Junction Tables Has Composite Key With Two Fields
Jun 17, 2015
I have an events table and a junction table that has a composite key with two fields; those are the only fields on the junction table and are FKs in my events table.
I have a form that fills in events to my events table and also fills in values to my junction table. The control source is a query of the two tables along with a couple of other reference tables for metadata associations. The form works fine... the first time. My problem is that, after I have entered an event that has my unique composite key for the first time (thereby entering a new record to my junction table), once I go to enter a second event that uses the same key, access tries to enter the record again and throwing a "3164: field cannot be updated" error instead of referencing the already created composite key.
I have the form set the composite values to the selected values on form load. Normally, I would just set the primary key to the primary key values and access would follow my logic, but in this case it always tries to make a new record.
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Jun 24, 2014
Is there an easy way to auto-populate a Junction table [in access 2010] given the following two tables with a many-to-many relationship for Tasks? The two tables are
Table 1) tblTasks (TaskID (PK), Description), and
Table 2) tblMeasures (MeasureID (PK), Description, Tasks)
If JCTN table is JCTN_Tasks_Measures (TaskID, MeasureID), is there a way to populate when tblTasks(TaskID) == tblMeasures (Tasks)?
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Mar 2, 2005
Hi, can anyone explain to me in simple terms how junction tables work and how i would go about creating one?
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Oct 11, 2005
I have created a junction table in my database.the tables being linked are tblplayerInfo to tblGuardianInfo. The junction table containd the PK of both these tables.
A player can have more than one guardian (Mum,Dad, etc) and a Guardian can have more than one player (two sons, etc)
On my form i display both sets of info. The player info in the main form and the guardian info in a subform.
I want to be able to add a new guardian to a player.
How do I update the junction table to reflect the new guardian addition, or does Access automatically create the record in the Junction Table (if so How)
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Sep 27, 2007
I would like to create a database of organizations in my area that provide particular services. I had initially created an Excel spreadsheet, but decided that I'll probably need an Access database, so I converted the format.
I have one table that has the name of the organization, contact information, hours, and other info. In the original Excel spreadsheet, I used strings in two other columns for "languages" and "areas served". Some organizations offer services in more than one language and some operate in more than one geographical area. I've read posts, some books, and info on other sites and it looks like I'll need to use two many-to-many junction tables (one for each of the two remaining columns described above).
So, what I have done so far, is this:
Table: "Resources"
ResourcesID (AutoNumber)
Organization/Program (Memo)
Address (Memo)
...
Table: "Areas"
AreasID (AutoNumber)
Description (Text)
Table: "Languages"
LanguagesID (AutoNumber)
Description (Text)
JUNCTION Tables:
Table: Resources_Areas
Resources_AreasID (AutoNumber, PK)
ResourcesID (Number)
AreasID (Number)
Table: Resources_Languages
Resources_LanguagesID (AutoNumber, PK)
ResourcesID (Number)
LanguagesID (Number)
I have several questions, and I hope that I'm asking the right ones.
First, my junction tables, when I initially set them up have no information in them when I just open them (when I don't use the Design view) -- they just show the column headings. Is this right?
Also, when setting up the relationships, do I need to check the "Enforce Referential Integrity" box? And if so, it seems like I need to change the "Indexed" property for the PK's of all three of the main tables (not the junction tables) to "Yes (No Duplicates)" -- right?
My main problem is that I don't understand now how to assign multiple languages or multiple areas served to each record in the Resources table. Originally, as I explained above, I had these as strings in a particular cell in Excel (like, "English, Spanish, French"). Will I be deleting those two columns from the Resources table?
I can provide what I've got so far if that would help... and I would greatly appreciate any assistance (explanation, link to good tutorial, example databases, etc.). Thank you so much,
Matt
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Jan 5, 2008
I'm at a place in my design where I don't want to go further without advice for fear of really making a mess.:o
I have Products, Customers, Customer Locations, and Customer Models that can have any number of combinations. I've joined what I think makes sense at the lowest level, customers with locations, and next model with customers/locations.
I think products is the outer most junction, because many customers can use the same product in any number of models and locations.
The attached diagram shows where I am now--multiple junction tables, and junctions of junction tables. Now each of these tables has other relationships to nomalize things, but those are not shown.
Is one more level, or nest if you will, the right way to do this?
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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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Oct 3, 2007
Hi,
I am trying to join 2 tables with composite keys - each of them have the same 4 columns as part of its key - date/person/problem/date sent.
Table 1 has 5 columns (4 key columns + 1), Table 2 has the same 5 columns plus 1 additional column (Comments).
I am trying to match the Comments column in Table 2 to Table 1 and show the output in another table.
Currently, I've related the 4 columns in each table to each other, each relationship defined as including all records from Table 1 and only the records from Table 2 where the fields are equal.
In the fields, I have 5 Columns from Table 1 and the last column (Comments) from Table 2. When I run the query, I get all the records from Table 1, but not all of the Comments that match from Table 2 are shown.
Any Ideas on how to improve this link?
Thanks!!!
