Random record
I'am looking for a way to randomly pick a record from an Access Database. I found this topic: http://forum.java.sun.com/thread.jspa?forumID=48&threadID=235843, but it isn't really what I am searching.
The problem is that my primary key field isn't successive because of deleting and adding records... So using for example Random = 1 + random.nextInt(10000); to select a primary key will not work because there are numbers missing. Is there another way to randomly select a record?
This is the code I use to connect with the database:
package database;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import domein.Vraag;
public class VraagManager {
private final static String LEES_VRAAG_SQL = "SELECT * FROM vragen";
Vraag vraagObject;
public Vraag getVraag()
Connection connection = Connectie.getInstance().getConnection();
// create Statement for querying database
Statement statement;
try {
statement = connection.createStatement();
// query database
ResultSet resultSet = statement.executeQuery(LEES_VRAAG_SQL);
resultSet.next();
String vraag = resultSet.getString("vraag");
String antwoord1 = resultSet.getString("antwoord1");
String antwoord2 = resultSet.getString("antwoord2");
String antwoord3 = resultSet.getString("antwoord3");
int correctAntwoord = resultSet.getInt("correctAntwoord");
Vraag vraagObject = new Vraag(vraag, antwoord1, antwoord2, antwoord3, correctAntwoord);
statement.close();
return vraagObject;
} catch (SQLException e) {
e.printStackTrace();
return null;
}
You are very helpful 8-) Anyway, I found a solution myself...
Maybe I can help other people with this:
Random randomNumber = new Random();
int randomInt = 1 + randomNumber.nextInt(numberOfRecords);
for(int i=0; i<randomInt; i++)
resultSet.next();
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How can I select the random records in u201Cstep loopu201D.
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Select Random Records with Group By?
Hi,
I currently select random records by using this type of SQL:
(SELECT *
FROM ( SELECT *
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Based on the following data, I now want to still pick out random records but I only want 1 record from the same ID and START_DATE but where the FLAG could be Y or N.
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DanielTry this [not tested]:
SELECT *
FROM
(SELECT *
FROM
( SELECT
ID
,START_DATE
,FLAG
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; -
Dynamic Table with Random Records
What I am trying to do is select random records from a table
and display them in a dynamic table with max columns set to 3 and
the 4th record to be on a new row. Below is what I have right now
and it works to randomly pick records but has no function to set
columns in a table. If there is an easier way feel free to let me
know. I have tried various ways to do this but none seem to work.
<CFQUERY NAME="getItems" DATASOURCE="absi">
SELECT catfit.*, modcats.*, prodmat.*, prod.* FROM catfit,
modcats,
prodmat, prod WHERE prodmat.prodid=catfit.prodid And
catfit.catid=modcats.catid
ORDER BY modl ASC </cfquery>
<cfif getItems.recordCount>
<cfset showNum = 3>
<cfif showNum gt getItems.recordCount>
<cfset showNum = getItems.recordCount>
</cfif>
<cfset itemList = "">
<cfloop from="1" to="#getItems.recordCount#"
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<cfset itemList = ListAppend(itemList, i)>
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<cfset itemCount = ListLen(itemList)>
<cfloop from="1" to="#itemCount#" index="i">
<cfset random = ListGetAt(itemList, RandRange(1,
itemCount))>
<cfset randomItems = ListAppend(randomItems, random)>
<cfset itemList = ListDeleteAt(itemList,
ListFind(itemList, random))>
<cfset itemCount = ListLen(itemList)>
</cfloop>
<cfloop from="1" to="#showNum#" index="i">
<cfoutput>
<table width="205" border="0" align="left"
cellpadding="0" cellspacing="0">
<tr>
<td width="235" height="116"> <div
align="center"><img
src="../Products/ProductPictures/#getitems.pic[ListGetAt(randomItems,
i)]#" width="100"></div></td>
</tr>
<tr>
<td
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i)]# #getitems.modl[ListGetAt(randomItems, i)]#</td>
</tr>
<tr>
<td
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</tr>
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href="../Products/details.cfm?prodid=#getItems.prodid[ListGetAt(randomItems,
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<tr>
<td> </td>
</tr>
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</cfoutput>
</cfloop>
</cfif>To start a new row after 3 records, do something like this.
<table>
<tr>
<cfoutput query="something">
<td>#data#<td>
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</table>
You should also know that your approach is very inefficient
in that you are bringing in to cold fusion more data than you need.
First of all you are selecting every field from 3 tables when you
don't appear to be using all of them. Second, you are selecting
every record and you only want to use 3. There are better ways out
there, but they are db specific and you did not say what you are
using. -
Morning all
Just a quick one.
How do I display a random record in DW?
I have a MySQL statement which is:
SELECT * FROM
tablename ORDER BY RAND() LIMIT 0,
number of records to display
The error message I get is:
'Syntax error (missing operator) in query expression RAND()
LIMIT 0'
If I alter 'RAND()' to 'RND()', I still get the error. If I
remove the '0' I still get the error.
Any ideas how to make this work?
