Table With Two Foreign Keys?
Oct 5, 2015Can a table have two foreign keys?
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Two Foreign Keys In One Table.
Apr 20, 2006I'm not new to access, and I understand normalization at pretty much all its levels, but right now I'm curious about a situation that I have just come across. The first time I've been in something like this, so I thought I would ask.
This is the setup.
I have employees. They are apart of a shift and a budget. Shifts and budgets are completely independent of each other.
The database needs to keep track of shifts and budgets over time. Therefore, 1 to many relationship to shift table and budget table.
But, the database also needs to keep track of attendance. And the user wants attendance tracked by Shift and Budget.
Shift and budget are completely independent of each other.
Currently, I have the relationships set up like this.
Employee (1) ---(Many) Budget (1)------(Many) Attendance
Employee (1) ---(Many) Shift (1)--------(Many) Attendance
When a new attendance record needs to be added, both the key to the budget and shift are added to the attendance table. The key chosen is dependant onthe Employee chosen, and whether the budget and shift are the CURRENT budget and shift that the employee is apart of.
I thought of running a query showing budget and shift by date descending, so that the latest budget / shift would be displayed, and thus the most current (SUPPOSEDLY) But, if a user put in a different date, or screwed up on the date, then the incorrect shift and/or budget would be displayed.
Date stamping an entry was an option, but there needed to also be a user entered date as well, to specify WHEN a user began working in that specific budget / shift. Therefore two date entries would be required. Duplicate entries in most cases.
I therefore decided to go with a true/false yes/no checkbox. Where the current budget or shift would be checked, and all non current ones would be unchecked (false).
Currently, this is how the systems works. And it works well. But it is dependent on some form code I created to set the yes/no checkbox to true/false depending on the situation.
I DON"T like doing this. Am I missing a way to do this "correctly" where by Access would do this "automagically" instead of via my trick.
The ONLY issue really, is that when a new attendance incident occurs, the user needs to put in the incident to the approbriate shift / budget. And if the current shift / budget could automatically be displayed without user intervention (IE user has to pick the shift / budget from drop down box after looking up info etc etc) since the current information SHOULD be known.
I've never done a table setup where two foreign keys are the many side of the relationship in a single table.
It is currently working fine, and seems to do well, but I wanted to make sure with others who might have had this experience. And also, any "advice" / "cautions" for this kind of situation so I don't step into it deep and have to fix it later.
One Primary Key In One Table Linked To Two Foreign Keys In Two Different Tables!!!
Sep 22, 2007Hi 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
Tables :: One Primary Key To Multiple Foreign Keys In The Same Table?
Aug 29, 2013Right 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]
Forms :: Primary Key As Multiple Foreign Keys In Single Table
Mar 26, 2013I'm developing a simple sporting records db. I have a 'Competitor' table listing competitors as follows: CompetitorPK, Name, Division, Club. I have a 'Contest' table listing contests as follows: ContestPK, Competitor1_FK, Competitor2_FK, Winner_FK, Score etc. My question is have I modelled tables correctly i.e. CompetitorPK will appear in three columns of Contest table. How do I define this relationship? What alternative is there to what I have done.I intend to use forms to populate both tables (independantly obviously).
View 4 Replies View RelatedForeign Keys
Aug 25, 2006Hi,
While designing a database, I came up with 3 different foreign keys in one table. I am afraid this is not right!
Is it possible to have this number of FK in one table or does that suggest a design flaw?
Any help will be very much appreciated.
B
Redundant Foreign Keys?
Jul 8, 2005More on the lot materials management program.
I have a series of related table:
Builder
Subdivision
Lot Number
Lot Option
Lot Materials Details
The [Lot Materials Details] table is populated by appending data from the [House Type Details] table tree as follows:
Builder
House Type
Elevation
Options Per Elevation
House Type Materials Details
The filtered Option Table in both branches determine which [House Type Materials Details] records get appended to the [Lot Materials Details] table.
The question is:
Is there any advantage, other than simpler queries later on, to adding the primary key from the [House Type Materials Details] table to the [Lot Materials Details] table.
It’s redundant because the [Lot Options Table] contains the [Options Per Elevation] primary key.
Any thoughts?
Foreign Keys And Tables
Sep 25, 2006hi
i need to create a table, i've figured out to make LastName the primary key. But im not so sure about the foreign key, and whether it is necessary to put it into the table in order for all my tables to relate? Sorry if this doesn't make much sense.
Also, to clarify.. 3NF primary keys in one table cannot be used in another table??
thanks
Two Foreign Keys In One Tbl Link To Same Tbl
Aug 5, 2007Wow, I've found some good stuff here already... Thanks.
PROBLEM:
I have a table(we'll call it shipping) that has two columns FK'ed to another table (locations). My problem is I have no idea how to pull the information from the locations table into the shipping table.
