Tables :: Many To Many Relationships - Prevent Same 2 Records From Being Associated Twice
Sep 12, 2012
I'm learning how to do Many to Many relationships and I think I've got the basic idea down, I am just not sure how to prevent the same 2 records from being associated twice.
For example:
My practice database deals with Authors and Books.
I was able to set it up so that Mike Gunderloy and Susan Harkins are both Authors of the book: "Upgrader's Guide to Microsoft Office System 2003".
I was also able to set it up so that Mike Gunderloy and Susan Harkins are both Authors of the book: "Automating Microsoft Access 2003 with VBA".
The thing I want to prevent is something like this:
Book:
- Automating Microsoft Access 2003 with VBA
Authors:
- Mike Gunderloy
- Susan Harkins
- Susan Harkins (Duplicate)
And vise versa
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Jan 2, 2013
Table in my access 2010 is configured to have a unique records (no duplicates)which has now records more than 2000 so i copied the table and pasted Structure only. what i would like to have is that new table which presently is empty should not add any record which is already available in old table. While entering data in new table i would like users to see the error if they try to enter the record which was previously entered in old table.
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Dec 13, 2005
What is the best way to prevent widowed records? By widow record I mean records in the parent table that do not have a related record in the child table.
I have a tblOrder that is linked to a tblProductOrder by the OrderID field. I don't want the user to be able to create a record in tblOrder without adding some products to the order, which will be stored in tblProductOrder.
Thanks for the help.
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Jan 13, 2007
i am using a textbox in the main form to transfer the Yr/Mth into the table. (refer to qp.zip)
now my problem is, how do i prevent duplicate records into the table?
e.g: currently whenever i scroll ard the months control in the form, i will get duplicate Mth/Yr into the table. how do i prevent that from happening?
i only want to have updated data inside the Mth/Yr table instead of duplicated Mth/Yr
Public Sub PutInMonthlyRecords()
Dim sql As String
Dim Db As DAO.Database
Dim rs As DAO.Recordset
Dim f As Form
Dim MthYr As String
Set f = Forms!frmQpi
MthYr = f("txtMthYr")
sql = "SELECT * FROM [tblQpiMonthly] WHERE (([tblQpiMonthly].[Input MthYr] = 'MthYr' ));"
Set Db = CurrentDb()
Set rs = Db.OpenRecordset(sql)
If rs.RecordCount = 0 Then
If (f!txtTotalPF) = 0 Then
Exit Sub
End If
rs.AddNew
rs![Input MthYr] = f("txtMthYr")
rs![Monthly TotalPF] = f("txtTotalPF")
rs![Monthly Rejection] = f("txtTotalAvoid")
rs![Monthly TotalAvoid] = f("txtRejection")
rs.Update
Else
If (f!txtTotalPF) = 0 Then
rs.Delete
Exit Sub
End If
rs.Delete
rs.AddNew
rs![Input MthYr] = f("txtMthYr")
rs![Monthly TotalPF] = f("txtTotalPF")
rs![Monthly Rejection] = f("txtTotalAvoid")
rs![Monthly TotalAvoid] = f("txtRejection")
rs.Update
End If
Db.Close
End Sub
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Mar 24, 2007
I have a database with several forms, tables, queries etc. and it works fine. One of the users of the database accidentally deleted a record which was displayed by a query. I have selected AllowDelections = No in all object properties. Despite this, the record got deleted. Is there a way to prevent such deletions? Kindly help.
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Apr 7, 2008
I have a form, that once prompted, finds a certain record for the user. How do I prevent the user from being able to see any other records but that one, once the form is opened? The user needs to be able to edit the particular record they opened, without viewing or editing any other records in the database. Is there a way to hide the bar at the bottom of the form that allows users to manipulate through the different records?
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Apr 17, 2008
I am using a data entry form to enter new data into one of the tables.How can we prevent entry of duplicate records? Duplicacy shall be checked on the first two fields only.
Please help.
regards
bijon
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May 8, 2005
Hey guys..
is there any way in which i can prevent the user operating a form from adding or deleting or editing any records ?
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Sep 5, 2006
Hello, I HAVE searched the forums for many days but I could not find a solution. Maybe I'm not sure what to look for...
