Stumped. Table Relationship / Normalization
Apr 25, 2005
I am having trouble visualizing how to break out the following info into functional Tables
I have a table to hold Items
tblListG1Items
IDItemList
ITemNumber
ItemName
I then have a detail table
tblDetailG1Items
IDItemDetail
FKToItemList
ItemMFG
ItemMSP
ItemLead
Here is where I get lost.
Each item has a variable for each month
So item 1
January = .01
February = .03
ECT.
Once set the Variables rarely change, at most once per year.
I will need to be able to pull an item and based on what month it is pulled uses the variable to multiply several other factures.
My first Thought was,
tblVarItemList
IDVarList
FKToItemList
VarJanF
VarFebF
VarMarF
--And so on--
It just does not look right.
Any Suggestions on what might work Better. :confused:
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Nov 20, 2007
I'm not a programmer and know very little about setting up access databases other than the very basics...however...due to my politics background, I'm setting them up for the local government....just my little disclaimer about why I'm asking stupid questions.
I am creating a database for multiple users who are of two sorts. The users deal with either the setting up of a contract, or with the payment of a contract. Both of these groups need to be able to access different information about the same contracts. What seems most logical to me is to create two tables in the same database, one for the contract, and one for the payment information and have both update when one or the other is worked on.
My basic set up for now is this:
Table One: contract information
Table Two: Payment information
Link Key: Serial Number from contracts
These are my questions:
1) is there a way to set this up so that the only way someone from the payments group can create a linked record is if a record with the same serial number already exists in the contracts table?
2)Is there a way I can set it up so that when someone in the payments group starts to input their information, they can find the serial number they want, and have certain fields show up? For example: I want them to be able to search for a serial number and have the contract name show up with all of the previously entered payment information, then have a new field each time they go into it for their next payment (if that makes sense).
3) When linking, hopefully in such a way as to do the above, do I need to have the same field name in both tables, or...? I'm a bit confused as to how this works as initially i created a field in both tables that would have the same serial number and tried to link those..and it didn't work.
Sorry if this is so confused...I'm sort of learning as I go along.
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May 16, 2005
Hey buddays,
I have a contract-tracking database that has been in use for about a year. It used to be that every contract had the same number of periodical "applications" with it - the companies we worked with would send in 4 applications over time.
So, I had this set up:
tblCompanies (the companies with whom we work)
- CompanyID (Primary Key autonumber)
- CompanyName
- Address, contact info, etc.
tblContracts (the contracts we issue)
- ContractID (Primary Key autonumber)
- CompanyID (foreign Key)
- DateIssued
tblApplications (things companies send back to us over time)
- AppID (Primary Key autonumber)
- AppDesc (description of the application - something like "Application 1", "Application 2" , etc.
tblAppsRecvd (Join table/log of apps received)
- ContractID (foreign key to tblContracts, so we know which contract this applies to) (also a composite primary key, so we don't duplicate an app to a contract)
- AppID (foreign key to tblApplications, so we know which application we rcvd) (also a composite primary key, so we don't duplicate an app to a contract)
- DateRcvd
Pretty self explanatory. Everything was keen, and I was reaping the rewards of a job well done.
But now we've expanded out contract offerings. He have introduced 2 new types of contracts, and each contract has a different amount of applications associated with it.
Contract 1 has 4 apps.
Contract 2 has 2 apps.
Contract 3 can have 1 to 8 apps. (The last app before a contract closure is always considered "Final" - so if we get 5 apps, it would be apps 1, 2, 3, 4, and Final.)
I've tried implementing a couple different schemes, but none seem to be fitting the bill. The type of contract will dictate how many apps we receive - i.e. If we are using Contract 1, then we KNOW we'll recieve 4 apps over time. So, is this as simple as adding a "ContractTypeID" to the tblContracts with an appropriate tblContractType table, and expanding tblApplication to more apps, or is there a smarter scheme?
Thanks, buddays!