DESCRIPTION:
My shipping table has a source and a destination column. Now, I have a fixed location list that applies to both columns and I'd like to avoid having a source tbl and a destination tbl... I'm an Access Neophyte to say the least (for now at least) but I have managed to put together a querie that pulls out most of the information that I need (name, phone number, yadda, yadda, yadda) but I can't seem to correctly link the FK's for the sources to the locations table as well as the FK's for the destinations to the locations table. When I run my querie I get an error or my Source(destination) column will display the correct information but the Destination(source) column will display ALL of the locations in the location table. Here's what I mean:
Source destination
detroit toledo
detroit cleveland
detroit San Diego
detroit London
detroit Paris
detroit detroit
Paris toledo
Paris cleveland
Paris San Diego
Paris London
Paris Paris
Paris detroit
.
.
.
The first and second source was detroit and Paris but the Destinations list all of the locations I have in the table.
How can I link two FK's in one table to another table in a querie?
Thanks.
Foreign Keys In Access 2007
Jun 14, 2007Hi,
I have to create a database for work and for my sins I have to use Access. We are running 2007 but I'm having some difficulty in creating foreign keys in my linking table.
I've searched their help guide and looked on the net but I can't seem to see how I physically create foreign keys.
My structure looks like this:
Customer
CustID (autonumber)
Cust Name
Cust contact
Cust email
cust version
no of users
other info
Modules
ModID (autonumber)
Module name
licensed module? (tick box)
MiscSoftware
MiscID (autonumber)
Software
Installed on live
CustMod
ID
CustID
ModID
MiscID
Thanks
ComboBox Filter With Foreign Keys?
May 30, 2012I want to create a combo box filter - easy enough usually
However - the field I want to use is a foreign key field which, while it displays a meaninful description - it stores the id rather than the text
I want to create a combobox filter, but when I do all I see is the id's - which are meaningless to the user.
Is there a way to get these foreign key filters to display a meaningful text description??
Tables :: Inserting Foreign Keys Within A Text Field?
Aug 28, 2013I've got a table - "Products" - in my database, with a text field - "Info" - which contains info about products.
Within this field I would like to have footnotes. To do this, I think the best way to do it is by putting numbers inside the text at the location of where I want the footnote to refer to. These numbers will actually be foreign keys to a table called 'Footnotes'.
I can then program the forms and reports to show any numbers as superscripts or whatever.
(Of course, if the user will actually want to insert a number into the text field which is NOT a reference to a footnote, I will have to make a workaround e.g. by making access put a symbol in front of the number, so access will know the number is just part of the text (and I will program the form to not show the symbol in front of the number)).
Is it wrong to have foreign keys within a text field? I think if executed correctly, it should work perfectly.
Queries :: Importing Data Where Foreign Keys Are Involved
Jul 10, 2014I have what I think is a normalised database that uses foreign keys quite a bit.
For example if I had a 'contracts' table which refers to 'clients', then there would be a tblClients, where each client has a primary key. The tblContracts would then refer to the relevant client via that clients FK only which would be linked to the client's PK in tblClients via a one-to-many relationship.
If I need any user for any purpose to see contract related information that makes sense to a human being, I simply construct a query with the necessary relationships that will show client information alongside contract information by substituting tblContracts' client FK with required information from tblClients via the appropriate relationships.
I think that is reasonably basic stuff (hopefully correct practice!)
But what about when I come to import a block of new data that needs to go into tblContracts? I'm not going to be given a list of client keys (obviously) I'm going to given their real names.
MS Access has (in theory) all the information it needs (via the relationships) to substitute client IDs (keys) for their real names and thus slot these IDs into tblContracts with the new data as appropriate, but how do I make it do this? (I know it could kick out errors if there are any duplicate client names, but let's put that to one side for a moment).
One Primary Key + Multiple Foreign Keys...help Creating Form With Option
May 4, 2006I need some help creating a simple datebase to store my documents and other knowledge objects. There are two types of
knowledge objects I need to store: Documents and Questions/Answers. For this reason I have created three tables: Index,
Question, and Document.
The problems I am encountering is that the ID field in the Index Table is the Primary and relates to the ID field in the
other two tables. So basically when I am entering information it can either be a question or document. I want to create a
for so that when its a question that I am entering it records the information in the question table and when its a document
I am entering it records the information in the document table.
I'm a beginner at using access and don't know VB or SQL. Any help would be appreciated.
Table Structure
Index Table
ID (Primary Key)
Link
Type
Source
Reference
Question Table
ID (Foreign Key)
Question
Answer
Document Table
ID (Foreign Key)
Title
Summary
Notes
Forms :: How Data Is Passed Using Foreign Keys - Cannot Display Proper Information
Jan 25, 2015I'm trying to understand how data is passed using foreign keys.
I'm using Allen Browne's 'Don't use Yes/No fields to store preferences' at: [URL] ....
I've also downloaded his sample DB, RelationBasics, to use as a guide.
Attached is my version of the Student / Sport DB as described on the webpage.
I use 2010 at home (saved as 2003 version) and 2003 at work (JPNSE OS). Both result in the same thing.
The problem I'm having is I cannot get the actual sports to display in the combo-box, only the Sport_ID number.
