Tables :: Multiple Parents Table Linked To Child Table - Primary Keys
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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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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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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Aug 3, 2014
I have modules and procedures. A module can consist of one or more procedures. A procedure can belong to one or more modules.
tblModules
--------
ModID
ModName
tblProcedures
----------
ProcID
ProcName
ModProcs
--------
ModProcID
ModID (FK)
ProcID (FK)
In a listbox I have a one or more modules selected and will construct the SQL in the AfterUpdate, presumably.
How to get a query to list only those procedures that belong to all the selected modules? To get into the result list a procedure must belong to all the modules that were selected. The code below gives me all the procedures that belong to at least one of the modules selected. I need ALL.
Code:
strIN = Left(strIN, Len(strIN) - 1) ' list of ModID's of selected in listbox
strSQL = SELECT tblModuleProcs.ProcID
FROM (tblModules INNER JOIN tblModuleProcs
ON tblModules.ModID = tblModuleProcs.ModID)
INNER JOIN tblProcedures ON tblModuleProcs.ProcID = tblProcedures.ProcID
WHERE (((tblModules.ModID) IN(" & strIN & "))) "
ORDER BY tblProcedures.ProcedureTag;
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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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Mar 26, 2013
I'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).
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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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Jul 9, 2015
I have an employee table(parent) and family (child)members table. I have a field in the Family table called employee which i have created the one(employee) to many (family relationship). When I add a new family member why does the employee id not show automatically show in family table. I have to add it manually.
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Nov 9, 2006
Parents can have one or more children. I want to return the youngest child of those parents with more than one child.I have [QryParent&children] that returns all the parents and all the children. I have used this as a sub query in [QryParents>1child]. This uses "In (SELECT [ParentsId] FROM [QryParent&children] As Tmp GROUP BY [ParentsId] HAVING Count(*)>1 )" as the criteria in the ParentId. This returns all parents with more than one child and gives the name and DOB of the child.I now want to return just the youngest child for each parent.An ideas?
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Jun 13, 2013
I've set up a table with 2 primary keys but it is allowing me to input the same combinations twice!
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Sep 8, 2014
I have a parent table (tblLabels) and a child table (tblRevision) where the revision history for the parent table is kept.
The parent table is populated via an excel import and may have several records imported at once. Instead of having the user manually enter a new record note in the child table for each record imported into the parent table, I've created a form that collects the necessary data (date, person who added the record, person who authorized the record, and notes) and then creates a revision history for each new record.
This is what I have so far:
Code:
Private Sub cmdAddNotes_Click()
Dim strSQL As String
Dim RevisionDate As String
Dim RevisionRevisedBy As String
Dim RevisionDesc As String
[Code] ....
When I run the code nothing happens. No error, no new records create, etc. My suspicion is that I may need to use an INSERT INTO query instead of an UPDATE query, but I'm not sure how to go about matching up the foreign keys if that's the case.
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Sep 13, 2006
Please could you advise me if tables have to be linked in order to perform a query on multiple tables? For example searching for a date and matching records on more than one table at the same time.
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Feb 28, 2005
I made a database that was working fine. It was only after I had finished the database, and data was being entered, that I was informed that the field I designated as the primary key would not work. Origanally, I used 'OffCit' as the single primary key. Now they tell me that one 'OffCit' can be entered several times for different reasons. To solve this, I thought about using autonumbers but have been told, and seen, that this may not be a good idea. So, I am trying to use multiple primary keys. So far I have had no luck. I have attached a screen shot of the tables and relationships. I have 'OffCit', 'AreaofLaw', and 'EffectiveDate' as the primary keys. The same 'OffCit' and 'AreaofLaw' will be used several times in different records. That is the reason for the third primary key. I am wondering if I have set this up right or if there is something I overlooked. Perhaps someone has an idea that may work better. Thanks for any input.
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Sep 13, 2005
I have the following table:
YieldID |ProductID | Year | Month| Yield
I want to make sure that it is not possible to insert the same date (so, year and month together) twice for each productID. But at the other hand, it should be possible to insert the same date but then for different productIDs. How can I make sure that Access does this? Can I use (multiple) primary keys to enforce this?
Thank you,
Stacey
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May 21, 2006
Hi
I have tried searching the forums, but couldn't locate any relevant information. I have an assignment at the moment and am meant to have 8 tables in my data base, two of which are 'User' and 'Hardware' which have the following fields:
USER:
UserCode (Primary Key)
UserFirstName
UserLastName
DepartmentCode
HARDWARE:
HardwareCode (Primary Key)
HardwareName
VendorCode
PurchaseDate
Now I am meant to have another table called 'Hardware Config' consisting of the Primary Key fields from the two tables above, and they are both meant to be Primary Keys in this table.
I have been able to make the 'Hardware Config' table, but I don't know how to make more than one Primary Key... any ideas?