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Sep 15, 2006
Im setting up a database that contains information about printed circuit boards that are being developed for our current project. The information that i need includes the following:
Board # - 3 digit number
Board Name -
Module # - 9-digit number
Module Name -
Project Leader - engineer responsible for design
In/Out/Oem - inhouse, outsourced, or purchased OEM
Designer - engineer or outsource contractor who designed the board
MFG/Assembler - company responsible for building the boards
Directory - file on network drive the drawings are located in
There can be mutiple boards in a single module. So i have 3 tables right now.
pcb_tbl - this includes all the info above minus the module info.
Module_tbl - this table includes the module number and name and responsible engineer, with the module number being the key.
module_pcb_tbl - this table lists the module number in the first field linked to the module table, and the pcb number in the second field linked to the PCB table.
Am i doing this right?
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Dec 4, 2005
Greetings-
I am having trouble with the table design of my db.:confused:
What I am is a human resource supervisor trying to develope a database to
track the hundreds of actions that come in and out if my office on a weekly basis.
I am almost there, in regards to table setup and relationship setup, except I am stuck on something and any advive I can get would help tremendously.
Here is what is going on:
I need to be able to relate my customers to the actions they turn in..and track them, the actions, until complete.
I have attached my db and will answer any questions needed. Will someone please take a look at it and evaluate what you may think is needed to get the "ball" rolling.
Thank you for your help
DW
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Apr 8, 2008
Hello,
I have attached a screenshot of the relationships in (a section of) a database I am working on. Would anyone please be willing to view it and offer any suggestions as to whether is fully normalized or not? Here is the description:
An account [table, Account] consists of some money. That money is split-up and invested into several different places.
The funds that are available as choices are in Fund; the funds that are chosen are in InvestmentInstance. Different, unaffiliated accounts can invest in the same fund. I would like to keep track of when an account begins to invest in a fund and when it stops investing there (“InceptionDate” and “CloseDate”).
The generic, account-independent performance of a fund is kept in Price, where the values come from Yahoo! Finance or something like that.
Similar to Price, MarketValue stores the dollar-amount of an investment, specific to an account.
I think I have most of it set OK, but my main concern is about the relationship between InvestmentInstance and MarketValue. As the picture shows, I use InvestmentInstance’s “Id”* as the “one” in the one-to-many relationship, but “Id” is not a primary key. To get it to work, it was necessary to set the Index option to, “Yes (No Duplicates),” so that it was a unique index. Is this a bad practice? Should I just include “Id” as part of the compound primary key? I didn’t think making it part of the compound key was a good idea because then it would defeat the purpose of having “FundId” and “AccountId” control the uniqueness of records. Am I missing something important?
In other words, how can I correctly create a one-to-many relationship that begins in a juntion table (InvestmentInstance) and connects to a new table that was not involved in the normalized many-to-many relationship (MarketValue)?
Thank you!
* I know many like to include the table name in the ID, like, “InvestmentInstanceId,” and it is only my preference to keep it just as “Id” for a local key for simplicity, but add the table name when it becomes a foreign key. I feel “Id” is good enough for my purposes and it’s table location is usually clear from the context.
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Jun 16, 2006
Im planning a db client's dinner questionaire that will comprise of client's favorites (meals, games, transportation). Each client is allowed to bring a guest. So the client's will also be filling out "the same set" of questionaire for his/her guest.
Meaning, a user will need to fill out the same form twice, one for himself and one for his guest.
Now, my question is, should i have two tables. Client's questionaire table and Guest questionaire tables with foreign key in the guest's table showing who's guest the question belongs to?
Or should i have one table for everyone (since they are the same set of questions). Having one table seem like a wise idea since it's the same set of questions (don't want to have 2 duplicate tables with only one field different). Now, if i go with one table. How do i go about handling this? So that client's and guest's info are linked. and i can run a query to tell who's guest it is? I have never tried thsi before. Care to share your thoughts?
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Sep 29, 2014
I am using this query to cluster a group of customers by monthly revenue. The issue is that I get duplicates. The customers appear more than once because the condition is valid more than once. How do I get access to select only once a field from Normalization sheet table??
SELECT [Cust Profile This Year].MSISDN, [Cust Profile This Year].[Total Revenue], [Normalization sheet].[Arpu Range] FROM [Normalization sheet], [Cust Profile This Year] WHERE ((([Cust Profile This Year].[Total Revenue])>=[Normalization sheet].[Arpu]));
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Aug 2, 2006
Hi,
I m trying to find a way of automatically inputting the progress of my project.. it's confusing so i'll try ot explain more. I have a project plan broken down into weeks . Each element of this has a schedule and complete date for various different milestones which indicate what week my project is sitting at:- eg: I have reached this milestone therefore my project is at week 10 and so on until completion.