I've tried building both forms with and without actual data in the TBL_Student & TBL_Sports tables, but no mater what the result is the same.
General :: Access 2007 / Finding A Related Record That Has 2 Foreign Keys?
Jan 22, 2013I am using access 2007
i have a materialsUsed tbl that list all the materials used in a job and the quantity of each.
(ID
Material Code
Quantity
Unit of Measure)
I also have 2 look-up tables - 1 for the material codes and 1 for the units of measure
I have another table, priceperunitofMeasure
id
material Code (FK to material lookup tbl)
Unit of Measure (FK to unit of measure tbl)
Price
In my form Users will select material code from combo box - enter the quantity, and select a unit of measure from a combo box.
For example: they could enter the following :
Paint 2 gallons
Paint 3 tubes
Paint 1 pint
How do I lookup the price per unit of measure for each of these records in the price per unit of meassure table? The price per unit of measure table has 2 foreign keys.
Tables :: Multiple Parents Table Linked To Child Table - Primary Keys
May 28, 2015I 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
Using Foreign Key To Get Related Values From One Table Onto Another Table?
Sep 25, 2013I created 2 table that are linked to a link table so to get a many to many relationship.I have a table for locations and a table for parts.One location can have many parts and One part can belong to many locations, that is way the many to many relationship.
how to get values from the parts table to the Location table using the linked Primary Key in the foreign key linked field.The values also have to be interactive, if I change the value in the part table it needs to update in the location table.
What can I put in the field of the location table to get a specific value from the parts table?
I tried setting the field to calculated field and put the Dlookup function but that didn't work. The lookup wizard seems to be the solution, but I can only create combobox or list box and I need to select the value manually. I just need a value to be put automatically by looking at the foreign key.
If I put the Dlookup function on the default value, those it update if a value is changed in the part table?
Possible For Primary Key Of One Table To Act As Foreign Key In Another Table For More Than One Columns?
Nov 7, 2012Is it possible for the primary key of one table to act as the foreign key in another table for more than one columns? What I'm trying to do is create a table for a Committee which will have 1 student and 5 professors! So Can I import the faculty ID for each of the 5 faculty members?When I try creating the second relationship, access automatically creates a new Faculty table for the relationship!
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Oct 2, 2014How would one link a replication ID as a foreign key within a different table as they aren't numbers and not quite text?!
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Mar 21, 2013I am absolutely new to Access. How do I put the primary key from one table into another table?
View 1 Replies View RelatedForeign Key To A Table With Multiple Primary Keyfields???
May 30, 2005I`m designing a database in MS Access '97.
A lot of the tables I`m using have multiple primary key fields.
How is it posible to create one relationship between 2 fields in table A and 2 primary key fields in table B and force integrity?
thx in advance
Composite Keys For Table?
May 12, 2005I need some help with developing a certain aspect of a db. I need to track the equipment list of clinics. The equipment list doesn't really change (it has 5 possible values though each clinic may only have one to all 5 of them). The db is also to track who the manufacturer is.
I was originally going to do a three piece composite key consistenting of the clinic id, the equipment id and the manufacturer id with quantity as the non pk field. Or the other possiblility that I can see is just using an autonumber as the pk with clinic id, equipment id, and manufacturer id as fk's with qty as the non-key field. So what do you think? If you can put in explanation why your suggestion would work, that would be appreciated as I'd like to increase my knowledge base on this stuff.
If I haven't made my problem clear, I'm quite willing to provide more info.
Thanks,
scratch
Forms :: Select Recordset ID For Inclusion As Foreign Key In Table
Jun 17, 2014Trying to use a form based on a table to choose a recordset of values, and pick the ID of that recordset to include in another table as a foreign key.
I am not sure how to even search for what I'm trying to do, though I've tried all the variants I can think of anyway.
The idea being that there are a set of values that are associated with each other, and generally found in conjunction with another set of data. So Table 1 contains data such as this, though this is greatly simplified from the numerics that are actually stored in these fields:
FooID Field 1 Field 2 Field 3 etc, etc...
1 x y z
2 d y z
3 x y q
4 x r P
.
.
.
This data is then associated with the information in table 2, and rather than repeat fields 1-whatever in table 2 I want to use the FooID in table 2 to store the link to all of the subsequent field data. Normalization as I understand it in other words.
I cannot figure out how to pull the table 1 data into a datasheet form and allow someone to choose one of the lines of data, store the FooID into an unbound text box, or some other method, and then run an update query on table 2 to update a field with the FooID for the 12-72 records that are in that table.
Would this make more sense as a combo box in a single form? I've been trying to do this with a datasheet, but I think I'm too limited in appending a check box to an individual recordset this way, or at least I've not managed to get it to work so far anyway.
Tables :: Two Primary Keys Link To Another Table?
Aug 18, 2014So, 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
Table Allowing Duplicate Primary Keys
Jun 13, 2013I've set up a table with 2 primary keys but it is allowing me to input the same combinations twice!
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