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Nov 20, 2004
Hi, I have the following structure:
Products 1-M ORDER DETAILS M-1 ORDERS M-1 CUSTOMERS
I have ORDER DETAILS set as a junction table so that many products can be recorded within one order. All is good apart from when i go into ORDERS and create a new order. I click the subform which links to the ORDERDETAILS. I then pick a product number(look up from products table). The problem is this: In the ORDER DETAILS I want to display the unit price of this product simply by picking the product id.
Eventually this would form the basis of an order form where I can pick Product Id and have it display unit price.
Any ideas on this one, I'm sure its quite simple!!
Thanks in advance
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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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Dec 8, 2013
I explain , I have 5 tables :
Class ( classID , classname,... )
Student (studid , firstname, lastname , classID ,....)
Course( courseid , coursename )
Term ( termid , termname , begindate , enddate )
Score ( scoreid , studid , courseid , termid , score)
Note :
1) A class can contain one or more students (one-to-many between Class and Student tables)
The table "Score" is a junction table between three tables : Student , Course and Term because it contains three foreign keys ( I could use a combination of 3 foreign keys to make a primary key ! ) .
The tables ; "Class", "Student", " Course ", "Term " already contain data for each table I created a data entry form .
My biggest problem is how to create a form to enter students' grades or scores for each student that belong to his class.
I do not know how to do it especially since the idea is that :
On a form I would like to use ComboBox to select a class that displays student's list from class selected and a ComboBox in same form to select course and another ComboBox to select a term and then enter grades or scores for each student
This is my general idea to enter students' grades. The rules are :
A class contains one or more students
Each student takes one or more subjects.
Each student gets scores for each subject and each term(quarter)
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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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Oct 17, 2014
My table key looks like this. Its a table that keeps a master record of conferences that occur during a calendar year
ConfYear (Date/Time) primary key
ConfNo (Byte) primary key
As you see its a composite key. Now each time a new record is created i want the ConfNo to autoincrement within its ConfYear. I used a byte as its not usually more than 4. Autonumber does not work as part of a composite key i found out.
2014 1
2014 2
2014 3 etc
And revert to 1 when ConfYear input changes to 2015
Is there a simple way to do this with say, a macro, or is the only way with VBA and DAO?
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Feb 26, 2015
I am creating a database that tracks the selling of products amongst other things.
The user will enter in an order and may delay invoicing until the customer approves the quote - at which time the order is turned into an invoice.
In the transactions table the OrderID, ProductID and CustomerID constitute a composite key.
I want to be able to view the order and change it by either deleting or adding ordered items (obviously prior to invoicing) but because the ProductID is part of the composite key I cannot delete a line item.
Perhaps the solution is to remove ProductID from the index or is there a better way?
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Sep 26, 2013
So I have a form that has a sub form on it (based off of a junction table), indicating which category a particular project belongs to. It can belong to multiple categories:
ProjectID
100
Category
Admin
Finance
But I want to run a query to find all of the projects that are both admin and finance. When I do that now, it comes up as two separate records in the query, which is fine... but I have to know the projects before hand to find if it's in both, because it returns heaps of records, anything that says admin or finance... and that defeats the whole purpose. I want the query to show me JUST the projects that have both of those in their subform..
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May 29, 2005
I am trying to set up a Real Estate database, and can't get the Relationships to work. I have three tables:
House Listings
Farm Listings
Clients
Clients can have properties in both House and Farm Listings Tables, so I need a Junction Table (or do I need more than one?)
The Primary Key fields of House Listings Table (HouseID) and Farm Listings Table (FarmID), become a composite Primary key in the Junction table. Is this correct?
Both the House Listings Table and the Farm Listings Tables have a field for Client ID. Is this causing me problems, as I can get the Farm and Clients Queries to work, but not any queries with the House Listings.
As this is my first attempt at creating a database with many-to-many relationships, please explain in simple terms what I am doing wrong.
I would appreciate any help.
Thanks
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Jan 23, 2006
hello
how can i create compostie keys in access???
also how would validation rule for a text box which would allow a user to enter a date which between a certain range in relation to today's date. eg the date entered cannot be more than one week greater than the current date. i knew who i could do it using VBA but i want to know how to do to using the regular access features.
thanks you :)
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Mar 10, 2007
Hi, I am in a great hurry and I need someone to help me as soon as possible. Basically, I have a table called Column, which contains 4 fields:
Column (autonumber, primary key)
Column Description (text)
Rack (number)
Rack Description (text)
There are around 30 columns, and each column has 3 racks. There are different racks for different columns, so the rack description will be different. That is why Rack and Rack Description must be in the same table as column.
The problem is that I cannot make the table have one column with three different racks. I thought perhaps the solution would be to make a composite key, where with Column and Rack, we would be able to identify everything else in the table. But the problem is that I do not know how to create this composite key. Please help me with this. I really need to get this done as soon as possible.
