Extracting Random Records
Nov 3, 2006
If i have a table with several records let's say 1000 records, and each record has a field called cboCategory. Now from these 1000 records, lets say i have 200 records which has a value of CategoryA in the cboCategory field. Now is it possible that i extract "randomly" a number of records from that particular category chosen.
e.g.
Table -> 1000 records
records which belong to categoryA -> 200
extract 20 random records from the table which have a value of categoryA inthe cboCategory field.
Thanks for any suggestion.
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Jul 4, 2005
Was just wondering how i go about pulling out a range of records. I do not want to use my Primary Key autonumber value as some records have been deleted and selecting a range of 10 to 50 for example will not guarentee 40 records. Is there some way i can use an SQL command in the SQL View window to achieve this?
Cheers
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Aug 25, 2006
I need some help. I created a database to capture information from an employee survey. Most of the answers required a check if they agree or no check if they do not agree. There was one "memo" field inwhich we allow the employee to VENT. I have provided the team with all sorts of reports with percentages and figures. Now they want to remove any comment that had money, pay raise, bonus etc. They also want to organize the comments in some type of flow. Like all the "pats on the back" in one area, Day offs in another, plaque on wall grouped together, etc.
Can one of you experts, please give me some help?
Thanks!
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Jun 20, 2005
I need to select 200 random customers from my table, how can I do that?
Table: tblCustomers
PK: CustID
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Feb 20, 2006
Hi Guys,
I hope someone can help with this. I have a table, "Blasthole Submission" which is populated by input in a form, using the code below:
Const MyTable As String = "Blasthole Submission"
Const MyField As String = "Sample Name"
Dim db As DAO.Database
Dim rs As DAO.Recordset
Dim intCounter As Double
Set db = CurrentDb
Set rs = db.OpenRecordset(MyTable)
For intCounter = Me.txtStartValue To Me.txtEndValue
rs.AddNew
rs.Fields(MyField) = "TP" & intCounter
rs.Fields("Submission #") = Me.SubNum
rs.Fields("Sample Type") = "Blasthole"
rs.Fields("XRF") = "True"
rs.Fields("LOI") = "True"
rs.Update
Next intCounter
rs.Close
db.Close
Set rs = Nothing
Set db = Nothing
What I am hoping to do is to place a random duplicate in the table, called, for example TP111152 DUP, approximately every 50th record. Is there any easy way of doing this?
Thanks in advance for your help!
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Jul 25, 2006
This is my first post. Please help me.
Here's my DB :
Status : Number (Long Integer)
Random : Number (Double)
If Random value is around 0-0.9, the status value is 1
If Random value is around 0.9-1, the status value is 0
Here's my Query :
UPDATE DB Set Random = RND()
Rnd() give random value, but each records have the same value,
let's say 0.71212154
How can I update all records with random value,
with a single query ?
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Aug 9, 2007
As part of my job, each month I have to select 20 problem report resolutions and grade them on quality. Typically we have about 100 problem report resolutions per month. Is there a way I can use a query to return a random selection of 20?
Thanks,
Jim
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Mar 12, 2008
I have to review 20 reports each month for quality check. I have a query that lists the reports completed within the past 30 days. Is there a way to filter this query to show only 20 random records?
If there is no way to do this, can you suggest some way of doing this so that it's impartial? For example I don't want to select the first 20 of the month because everyone will catch on and wait late in the month to post their report. Normally about 70 reports are completed in a month.
Thanks,
Jim
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Apr 19, 2008
Hi all
I've been using the following code to show Random records from an Access Database, the only problem with it is that every now and again it throws a "division by 0 error" any ideas how i can fix?
Code:strsql_videos = "select top 5 * from items ORDER BY RND(id)*(id*1000) MOD datePart('s', NOW()), id;"set rs_videos = server.createobject("ADODB.recordset")rs_videos.open strsql_videos, conn_videos, 3, 1, adCmdText
Iam hoping its possible with a few lines of code rather than some elaborate fix :P
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Apr 2, 2006
Hi All,
Any ideas on how I do the following.
I have a table with 1500 records in it.
I want to select at random 4 of these records and append them into another table along with some other data that the query will not pick up, in this case Pilot and Month.
I guess I am having to go the VBA route but dont have a clue on how to do it.
Cheers in anticipation.
Andy.
