Tables :: Joint Table Primary Key
Sep 16, 2013
In a many-to-many relation, one create joint table and use two columns of both ID's in a Composite way. This what the text books recommend.I had a Form/subform to view the relation between the two table. I tried to add to the subform a new relation Access did not allow me to do it. I can go to the joint table in datasheet view and ADD to my heart content observing the unique condition.
If I change the design of the joint table to auto as PK and the two ID's with no PK in either, I can update from the subform .WHY the Composite Keys do not allow me to update the joint table by adding new records in the subform ???
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May 28, 2015
I have a table for a multiple parents linked to a child table. I need to figure out a way to only allow 1 parent to be coded as primary, 1 as secondary, and then the rest as other... I thought about making Primary/Secondary/Other a primary key. But then I can only have 1 other. I would have to make a finite number of parents that could be entered and I want an infinite number.... My end goal is to have a report that only has a primary and second parent on it, but the rest of the parents still exist in the table...
*Child_ID
Parent_First_Name
*Primary/Secondary/Other
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Aug 18, 2014
So, I have two Primary Keys in my table, how then do I link another tables to it?
tblAdmissions
PatientID Number Primary Key
Visits Number Primary Key
tblRoomPhoneNumbers
PhoneID AutoNumber Primary Key
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Apr 17, 2015
I got a product table that I want to link with Customer Table.
To relate one to many I have a IDCustomer on my product table that is about 1000 rows.
I can link and all is working.
But in the product table I need a Primary Key that is shorteer in rows (only 15 rows) and access won't let me create such a primary key because it contains null value.
I Need Product ID (as primary key) to relate to another table which I will name Product details.
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Oct 20, 2006
Hi, I have 7 tables in my database and 1 form corresponding to all the fields in these tables (linked by a query by recordsource). My problem is that the form will only show a record if ALL 7 tables have manually had the primary key entered (not good when i have information that needs to be added at different times). How can I make it such that if I create a new record on the form that all primary key fields will be updated, and this record will be present every time i open my the form??
Cheers
Tania :o
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Sep 22, 2007
Hi there,
I am trying to model my database to create relationships between different tables in my database. During the process of doing so I ended up having one primary key in table A linked with to foreign keys in two different tables ( table B & table C) and both of those two table are junction tables to break out many to many between many other tables
Now for some reason!!! I feel that there is something wrong with my logic mapping and modeling of the relationships between tables due the fact of having one primary key linked to two foreign keys in two different tables :(
Is my intuition is right? should such case be considered as indicative of wrong modeling of relationships between tables in a single database
And if so what is the disadvantages of that link (talking down the road) when the database if fully populated? :confused:
By the way I am new member and new to database, so please take it easy on me :o
Many thanks
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Oct 18, 2012
How to I combine 2 tables with the same primary key to make one table? I have seen several thigns but none have worked. I seen inner and outer joins. All 4 of my tables have the same primary key. I just want to combine all the tables to make one table. I have a form with subforms but if I can combine all the tables and work off one rather then 4 I will be happier. Every week to 2 weeks I upload new data from excel. How would I after I add the new data combine all tables to one super table?
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Aug 29, 2013
Right now, I have 4 related tables. There's a table with companies, one with people involved with companies, a table linking the two by having foreign keys of the company number and people names, and a table that indicates directors and their alternates.
Since there's a one-to-many relationship for companies/people to company-peopleID (A person can run multiple companies, a company has multiple directors, it's easier this way), a person's name can appear multiple times, as can a company, within that table.
In a company, a director may or may not have 1 and only 1 alternate director to him/herself. So, I thought the easiest way was to put an autonumber in the Company-personID table and have a table (alternates) that had two fields, "alternate" and "director", both using that autonumber to link them. However, it appears as though I can't link the same primary key twice to two foreign keys of the same table.