The MAINFORM_1(single form view) is based on a Query and has a cbo named 'cbo_client'. This cbo is for a field named [client_id]. The AfterUpdate [event] of 'cbo_client' does a requery on a field in the the following SubForm:
In the SUBFORM_1(datasheet) (based on another Query) is another cbo named 'cbo_subclient', with a select statement of 'Select (all the needed fields) FROM tbl_subclient WHERE ((([tbl_subclient].[subclient_id])=[Forms]![mainform_1]![cbo_client])).
Everything (incl. the REQUERY) works fine, and all the tables gets updated with the records the way it should. No problems.
But this is where i get stuck...: Once the user has entered data in the SUBFORM_1 datasheet, and then >changes the 'cbo_client'< on the MAINFORM_1, it requery the subform like it should, BUT the previously entered data in the subform is already written to the table!
So, I need a way to prevent the data in the subform from beiing stored if the user changes the cbo on the mainform (for a second time). OR prevent the cbo on the mainform from beiing changed after the subform is completed.
I hope you understand what I'm trying to do...
Please, just a point in the right direction and i'll battle it out from there.
Thank you.
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Nov 27, 2006
I have a form that is opened by the following code:
Private Sub Status_AfterUpdate()
If Status.Value = "WIP - Snagged" Or Status.Value = "WIP - Suspended" Then
DoCmd.OpenForm "NotesJobChanged", , , acFormAdd
Forms!NotesJobChanged!txtJobNo.Value = Me!txtJobNo.Value
Forms!NotesJobChanged!Date.SetFocus
End If
This 'NotesJobChanged' form has three text boxes on it - JobNo, Date & Note. The JobNo is autofilled from the code above. If nothing is entered into the other fields and the form is closed this record is entered into the database with only the JobNo filled in.
What I want is a way to force the user to enter data into these fields. I don't want to set the 'Required' property of the field to yes as it generates an awful system error message. If the user attempts to close the form without filling it out can they be reminded that they have to, but with an option then to close the form if they really don't want to enter any data? If they do chose to close without filling it out can it be prevented from being added to the database.
Hope this makes sense :)
Many thanks in advance
Michael
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Oct 16, 2013
the proper code to prevent duplicate records in my form?
I'm using:
Private Sub Ctl_Lname_BeforeUpdate(Cancel As Integer)
Dim dupCount As Long
dupCount = DCount("*", "Clients", "[LastName]= '" & Me.[LastName] & "'" & " And " & "[PreferredName] = '" & Me.[PreferredName] & "'")
If dupCount <> 0 Then
Beep
MsgBox
[code]....
"This name already exists in the database. Please check that you are not entering a duplicate person before continuing.", vbOKOnly,
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Jan 27, 2014
I am trying to prevent a user entering duplicates of date and time in an appointments table for the same doctor..how do I do this?
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Mar 12, 2008
Is there a way to prevent Access from the absurd notion it needs to concatenate 'DBO_' as prefix to tables linked from SQL Server db? :mad:
Thanks.
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Jun 11, 2015
i have a table called tbl1. in this table i have field month, year, or trainee. is it possible that above mentioned three field found same data table automatically delte those rows. so i found only unique data. or their is another way to make this possible.
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Feb 6, 2008
Good morning! I'm building a database for use by four technicians in a call-center type operation. The call records are purely transactional in nature -- once the call has been logged, the record is closed. If the customer calls again, a new record is opened.
The supervisor doesn't want the techs to be able to go back and edit a record once it's entered -- the records are for quality-control purposes and he doesn't want them gaming the system by going back and changing things after the initial call is logged (let's not discuss the issue of employee psychology, motivation, Office Space, etc.). So I'm trying to figure out how to do that; they all have wheel mice, and I can currently see all the records as I scroll back and forward with my mouse wheel, so I'm assuming they'll be able to, as well.
Any help?
Thanks,
Andreas
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Aug 7, 2015
I need to create a form and report. I created a Form now (i want to Report too.) but i saw, some field records are repeating themself.
I give an example :
ID Group Project Name Maintainers
1 A X-File Top-Secret Saruman
1 B X-File Top-Secret Gandalf
1 C X-File Top-Secret Radagast
On my report or form i want to see only :
ID: "1"
Group: "A" , "B" , "C"
Project: "X-File"
Name: "Top Secret"
Maintainers: "Saruman" , "Gandalf" , "Radagast"
Is that possible to filter records like that ? and How ?
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Nov 12, 2013
Im trying to prevent duplicate records based on a PO # (RA_PO_Nbr), entered from a form. I'm trying to throw a 3022 error when the user attempts to enter a record that already exists, but I dont necessarily have to do it this way.