I'm using Access BTW.
Regards
MartinTell your SQL statement what to RAND - right now it doesn't
know how to
randomize it, by what field.
"Pantyboy" <[email protected]> wrote in
message
news:ef0and$r7g$[email protected]..
> Morning all
>
> Just a quick one.
>
> How do I display a random record in DW?
>
> I have a MySQL statement which is:
>
> SELECT * FROM
tablename ORDER BY RAND() LIMIT 0,
number of
> records to
> display
>
> The error message I get is:
>
> 'Syntax error (missing operator) in query expression
RAND() LIMIT 0'
>
> If I alter 'RAND()' to 'RND()', I still get the error.
If I remove the '0'
> I
> still get the error.
>
> Any ideas how to make this work?
>
> I'm using Access BTW.
>
> Regards
>
> Martin
> -
I have a page that I have a recordset on just calling the
RecordID in the database. How would I have the page or recordset
select a random record and put that recordID in say a session
variable?
ThanksMySQL:
SELECT yourfield FROM yourtable WHERE ... ORDER BY rand()
LIMIT 1
MSSQL:
SELECT TOP 1 yourfield FROM yourtable WHERE ... ORDER BY
newid()
MS Access:
SELECT TOP 1 yourfield FROM yourtable WHERE ... ORDER BY
RND(yourprimarykey) [warning: this may not be random through
CF]
HTH
Tim Carley
www.recfusion.com
[email protected] -
I have a DB of sites that I need to query and pull in 5
records that are to be displayed in a random order.
I can limit the records but I'm struggling with displaying
them in a random order.
Any ideas?We're using MySQL as the DB and to clarify I need to pull in
5 random records in a random order.
I've just been emailed the answer by a friend so I'llpost it
up here.
"SELECT *
FROM tablename
WHERE somefield='something'
ORDER BY RAND() LIMIT 5"
Seems to work fine to me. -
I would like to have a section on my ASP page to generate a
random record that pulls from my database. So that each time the
page is opened/refreshed, a different record is displayed.
Any ideas?"Biggest Dave" <[email protected]> wrote in
message
news:e2nn6n$83e$[email protected]..
>I would like to have a section on my ASP page to generate
a random record
>that pulls from my database. So that each time the page
is
>opened/refreshed, a different record is displayed.
>
> Any ideas?
Yes.
Of course, since I don't know what database you're using, any
or all of
those ideas could be useless. -
Looking to create a random record repeat region where the
random records being pulled updates a hit count. i.e. a simple
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banners being rotated are in one folder... they are simply accounts
designated as being featured. I tried the order by rand() limit
5... error. changed to just rand() and that worked... but how do I
update a file based on that?darrel wrote:
>> i tried the code you provided, the 2 question
marks... but that didn't seem
>> to do it either. anyone else have any ideas on how
to update a hit counter
>> based on the random record recordset?
>
> Instead of being a smart-***, how about actually either
a) quoting the
> original question or b) repeating the question.
>
> Anyone that's going to be of any help to you uses the
newsgroup interface,
> not the crappy web forum, so when you reply to a
question that's several
> weeks/months old, we don't see the original post.
>
> So, as such, all we saw was your silly question mark.
I use a newsreader and saw the entire thread as if it was a
new one.
There was 3 days between the original posts and his question
mark. Maybe
a question mark wasn't the right way to get more attention to
the post...
Steve -
Hi guys,
Is there an easy way to display a random record from an XML
file? Current code:
HEAD
<script type="text/javascript">
<!--
var dsPower = new Spry.Data.XMLDataSet("broadband.xml",
"software/product");
//-->
</script>
BODY
<div spry:region="dsPower">{product_name}</div>
What i want to happen is when the page is loaded (and/or
reloaded) i want the {product_name} to randomly display any one of
my ten product names. I presume it requires use of {ds_RowID} and
some JavaScript, but am unsure of where to begin.
Thanks in advance for any help.nevermind people, i figured it out already. please close this topic.
-
Can someone tell me how to display a random record from a database? I want to use it on my site to show a "review"... am able to do it in ASP but not sure how to in JSP.
Any advice is gratefully received.
Mok man
you can put all object that you get it form DB in not
sorted contener as HashMAP. okYeah, then to further randomize it, you can use a Random Number to lookup in that HashMap. ;) Sounds interesting.
Annie. -
Selecting random records out of a table
Hi,
I guess this question isn't new, but I didn't found anything about this using the search of this forum.
How can I get e.g. 5 random records out of a table?
I have a small table, which stores the special offers of a shop. Let us say, there are 30 records in it. How can I fetch (e.g.) 5 random records of this table?
I tried to use this statement in a loop:
SELECT t_item_id FROM tbl_special_offers SAMPLE (1) WHERE ROWNUM = 1
But this is a very small table, so most of the query returns no data. Additionally I have to check if this number was already selected and ignore it in this case. This isn't a good solution, is it?