[URL]
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Nov 30, 2012
Access 2010..One organization that we work with provides us with a block of numbers for each of the two types of contract products we order from them; we do order non-contract stuff from them also.The block of numbers are the same (i.e. 20000 to 30000 this year) for each of the two products. This means that each product can have the number 20000, for example. We call this the Tracking Number. If it is one of these products, we need to select the Contract Number.
For all other one off orders we have with them, we assign our own Tracking Number starting with 00001. This Tracking Number cannot duplicate unless it is one of the aforementioned two products.Both the Tracking Number and Contract Number are in the same table. The user selects the Contract Number from a form (connected to the Contract Number table that has all the details on the contract) and the Contract Number is populated in the same table that has the Tracking Number.Each order must have a Tracking Number (no null)..Not all orders need a Contract Number (null okay).The Tracking Number and Contract Number combination cannot duplicate.I tried setting the primary keys to more than one field in the table, but they cannot have null values.
If not... I have been working on Plan B.... an AfterUpdate on the form (either the form or a field... don't know yet) that looks at a query that only has results if there are duplicate values.
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Oct 8, 2013
I am trying to create a one-to-many relationship between these two tables. I want to be able to access the 3 fields on the [Processors] table within reports based on [AllItems]. [AllItems] is a listing of account activity where the [AccountNumber] repeats. I have every field set as the "Primary Key" on [AllItems] as that is the only way to avoid importing duplicate data. I am getting the error: "no unique index found for the referenced field of the primary table"
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Aug 27, 2014
Working with two tables - tbl_A_OrdData & tbl_B_ShipData tbl_A have all the orders placed, but tbl_B only have the orders that got shipped. I'm trying to create a query that will show me all orders that got placed for a particular criteria and if the order find a match in tbl_B to give me the ship date too. A left joint query get me the data I need. But my dates are in YYYYMMDD number format so in the query I am putting the DateValue function. And that error out as "data type mismatch" because it cannot find the shipdate for certain records. I tried this but didnt work. ShipDt: IIf (IsNull ([PSHPDT]), "", DateValue(Mid([PSHPDT],5,2) & "/" & Right([PSHPDT],2) & "/" & Left([PSHPDT],4)))
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May 1, 2014
i have 4 supplier tables with identical field names but different databases in sql.I want to have them all in one table and only want the information for reference i do not want to edit any of the data.I need to create a new primary key number for the complete table. The data will need to be refreshed as the data comes from MMS Sage looking at company PLsuppliers.
I have tried a linked SQL union view- but this has no primary key.I need to keep the Primary key consistent as the data saved in other tables will use this field.The overall goal is creating a Purchase order system and this list will be my complete supplier list.
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Feb 1, 2008
Hi,
I need to create a table with 2 sets of different information both referring to job types. the problem is that i need the autonumber which created the job number to scale together. so both tables have a primary key of "job number" and i want the autonumber to only ever use 1 number in both tables.
e.g.
job type 1 - autonumbers - 1,2,3,4,6,7,9,10
job type 2 - autonumbers - 5,8,11,12
is there anyway of achieving this?
Any help greatly appreciated
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Aug 20, 2013
I have mapped everything out and built it in Access (but haven't entered any data yet). My question relates to structure. The data is based on artifacts, each piece is recorded with an automatically generated primary key in the main table. There are a number of features (type, decoration etc.) that are documented in related tables (included in/linked to the main table with foreign keys). Aside from these (the features I will query on), each piece has a number of characteristics to be recorded (size, colour etc.). Because of form/table size, I have broken the information into three tables (a main table with ID details, a second with Sizing and Dimensions, and a third with Materials etc.).
My question is: Can the main ID primary key from the main ID table also be used as the primary key in the 2 other basic information tables, with these 2 linked to the main table in one-to-one relationships (so it's an auto-number in the main table and an integer in the other two). This to me would be much easier to navigate than to have one long giant table with all these basic details.