INSERT INTO Assignments ( flightcode, aircraft, depart, destin, pilotcode, [Month] )
SELECT Schedule.Flightcode, Schedule.Aircraft, Schedule.Departure, Schedule.Destination, [pilot] AS Expr1, [MONTH] AS Expr2
FROM Schedule
WHERE (((Schedule.Departure) Like "man*"));
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Aug 9, 2014
I am fairly new to Access 2013 but am trying to create a query that will select random records from three totally unrelated tables and display the results together as if one table -- think video slot machine wheels. Each table has two fields - ID which is the primary key and NAME. The data in the tables are names of states, names of colors, and types of animals. Each table has a different number of records. My end result is a table that selects X number of random records from each table and displays them side by side like this:
Desired Result:
Animal Color State
cat red Ohio
dog blue Texas
fox green Iowa
I have been able to create three individual queries that will pull X number of random records by using:
SELECT TOP 10 Animals.[ID], Animals.[Name] FROM Animals ORDER BY Rnd(-(100000*[ID])*Time());
SELECT TOP 10 Colors.[ID], Colors.[Name] FROM Colors ORDER BY Rnd(-(100000*[ID])*Time());
SELECT TOP 10 States.[ID], States.[LongName] FROM States ORDER BY Rnd(-(100000*[ID])*Time());
Using the three queries above I get three separate lists. how to make one query that will randomly pull from all three tables and make the display above?
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Jul 31, 2013
I have a form which allows the user to add new records to a table. After the user had entered all the information into the form, they click a command button to add the record. In addition to adding the new record, my command button runs an query which is supposed to generate a random number between 1 & 1,000,000,000 and update the record ID field with that number.
Here is the formula I have been using in the "update To" now of my query: Int((1000000000-1+1)*Rnd()+1)
My problem is that I keep getting duplicates. You would think that the chances of getting a duplicate number would be pretty small with this large of a range, but I get a duplicate almost every time.
I have tried indexing (No duplicates) the field in the table, but that did not work. When my query generated a duplicate number, the record was just not added to the table.
I also tried a two step approach:
1-Make a table of all in use record ID numbers from my table (tblIdNo)
2-Update new record with a random number that is not in tblIdNo
This was a no-go too
How to build an update query that will update each new record added to the table with a random number between 1 & 1,000,000,000 without any duplicates? This seems like it should be so simple, and I am starting to get really frustrated.
I would prefer to accomplish this through a query/queries (if possible) rather than with 100 lines of code. This database is not for me, it's for another group, and the individuals in this group are totally freaked out by code.
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Jul 16, 2015
I'm trying to insert 10% of a dataset from dbo_billing into another table Random_Temp. Another form is open when this query is to be ran that passess in the billyear and billmonth... I'm sure it's a syntax issue as I can isolate the random number part and it displays the appropriate data, I just can't re-write it to insert into the other table:
INSERT INTO Random_Temp ( indx, peopleId, audited )
SELECT TOP 10 PERCENT b.indx, b.peopleId, b.audited
FROM dbo_Billing AS b
WHERE (((b.billYear)=[Forms]![billing]![billyear]) AND ((b.billMonth)=[Forms]![billing]![billmonth]) AND ((b.recertifying)=-1))
ORDER BY Rnd(-(1000*b.indx)*Time());
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Oct 3, 2013
I'm having trouble with my VBA module.I have a random test generator which pulls records based on a category from my table into a temp table using a make table query. I use the following code:
Private Sub Command2_Click()
DoCmd.SetWarnings False
DoCmd.OpenQuery "1", acViewNormal, acEdit
DoCmd.OpenReport "WrittenExam", acViewPreview, "", "", acNormal
Reports!WrittenExam.lblTitle.Caption = "Exam Name"
DoCmd.OpenReport "WrittenExamAnswerSheet", acViewPreview, "", "", acNormal
Reports!WrittenExamAnswerSheets.lblTitle.Caption = "Exam Name - Answer Sheet"
End Sub
My querry makes the table, and then generates two reports (my exam, and the answer sheet). I'm getting an error 3211, saying the temp table is already in use by another process when trying to generate both reports. I used a Macro before, but I have a need for custom report headings, so I'm using VBA.
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May 17, 2005
I've got a field in a table called GenTime. It is in a Date/Time format, like 5/16/2005 7:00:00 PM.
What I need to do is extract from this field the time, like 7:01:00 PM to 7:59:00 PM. I just can't seem to make it work?? :(
Help!
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Jan 12, 2006
Hi,
I have been sent a file of customer contacts. They are held in a single field and have the format firstname + surname. So that I can load this data into a enterprise database system, I need to be able to extract surname and first name into to separate fields.
Any ideas on how I achieve this through an Access query?
Many thanks
Clay
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Mar 1, 2007
Hi Everybody,
I have an access database and in a certain table I have a string field which has two values. I want to make a query that will show all the fields which contain a substring.