Thanx in advance
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Mar 5, 2007
16593
I have attached the above relationship diagram as I am having a few problems with a table that uses composite keys to link to 2 other tables. The table is called subsmag and contains the fields subid and magid to link to the subscriptions (subid) and magazine (magid) tables. Basically 1 subscription can have many magazines and I am using the subsmag table to link the 2 tables. When I try to enter data in a form it doesn't like the composite key. Can anyone help, I have inherited the database design and I'm thinking it needs a redesign.
thanks
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Aug 10, 2007
Is it best to have one PK in a table and that as an autonumber?
If so, why do people create composite PK's. Examples please.
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Apr 13, 2007
I'm working in the petro-chem and industrial service industries now, and am finding there are relationships I haven't had much exposure to in the past.
Can someone please help me with constructing the tables and relationships needed here?
This is something I should probably know, yet I've never created junction tables which must take into account nested data. I have created a relationship which works, but I feel it could be done in a simpler fashion.
By the way, I cannot find Pat Hartman's many-to-many sample db. It is either missing, or the restrictions on word length in Search just aren't letting me find it.
Table: WorkOrder is the primary table I'm working with. I need to store 4
pieces of information for every WorkOrderID, two of which have subs.
Here's a picture of the data I need to collect:
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Apr 24, 2006
I’m having trouble defining Relationships I’m thinking I need a “Junction” Table and I have tried looking at the Orders.mdb but it hasn’t helped (I’m sure I’m just missing something) I just don’t see how it works. If at all possible please don’t just give the info try to help me understand so I can get the answer myself.
Here is what I have:
Far table:
FarNumID (PK) > autonumber
FarNumber > Text “224-10C”
FarTitle> Text
FarParagraph table:
FarParaID (PK) > autonumber
FarNumID > Number
FarParaTitle > Text
FarParaText > Text
AC table:
ACNumID (PK) > autonumber
ACNumber > Text
ACTitle> Text
ACParagraph table:
ACParaID (PK) > autonumber
ACNumID > Number
ACParaTitle > Text
ACParaText > Text
1. Each FarNumber can have only 1 FarTitle 1:1
Each FarNumber can have many FarParaTitles 1:Many
Each FarNumber can have many FarParaText 1:Many
2. Each FarTitle can have many FarParaTitle 1:Many
Each FarTitle can have many FarParaText 1:Many
3. Each FarParaTitle and have only 1 FarparaText 1:1
Thanks so much.
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Dec 8, 2005
All I ever seem to do is sit about trying to figure this out and then give up and ask for help :(
I have three tables.
One for contacts
One for groups (groups like people attending meeting a, b c)
and a junction table as the top two create a many to many relationship.. one person can be part of multiple groups, and a group can have multiple members.
In the contacts table my primary key is an auto number, and is contactsID
I also have some contact details, and a groupID field
In the group table my primary key is GroupID and is an auto number,
it also have group name, and description
in the junction table I have a primary key, then GroupID, and ContactsID which are also set at primary keys and are set with the same values as the same named primary keys in the relavant tables (I beleive this defines them as foreign keys... i hope so anyway!)
I have the relationships set up as a one to may relationship from contacts to junction and groups to junction, contacts linking from ContactID to ContactID in each table, likewise with the Group table.
However, when I try to put everything into a main form for contacts,with a subform for groups, all I am getting is the autonumber... which isn't much good for my end user..... :( How do I solve this?
Thanks anyone that can help.......
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Dec 9, 2004
Before I start, I know there is much about "Cascading Combos" in the forums, but I'd rather not go that way.
I have a table of Servers (only field is Server ID) and a table of Domains (Server ID, Domain ID). This is one-to-many, as each server will have multiple domains within it.
I also have a table of Applications which has as part of its primary key Server ID and Domain ID (i.e. that's where the app is installed).
I have used the Lookup tab in table design to easily provide a drop-down list of Server IDs for any new Application record, coming straight from the Servers table.
I want to (simply) add a drop down to the Domain ID field to select Domain IDs that are defined *for the entered Server ID*.
I already have the referential integrity enforced, but would like this simple aid as there are heaps of Servers and lots of similarly named Domains. It's looking to me like this is not possible, as the nub of the issue is how to qualify the Server ID field in the new record i.e.
SELECT [Domain ID] FROM Domains WHERE Domains.[Server ID] = <current record>.[Server ID]
How to define <current record>?
I know some will say forms are the tool for this job, but I need to see lots of records at once as I am entering (or changing) data.
I may be hoping against hope that this lookup capability can cope with a simple composite key.
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Dec 5, 2005
I have recently started a new project, on one of my tables i have a composite key for my primary key. However when i create a relationship using one of the fields in the primary key i can't "enforce referential integrity". Every time i try i get the message "No unique index found for the referenced field of the primary field"
can any one help
Mindy
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Oct 6, 2007
Many to Many
I have a basic question, I know for a fact that all many to many relationships have to be broken into two one to many relationships using a junction table. However does that mean it is (a must )to have the two foreign key of the parent tables have to be the (primary composite key) of the junction table.
For example, let’s say I have 5 tables that I need to establish many to many relationships between them. Is it correct to establish a junction table with all 5 foreign keys of the parent tables as composite primary key in the junction table to!
Hope the above making sense!!! :confused:
Many thanks :)
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