I have created a main data entry form with a "navigation form". 5 tabs/pages. Tab/Page 1 = main ID. 2 and 3 are the two broken apart tables mentioned above. 4 and 5 are forms based on related tables that have their own subforms included. Both 4 and 5 are based on tables in which the main ID primary key is entered as a foreign key (in one-to-many relationships with the main table). Since this was done with a navigation form (instead of adding each of the 4 as subforms), will it still allow me to enter all relevant details for one piece into each tab/page, and save it all together automatically (whenever I enter a new piece into the main ID form)? Will the primary key be automatically generated throughout, or do I have to enter it manually in each tab/page?
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Mar 13, 2014
My Access 2010 skill level is intermediate.I have a table with 4 fields.
EmployeeID (Primary Key)
LastName
FirstName
SupervisorID
The problem I have is that in the Supervisor field, it identifies the supervisor by his/her EmployeeID. I would like to create a query or merge tables so that the SupervisorID can look for a matching value in the EmployeeID field and return the last name/first name.
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Aug 28, 2013
I am importing data from excel and I want to put a primary key on a column but it doesnt let me saying "primary key cant contain a Null value", coz I have a "NO" or "O" value. But i dont understand why is it a problem as I have specified the field as text not number.Also is it necessary for the table to have a key ?
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Jun 2, 2013
Composite Primary Key in Ms Access 2010. I shall try and explain my tables in detail. So my first table is "Client Database" where the field "Buyer" is primary key. This is connected to my next table "Project Database" which has fields such as Work Order #, PO #, PO Date , Buyer etc where Work Order # is the primary key. Finally "Projects Database" is connected to Order information. Now the problem is until now, I always had 1 PO # for each Work Order #. However now I am facing a situation where my client has clubbed multiple PO #'s for the same Work Order #. I need to trigger the Primary Key Violation only if both the Work Order # and the PO # are the same.
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Aug 1, 2005
I have constructed a DB for work to record accidents, however I am running into problems. On each form I have a button that Saves the data closes the current form and opens the next form, depending on what data was entered. I have this ruuning fine using this code,
Private Sub SaveRecord_Click()
Dim NextForm As String
If Me.Status = "Pupil / Child" Then
NextForm = "StudentDetail"
Else
NextForm = "EmployerDetails"
End If
DoCmd.save
DoCmd.Close
DoCmd.OpenForm NextForm
End Sub
Private Sub SaveRecord_DblClick(Cancel As Integer)
Dim NextForm As String
If Me.Status = "Pupil / Child" Then
NextForm = "StudentDetail"
Else
NextForm = "EmployerDetails"
End If
DoCmd.save
DoCmd.Close
DoCmd.OpenForm NextForm
End Sub
The primary key of this form is "PersonKey" and the two forms taht could open, each have"PErsonKey" as a foriegn key. However the key does not get brought across into the next form and the save function does not appear to work on all forms... :confused:
I put another button on this form using the control button wizard, and it gave me this code,
Private Sub Command23_Click()
On Error GoTo Err_Command23_Click
DoCmd.DoMenuItem acFormBar, acRecordsMenu, acSaveRecord, , acMenuVer70
Exit_Command23_Click:
Exit Sub
Err_Command23_Click:
MsgBox Err.Description
Resume Exit_Command23_Click
End Sub
However when I run this from the form, it tells me that the "PersonKey" field needs a value.... :confused:
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Mar 13, 2006
I have three tables.
EAch has a field called ID that is an Autonumber that is the primary key.
When I enter data via a form each record has a different ID across the three tables.
Does this mean they are not linking up correctly?
I have attached my databaset if that helps.
Thanks.
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Jun 15, 2006
Hi guys,
I am having problem with a query.
I have to tables. One named wire and the other named Input.
As my title says there is not unique ID for the tables to relate.. the only thing to relate is one ID where is not unique for all the rows
In the Wire Table I have 3 rows using the same ID, lets say 123.