I'd better give an example:
Table: Kid
Fields:
Name: Ben
Activities: Soccer, Tennis
Name: Dan
Activities: Soccer
Name: John
Activities: Football, Origami
.
.
.
I want to show in a query all the Names which have a "Soccer" substring in their Activities string field
Need your help ASAP !!!
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Sep 19, 2007
Hi all,
In my query I can query for ODD or EVEN Street Numbers using the syntax below:
OE: [PROPHOUSENUMERIC] Mod 2
This works fine returning just odd or even numbers.
Now the problem I am facing now is that I wan the same query to return both Odd and Even Street numbers if I did not ask for either Odd or Even Street Numbers.
Is this possible. I have search hi and low in the forum but no answer. I have attached the file I am working with this post.
Thanks in advance.
matomo :confused:
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Aug 19, 2004
Can someone help me out with writing the expression to pull out the IDs that are duplicates?
I know it is something like count >1. thanks!
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May 5, 2005
Hi all: MS Access 2003. I have two text fields family_name and given_name I need to extract 1st, 2nd & 5th letter of family_name along with 2nd & 3rd letter of given_name to form a link_key field. If either name has insufficient letters the missing letter is replaced by the numeral 2. Does anybody know how to help me acheive this please!
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Jun 15, 2005
Hi,
I have a date field in one of my queries (01DEC2004). I have a pivot table linked to the query. I would like the users of the pivot table to be able to group the data by month. Currently the group feature will not work. Does anyone have a suggestion on the best way to extract the month from the date field?
Could I create a new column in the query called month and use an expression to extract the month?
If so can someone tell me how to key the expression to do this?
Thanks for any help.
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Jul 27, 2005
I found a thread from last year that is close to solving this question but not 100% so I'll post this new thread.
I have a field called ITEM_NUM in a database with the following structure:
XX-YYYYYYYYY
XX-YYYYY
XX-YYYYYYYYYYYY
I need to extract the Y portion of the data and a Query format would be the best.
FYI, the X portion consists of 2 Letters/numbers then the Hyphen and the Y portion is variable in length.
thanks for your help!
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Dec 13, 2005
You guys have been so helpful in the past. Perhaps you can help me with this as well. I believe it’s a bit out of my scope. I have a list that reads similar to this:
Field 1
DMA: ALBANY
CAR 1
CAR 2
CAR 3
DMA: BOSTON
CAR 1
CAR 3
CAR 4
CAR 5
CAR 6
DMA: HOUSTON
CAR 1
CAR 3
CAR 4
CAR 5
I need it to read like this:
Field 1 Field 2
DMA: ALBANY CAR 1
DMA: ALBANY CAR 2
DMA: ALBANY CAR 3
DMA: BOSTON CAR 1
DMA: BOSTON CAR 3
DMA: BOSTON CAR 4
DMA: BOSTON CAR 5
DMA: BOSTON CAR 6
DMA: HOUSTON CAR 1
DMA: HOUSTON CAR 3
DMA: HOUSTON CAR 4
DMA: HOUSTON CAR 5
If my list was this short, I would do it all manually, but my record list is in the 10,000s. Basically I want field 1 to read: DMA:ALBANY and Field 2 to read:CAR 1, and so on. I’ve tried linking the table to itself in a query, however, that hasn’t proven to be helpful. I've also searched the FAQ's and newsgroups. Any insight would be appreciated.
Thanks,
Amanda
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Dec 20, 2005
Hi,
I have a long list of customers / suppliers and their VAT numbers. I would like to create a query that shows only the customer/supplier number and the first 2 characters (countrycode) from their VAT number. for example
Supplier 3 VAT number NL80980808
endresult should show:
3 NL
Is there anyone that can help me out??
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Oct 3, 2006
I probably have an easy question for one of you out there, but I just cannot get it myself.
I need to extract the data between two characters in a string.
The data will be similar to this:
T4454: Text Text-Text: $296.07: Text Text
I need to get the dollar amount between the dollar sign and the colon on the right of it.
So far, I have this for my query:
Amount1: Mid$([subject],InStr([subject],"$"))
Which gets the amount to the left side, but also has the $ in it.
In the example above, I would like to just end up with 296.07 as the result from the query. I should also add that the dollar amount may vary from 1.00 to #,###.00
Thanks in advance for any help you can provide
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Aug 1, 2006
Hi,
I have a combo box, which the first and last name of an employee is combined using trim. Does anybody know of a way to seperate both fields as these would be used an a query so I would need them seen as 2 fields otherwise there won't be any matches.
Cheers,
Ben
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