc.) and then also find and subset the rows that were not selected. Does this make sense? Then i would like to do this say 10 times for this data set. So that then I will have 2 by 10 data sets: the first 10 each with 46 rows and the other 10 with n rows depending on how many WERE NOT randomly selected. i hope that my explanation is clear. I am relatively new to Labview. It is really great so I am getting better! If anyone can help me with this problems it will be great. RVR

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In addition, I suggest you read the LabVIEW style guide.
Try to take over the world!

How to delete a selected row from datagrid and how to create a datagrid popup

hi friends,
              I am new to flex.i am doing a flex4 application,i need help for this.
            i am having a data grid with columns.i have two questions.
           Ques 1: when i selected a partiuclar row from a datagrid and click delete button means that record will delete from the datagrid and DTO from the cloud tables also.
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REQUIREMENT example: first screen:           i am using with data grid 3 columns (Student Roll number ,Student Name,Student pecentage)---->save--->data will store in cloud DTO.
Second screen:                search button ----> it need show datagrid popup.it will have data which we saved in the first screen with same columns(Student Roll number ,Student Name,Student pecentage).
This is my requirement.
Any suggession welcome.
Thanks in advance.
B.Venkatesan

Lets break the problem statement in multiple steps
1. We need a way to know the selection on all rows.
2. We need the association of the checkBox with the data
The solution is to use a arrayCollection/array that holds all the instances created for checkbox.This collection should be a property of component containing the datagrid. We need to use a custom component implementation or inline ItemRenderer. The way you have used is called dropinItemRenderer. Preferaly use custom component implementation and add the instance to the arrayCollection at CreationComplete. Make sure you use addItemAt so that you add the instance in the same row as the data. To get rowIndex the custom Checkbox should implement IDropInListItemRenderer. You could iterate this collection to check all the instances that are checked.
Note: This is the approach considering your dataprovider doesnt have a selection field.
Nishant

How to delete a Selected row from datagrid and how to create a datagrid popup with saved values

hi friends,
              I am new to flex.i am doing a flex4 application,i need help for this.
            i am having a data grid with columns.i have two questions.
           Ques 1: when i selected a partiuclar row from a datagrid and click delete button means that record will delete from the datagrid and DTO from the cloud tables also.
            Ques 2: when i save the data grid values using save button means that data will store in respective cloud DTO which is related to the datagrid,
                My requirement is i am using a search button when i click the search button it will show a datagrid that datagrid will contain the previous datagrid datas which is saved in the cloud.
REQUIREMENT example: first screen: i am using with data grid 3 columns (Student Roll number ,Student Name,Student pecentage)---->save--->data will store in cloud DTO.
Second screen: search button ----> it need show datagrid popup.it will have data which we saved in the first screen with same columns(Student Roll number ,Student Name,Student pecentage).
This is my requirement.
Any suggession welcome.
Thanks in advance.
B.Venkatesan

Lets break the problem statement in multiple steps
1. We need a way to know the selection on all rows.
2. We need the association of the checkBox with the data
The solution is to use a arrayCollection/array that holds all the instances created for checkbox.This collection should be a property of component containing the datagrid. We need to use a custom component implementation or inline ItemRenderer. The way you have used is called dropinItemRenderer. Preferaly use custom component implementation and add the instance to the arrayCollection at CreationComplete. Make sure you use addItemAt so that you add the instance in the same row as the data. To get rowIndex the custom Checkbox should implement IDropInListItemRenderer. You could iterate this collection to check all the instances that are checked.
Note: This is the approach considering your dataprovider doesnt have a selection field.
Nishant

How do I select a row from the middle of a recordset?

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10 9 N
10 8 N
10 7 N
10 6 N
10 5 Y
10 4 Y
10 1 Y
From the table sorted by QuestionID DESC, how do I select the first row from the bottom going up with Answered value equal to 'N'?
Which in the example above would be:
10 6 N
I need to select this row and get the QuestionID value equal to 6.
Right now I have:
select QuestionID
from tblMap
where Answered = 'N'
and ROWNUM = 1
order by QuestionID ASC;
This always the top most row, which would be:
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Here i used DUAL to generate a list of numbers for me.
ME_XE?select *
2 from
3 (
4     select row_number() over (order by col1 desc) as rn, count(*) over() as cnt, col1
5     from
6     (
7        select level as col1 from dual connect by level <= 9
8     )
9 )
10 where ceil(cnt/2) = rn
11 /
                RN                CNT               COL1
                 5                  9                  5
1 row selected.
Elapsed: 00:00:00.07
ME_XE?Edited by: Tubby on Jul 8, 2009 1:47 PM
Seems i misread the question :)

How to save the selected rows from Advance table into database

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I have requirement like..
In custom page , Manager Search the Candidates and selects the candidate ROWS from advance table.
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hi Reetesh,
In Custom page
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My problem is this: I am not in control of the SQL that is sent to the database. It is autogenerated by a third party tool (TOPLink). Therefore using the rownum solution isn't practical. My steps of operation are:
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[email protected]

Hi Michael,
Is there some sort of selection criteria in which you could use return the required 200-250 rows of data? If so, I would embed that into the TopLink query.
Another option is using the ORDER BY operator. Without order, constructing a query of elements 200-250 twice would not guarentee that they would be the same elements.
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Darren Melanson
Strategic Implementation Consultant
Oracle Canada.
I am trying to figure out a way to get a subset of rows from a ResultSet (or ResultSet equivalent) without using rownum and without sending all the rows before the requested row over the wire.
My problem is this: I am not in control of the SQL that is sent to the database. It is autogenerated by a third party tool (TOPLink). Therefore using the rownum solution isn't practical. My steps of operation are:
1. Get SQL from TOPLink
2. Pass SQL through a Statement
3. Get resulting ResultSet
At this point, I want to say, "Mr. ResultSet, I only want rows 200-250." And I then want Mr. ResultSet to fetch only rows 200 to 250, and no others. I don't want to see rows 1 to 199 coming over the wire.
Anyone have any ideas? Is this possible at all? Also, if there's a way to do this through the TOPLink mechanisms (ScrollableCursors and ReportQuery objects and whatnot), please do let me know. I have tried using the TOPLink facilities, and sure enough rows 1 to 199 flow across the network.
Thanks,
Michael Allen
[email protected]

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