Can somebody help me out with a better solution? Thanks :)create or replace package shop_stuff
is
function random_number return number;
end;
create or replace package body shop_stuff
is
function random_number return number
is
begin
return dbms_random.value;
end;
begin
dbms_random.initialize (to_number(to_char(sysdate,'mmddsssss')));
end;
create table tbl_special_offers (t_item_id number);
insert into tbl_special_offers values (1);
insert into tbl_special_offers values (2);
insert into tbl_special_offers values (3);
insert into tbl_special_offers values (4);
insert into tbl_special_offers values (5);
insert into tbl_special_offers values (6);
insert into tbl_special_offers values (7);
insert into tbl_special_offers values (8);
insert into tbl_special_offers values (9);
insert into tbl_special_offers values (10);
select t_item_id
from (select t_item_id
from tbl_special_offers
order by shop_stuff.random_number)
where rownum <= 5
SQL> /
T_ITEM_ID
6
7
5
4
10
SQL> /
T_ITEM_ID
1
5
3
9
6
SQL> /
T_ITEM_ID
6
5
3
2
10
SQL> /
T_ITEM_ID
10
2
8
4
1
SQL> -
<p>I am trying to select ten random records from all that match the report selection criteria then report on each of these random records for QA/QI. I have tried the RND function however it is giving me a random number rather than a random record selection. I cannot figure this out and am despirately seeking assistance.</p><p>Thank you,</p><p>Amy</p>
<p>I don't know of any Random record selection functions but maybe you could write your own custom function inside of a record selection to randomly filter the records. You would use the Rand function we currently have to decide if a record was included in the report data or not.</p><p>Another possible option is to filter the records before they get to the report. You can only do this if you are pushing the data into the report instead of having the report pull the data. An example of this would be passing an ado recordset to a report at runtime. </p><p>Rob Horne</p><p>http://diamond.businessobjects.com/blog/10 </p>
-
I have a page on my site that displays certain information in
kind of a "feature" section, where it needs to query the database
based on certain criteria and then display the data for just one of
the records. The record should be different each time the page
loads. So, if my query has 10 or 20 records, I just want to select
one of them randomly and disply its data. What would be the best
way to code such a scenario?
Many thanks.first, a statement that contains "The record
should be different each time the page loads" and "select one
of them
randomly and display its data" is a bit of a contradiction:
you either
display a random record or you control which record to
display to make
sure each page load displays a different one.
if you just want a random record displayed (which means same
record may
be displayed on subsequent page loads) then how to do it
depends on
which database you are using, as cfSearching pointed out.
here's a great place to look to sql statements for this for
various db
systems:
http://www.petefreitag.com/item/466.cfm
if you want to display a different record each page load, you
need to
keep track which records have already been displayed
previously and
display the next one in sequence. you could do this by
storing the list
of record ids in an application-scope variable, displaying
the record
with the first id and removing that id from the list of ids.
when the
list is empty, query the db for record ids again and make a
list anew.
hth
Azadi Saryev
Sabai-dee.com
http://www.sabai-dee.com/ -
Random Records are being skipped while uploading data in PSA from CSV File
Hi Experts,
I am facing issue in data uploading in PSA through CSV file, Random Records are being skipped while uploading data in PSA.
First Load
We have flat file (.txt in CSV format), which contains 380240 Records.
We are uploading the flat file data into PSA from Application Server. But it uploads Only 380235 records, 5 Records are being skipped.
Second Load
We have re-generated same file next day, which contains same No of Records (380240), but this time it uploads Only 380233 records, 7 Records are being skipped.
We found 1 skipped record (based on key columns combination, by cross verifying from source and PSA table) from First load. But same records (combination of key column) is available in second load. It means same records are not being skipped every time.
Earlier (5 months ago) , We have loaded 641190 Records from flat file in same PSA and all records (641190) were uploaded successfully.
There is no change is Source, PSA and flat file structure.
Thanks & Regards
BijendraHi Bijendra,
Please check in the file if at the begining if it has got any excape sign then that record may be skipped so the records may be mssing
Please check the excape sign like ; if they are present at the beginign that recor entirely will be skipped.
Regards
vamsi -
Selecting Non repeatable random records
HI all,
I have 20 records in table. I want to get a random single record from that table.And the main thing is
if i having 20 records 1st time i'm getting a random record.the upcoming execution result that does not show previous random record .
That is out of 20 records ,each time i want to select record that does not occur previously.so at 20 executions i have 20 result with non-repeatable.
If i am confusing you,sorry for this.....pls help me to get a suffled record at each time
note: i'm used NEWID() that gives random records but it occurs previously some timeI cannot reproduce this :-)
with
[10] as (select 0 as c union all select 0),
[11] as (select 0 as c from [10] as a, [10] as b),
[12] as (select 0 as c from [11] as a, [11] as b),
[13] as (select 0 as c from [12] as a, [12] as b),
nums as (select top(20) row_number() over(order by c) as n from [13]),
choice as (select top(1) n from nums order by checksum(newid()))
select * from choice order by n
Best Regards,Uri Dimant SQL Server MVP,
http://sqlblog.com/blogs/uri_dimant/
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