In the Input Table I have 1 row using the same ID as above, i.e. 123
I need to select a couple of fields from Wire Table and 1 field from Input Table
The only relationship I have is the ID 123.... since the ID in Wire Table is repeated in 3 rows.... I would like to use the same value from the Input Table to be the same for the 3 rows in the other table.. Below is an example:
Wire Table:
ID Group
123 A
123 B
123 C
Input Table
ID Description
123 Analog
My wanted result would be
Group Description
A Analog
B Analog
C Analog
I tried using the Left join or Join function, but somehow the resulting table has many duplicates of the rows...such as:
Group Description
A Analog
A Analog
A Analog
A Analog
A Analog
B Analog
B Analog
B Analog
B Analog
...
Any Idea on whats going on and how can i solve this problem????
Thanks in advance. Your Help is much appreciated
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Jun 25, 2013
I have just inherited a database that currently has no primary key set up. I wanted to add a two part primary key, but have run into a couple problems. The purpose of the database is to keep track of parts that have come back for repair. I wanted to set the key up to be a combination of the call number and the part serial number. I should always have a serial number, but the serial number can be in the table more than once, as it could have needed repaired more than once. I will normally have a call number for each record.
However, the call number could be repeated more than once, if more than one part came in on the call. The combination between call number and serial number should always be unique (each time a part comes in, it should be on a different call). My problem is arising, when a part is just pulled off the shelf of the factory and sent in for an upgrade. In a case like that, there is no call number. However, a serial number will never come in more than once without a call number.
So the combination of call number and serial number should still remain unique. When I try to set this up in the database, it tells me that the primary key cannot contain a null value (referring to the times that a serial number comes in without a call number). I want to get this set up so that the people entering data in the database will not be able to enter the call number, serial number combination more than once. How can I do this if one part of the primary key can be null?
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Sep 24, 2012
I have two tables tblPatients (pkUMRN) and tblAdmissions (pkAdmissionID, fkUMRNAdmission). pkUMRN is not auto-number, but is an 8-digit alphanumeric code unique to each tblPatients record. I have set up a one-to-many relationship between tblPatients_pkUMRN and tblAdmissions_fkUMRNAdmissions (each patient can have multiple admissions).
Is it possible to allow the entry of a new tblAdmissions_fkUMRNAdmissions to create a new tblPatients_pkUMRN? IE can you create a new primary key from a new foreign key?
Along a similar line, if the primary key already exists, how would you autofill a form with data from tblPatients when the tblAdmissions_fkUMRNAdmissions is entered in to the table?
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Dec 12, 2012
I'm using Microsoft Access 2007
I have three tables: the 1st is for product's identification, the 2nd is for registered products, and the 3rd is for under-registration products
and the primary key for the three tables is the Registration Number
and there is a one to one relationship between the product identification and the registered products
and a one to one relationship between the product identification and the under registration products
What I want to do is to make an append query to move the under registration product to the registered product when its process is over.
One of my problems is with the primary key for the under registration products table, as they only get their registration number when the process is over. so how can I enter data into this table without the value of the primary key ?
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May 17, 2007
I am creating a bridge table to get rid of redundant data. I am doing it by making a composite of the primary keys from the two tables I am bridging.
The error message when I get to a certain point is "You cannot add or change a record because a related record is required in table tblMachCent." Both the numbers I am using to create this composite key are in the tables necessary, so I am not sure why I am getting this problem. Any suggestions??
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Jun 19, 2013
When I first was making my database I used all auto numbers for PK's. But then I read an article or two saying that you really don't need to do that if you don't have to (actually, the article said "don't use autonumber if you want anyone to understand your database). I have a few tables (most employee experience type tables) where I just use the word as the PK and there is no auto number in the table at all.I continue to build my database?
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Jun 23, 2013
Is there a way I can format AutoNumber for a primary key, for example, have the first ID start as C001 then for the next entry Access will automatically go to C002, and so on and so forth?
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