Code:
Private Sub cmdSubmit_Click()
On Error GoTo cmdSubmit_Click_Error
Dim db As Database
Dim rst As DAO.Recordset
Dim strSQL As String
strSQL = "CompanyPOTable"
[code]....
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Oct 14, 2011
We are a travel company and I am just setting up a new database with two tables - [Client_Table] & [Enquiry_Table].
Most exisiting clients call in when they want to make a new enquiry so the 'user' can go it to a form which creates a 'new enquiry' for that client.
We also download 'new enquiries' from our website. This data includes info that goes in to the [Client_Table] and [Enquiry_Table]. They download in to a XL spreadsheet. Currently I copy and paste the data (not sure if there's a better way) from the XL speadsheet in to a query. This query creates a new client record & a new enquiry record which are both linked by a primary key [Client_ID].
This all works however the problem I have is that sometimes existing clients enquire through the website. They do fill in a field to say they're an existing client but if I paste them in to the query as explained above it creates a duplicate client record.
The only way around this I can think of is it to take out any exisitng clients from the XL spreadsheet first, search for their Client_ID and then paste these enquiries seperately with their Client_Id's in to different query which only adds a new record to the [Enquiry_Table] and links them to their exisitng record in the [Client_Table].
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May 3, 2013
I have a table for storing vehicles. The table contains the following fields:
VehicleID
Make
Model
Trim
Build Date Begin
Build Date End
Vehicle Name - a concatenation of 'Make' 'Model' 'Trim' 'Build Date Begin' and 'Build Date End'
The 'Vehicle ID' is the primary key, the rest of the fields can't be indexed with no duplicates. Is there a way of preventing one from saving a duplicate VehicleName on the table since it is a calculated field.
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Nov 15, 2005
how or what function (DLookup) should I use to prevent duplicate records based on multiple fields? I want to look at data in three fields that can't match existing data in those three fields. It's ok if one or two of the fields match but not all three.
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Dec 12, 2012
I want to lock archive records so that they can't be edited, however I want them available to users for viewing. So for example if the file is "closed" the record can not be changed.
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Jun 14, 2013
Been experimenting on some code to prevent deletion or changes to records that meet certain conditions.
The problem I am having is the code is contradicting each other preventing some of the records to be locked down.
Code:
Private Sub Form_Current()
'Code 1 - Prevent edits if 21 day period has lapsed
If TestDate2(Me.txtStartedHidden) > 0 Then
MsgBox "Editing NOT allowed - 21 day time period has been reached"
Me.txtBasic.Locked = True
[Code] ....
Rules are:
Edits allowed if invoice date not reached
Edits allowed if within 21 day but NOT if invoice date is reached
Edits prevented if invoiced date reached and if records still within 21 days
Edits prevented if invoiced date reached & records past 21 days
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Dec 1, 2013
I have a table called tblDeliveryOverview and a table called tblPurchaseOverview in the relationship there is no link between each other but i've used a query to link the one field from tblDeliveryOverview to tblPurchaseOverview.
How can i prevent a record update from happening when i update a record in tbleDeliveryOverview and the same gets updated in tblPurchaseOverview, which i don't want to happen.
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Feb 6, 2014
Attached is my many to many relationship setup. I would like to prevent the possibility of entering the same person more than once for the same training event. I am assuming that I do this by setting an index setting for a field the junction table?
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Oct 30, 2014
I am creating essentially a contact database; however, I want to be able to upload new groups into the database from time to time. Some people in the groups may already be listed somewhere else. If I am using an ID number to identify each separate profile; how do I prevent a duplicate profile entry? Will I have to manually check each one? Also if I use the auto-number function, how do I tell access to create a new set of numbers that are different from ones previously assigned? I anticipate about 30 separate groups adding up to around 5,000 names. I don't really care to check that many manually.
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Dec 10, 2013
I have 5 tables and 2 forms. The primary form is what I input all the information into (Tracking) and the other form is to update employee information (update form).
The "Tracking" form is where I add information to 4 of the 5 tables. Here is where I'm stumbling. Would it be more practical to just have 1 table and just expand the fields, or have the form put the information into the separate tables. Those 4 tables are Employee, phone, spotter and radio.
I'm wanting to keep a running tally of who doesn't turn in what equipment on what day.
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