Is there some query I can run that can do this automatically?
I'd be grateful for any help on this.
Thanks K
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Feb 17, 2005
hi all - i know there are many threads relating to linking pictures to records etc, but forgive me for asking one more time:
I have managed to get pictures into my dbase - using Microsoft KB help - by linking them in a table to an external source.
However, I want the dbase to know which picture is for what details. eg. I have a cars sales dbase. I have all the pictures in one folder of all my cars which are linked to the dbase. When I pull up car details in the form, I want the picture to come up aswell - the correct picture.
Pls let me know if this has been done. Sorry for extending this topic; however, I could not find a "simplish" soln. to this.
Thank you once again :o
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Apr 25, 2008
I’ve developed a query that produces a list of forms and an effective date where the form may be applicable. But now I am stumped. I need to reduce the results to a specific state (which I’ve done and it works) and for a specific date (the stumped part). Let’s say user needs 2/15/2005. I think I can eliminate forms with effective dates greater than 2/15/2005 (not quite sure how yet) but I am perplexed how to eliminate certain forms that are no longer valid because they’ve been superceded. In the sample table for CA, I would expect the following forms retuned and no others: CG0001 1204; CG0002 1204; CG0009 1204; CG0033 10 01; CG0034 1204; and CG0035 1207. The expected results for the CT column would be different (though some would be the same).
Any advice to point me in the right direction would be appreciated.
FormNumForm_vdt CA CT
CG00010798 09/01/1999
CG0001100103/26/200102/01/2002
CG0001120407/13/200407/01/2005
CG0001120712/05/200712/01/2007
CG0002100103/26/200102/01/2002
CG0002120407/13/200407/01/2005
CG0002120712/05/200712/01/2007
CG0009100103/26/200102/01/2002
CG0009120407/13/200407/01/2005
CG0009120712/05/200712/01/2007
CG0033019603/26/200105/01/1996
CG0033100107/13/200402/01/2002
CG0033120412/05/200707/01/2005
CG0033120712/07/200712/01/2007
CG0034100103/26/200102/01/2002
CG0034120407/13/200407/01/2005
CG0035100112/05/200702/01/2002
CG0035120403/26/200107/01/2005
CG0035120707/13/200412/01/2007
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May 18, 2005
I have a form with two subforms. One of the two subforms works perfectly. The other just gives me a grey screen (like there's no recordset).
The two forms are very similar and I've checked everything I can think of... Here's what I've done. If you can think of anything else to try, please let me know - This is driving me crazy!
1) The subform works independent of its parent
2) The source object for the subform is set properly
3) The child and master fields are set properly. Data types are the same.
4) The record source for the form (used as subform) is set to the correct query.
5) The query used has been run independently with no problems
6) The form has a bound text box with the proper control source
7) I've tried placing a breakpoint at the first line of form_current.. never gets hit.
I don't know why it's not working and there's nothing that tells me what/where the problem is. I'm out of ideas on this one.... Any help is greatly appreciated!
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Feb 10, 2005
Hi all,
I have a form with the following fields:-
StartTime = Format dd/mm/yyyy hh:nn:ss
ExpFinishTime = Format dd/mm/yyyy hh:nn:ss
Dentist = Number
StartTime is bound to my table, ExpFinishTime is calculated in the forms underlying query.
Before the record updates I am trying to check if anyone already has an appointment scheduled in during that particular time for that particular dentist. So if the record being added has a starttime between those two times for that dentist, throw up a message box.
Thanks for any help.