Thanks in advance - dragonfly :o
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Oct 6, 2007
I have a table that has the following fields: Symbol, DeliveryMonth, DDate, Close. This table has information for a large number of different commodities. I am hoping to run a query against the table and find breakouts. I am working on the actual query but my question is this: If I have only one table do I need to have a primary key? There will be no relationships established so what is the need for a primary key unless you plan to link tables together? If it is always a good idea to have a primary key then I will have to have the Symbol, Delievery Month and the DDate together be the key since without all three there would be duplicates. Each symbol has many different deliveryMonths, each DeliveryMonth has many symbols, and each date has many Symbols. SO it takes all three together to get a unique value. Will having a primary key in this scenario help me with writing queries? I appreciate all of your wisdom in explaining how this table should be organized. Thanks:)
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Jul 9, 2006
Looking at a database that someone wlse has created I see that numerous tables have mulitple primary keys. How is this possible? If i try and allocate a primary key it will only let me do it for one field.
I think what I actually want to do is create composite keys but if I set the key then put it to duplicates allowed it says that the primary key is not allowed. Am I mixing up indexes and keys???
How do you assign a composite key
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Mar 21, 2013
I have a table where each record is unique if at least one of three variables is different. The three variables in my case are each integers and are: YearRouteSegment.
Now each of these individual variables allows (and has) duplicates, but if the thing is working right, no pair of records in this table should have all three of these variables with identical values. Is this table a candidate for using multiple primary keys?
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Feb 14, 2005
I can create multiple primary keys for a table MANUALLY (by highlighting several field then pressing the key icon)
BUT I cant recreate it by code.
HELP.
Set NewFld = tdfnew.CreateField("TaskID", dbLong)
Set idxNew = tdfnew.CreateIndex("TaskIDIndex")
idxNew.Fields.Append idxNew.CreateField("TaskID")
idxNew.Primary = True
tdfnew.Indexes.Append idxNew
tdfnew.Fields.Append NewFld
tdfnew.Fields.Refresh
Set NewFld = tdfnew.CreateField("SubzoneID", dbLong)
Set idxNew = tdfnew.CreateIndex("SubzoneIDAIndex")
idxNew.Fields.Append idxNew.CreateField("SubzoneID")
idxNew.Primary = True
tdfnew.Indexes.Append idxNew
tdfnew.Fields.Append NewFld
tdfnew.Fields.Refresh
I am getting an error, there is already a primary key.
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Jan 23, 2005
I am setting up an access frontend to an excel worksheet. I am creating linked tables using the excel input fields. I find when I have created the tables I can't create a primary key as access won't allow modifications to the linked table. Has anyone any suggestions as to how I can set a primary key on these tables. Thankyou
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Dec 14, 2005
Hello,
I want to have a table linked with an excel doc (which is easy to do with the wizard) but I want this linked table to have a primary key (which the wizard does not allow) because this table will be in a one-to-many relationship
How else can I do ?
thanks
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May 4, 2006
I 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
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Apr 16, 2015
I have an unbound new contact data entry form that adds records to many different tables. I have no problems adding one record to a child table at a time, but one of the things we are collecting is a list of online networks a person belongs to, and I want to be able to stick a "check all that apply box" on my form and have it add multiple records to the child table. Here's the basic set up, I have a parent table with the main contact information with a primary key field "IID", a lookup table with "Facebook, LinkedIn, Twitter..." etc in it with a primary key field "online_id", and a bridge table to link the two which should have multiple entries for IID, one for each online_id. I want to use a listbox (or something like it) that the user can select multiple online networks and then have records added to the bridge table. I can figure out how to add the listbox on the form, what I can't figure out is how to get the values out of the listbox. T
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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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Feb 12, 2014
I've built a system with around 20 tables in it. All of these use the standard ID field offered by default by Access as the primary key. A friend with a background in database design and development for large corporates using Oracle has reviewed the database (he is going to do some VBA programming for me) and suggested that we use more appropriate primary keys based on data attributes.
He has read "somewhere" that there are problems with the standard ID fields and that occasionally the fields are renumbered/reindexed and that this can cause problems. There are a fair number of queries and some complex forms which will need to be updated for these changes but it would be a shame to go through all this work if it isn't really.
Should we use the standard Access IDs and is it worth a chunk of effort to change from where we are now?
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Sep 28, 2015
Currently we have a web based order taking/inventory system. Every night they export a .db to an FTP server and every morning I download it (I automated this part, it replaces the older file). I link to this database (using SQLlite3 to ODBC driver) from an Access database for specifically this purpose.
When I originally created it I had to go through every table and create a unique identifier. Unfortunately I chose poorly in some cases. I can't figure out how to get those primary keys changed to the correct ones. I've tried recreating the ODBC connection, tried a new database and new ODBC connection, tried killing the connection waiting a day (for the new .db to download) and recreating the connection and trying it in a new database.I know access doesn't allow you the change the primary key in a linked table.
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