Taff
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Jun 3, 2005
I've been asked to collate some information based on a kid league, I am trying to sort out how precisely it works
the data I have is this
finish position, name, club
I need to calculate the best kiddie based on 3 of a possible 6 races
So tbls
tblResults
fldSeries
NAME
CLUB
Pos(isition)
tblScores
fldID
pos
Points
query1
SELECT tblResults.fldSeries, tblResults.NAME, tblResults.CLUB, Sum(fldScore.Points) AS SumOfPoints
FROM tblResults LEFT JOIN fldScore ON tblResults.Pos = fldScore.Pos
GROUP BY tblResults.fldSeries, tblResults.NAME, tblResults.CLUB, tblResults.Pos
HAVING (((tblResults.fldSeries)="220-2005") AND ((tblResults.Pos)<51))
ORDER BY Sum(fldScore.Points) DESC;
I need this to be changed to only pick up athletes with only the best three scores?
any hints?
STuart
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Nov 2, 2006
Form: frmProduct
Field: unitprice.
I have some simple validation that unit price is greater than 0. The code is this:
If Me.txtUnitPrice.Value <= 0 Then
MsgBox "Please enter a value greater than zero", vbOKOnly, "Alert"
Me.txtUnitPrice.Value = Null
Me.txtUnitPrice.SetFocus
End If
However, when I run it, the setfocus doesn't work. It jumps straight into the next field. I can make it run to any other field (productname, productID). But not back to UnitPrice.
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Mar 27, 2008
Hello,
When I try to run any query that contains a specific table I get a message a Not enough memory error. I can open that table which, contains 47 thousand records and view that data unless I get to one record then the entire database crashes. I have tried to Compress and Repair and the database crashes. When I say crash I means it completely disappears and I get the send error to Microsoft Message. I can not select record due to it crashes when I get to it. I have also tried selecting record by going to one above the quickly scrolling to a record way below it and it errors and crashes. I have tried to delete it using a delete query and it only returns “Invalid argument” when I try to select or delete.
ANY suggestions or ideas would be greatly appreciated.
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May 31, 2005
I've got a problem with a make-table query that creates a new table which is then populated with new values that relate back to the original table the trouble is the make-table won't run with that relationship in place.
Is there a way to delete the relationship then reinstate it after the query? or any other way round that someone can think of.
Thank You
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Jun 6, 2005
How can I have table data refer to other data in the same table? For example: If I have a table of people I know, and I want to 'link' family members together, and these other family members are also listed in the table of people I know.
Table: People
Field#1: PersonID
Field#2: PersonName
Field#3: FamilyMember1 (using the PersonID)
Field#4: FamilyMember2 (using the PersonID)
I hope I've explained myself clearly.
Thanks for any help.
-E
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Aug 29, 2006
Hi, I have 2 related. In the first table I have a primary key number and another ID number.
On the 2nd table which is related by the PrimKey I want the ID number to come up automatically. I can't remember how to do this. Can anyone help?
thanks
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Feb 1, 2007
Hey guys
Access rookie here (and I mean ROOKIE).
I have two tables.
One with details of people's information (mothers).
We also need to enter information for their babies.
Basically I have set up a form with the info for the mother's details, and she has a Mother ID. The baby also has an ID which should be the same as the mothers (linking the two tables).
When I enter the info into the form for the mothers details, I hit the command button that opens the baby's details, however it has not created a baby ID that is the same as the mother's ID, therefore there is no relationship. If I enter in the baby id, and fill out the form - I goto the table and see that it has made the link and the information is complete. However, I don't want to have to enter the ID each time.....I just want the mother's ID to carry accross to the baby's ID field, hence linking the two.
Why isn't this working?
Thanks for your help!
Ryn
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Mar 7, 2007
Hi there,
Hope you can help...
I am having problems with a current database i have designed which was initally for Products/Stock. I now want to intergrate Services into the equation. I have attached a proposed design, but whenever i add the Services table and relationship, everything, in the sense of data disappears.
I can upload my Database if needs be.
Thanks,
Jon
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Jul 19, 2007
I'm having trouble modeling a relationship in a database. I need conceptual help. Here is an abstract description: A Class has several common attributes, but there are some attributes that differentiate different instances of this Class. For example, this Class may have x fields. ClassB will have those same fields and several others, so Class B will have (x+y) fields. Class C will also have x fields and an additonal Z fields for a total of (x+z) fields. x and y may be the same number or not, but they will certainly not be the same type of fields. See attached for picture.
My thinking is that since all the classes have x fields in common, why not have super class in its own table (ClassA), and have two (or more) tables composed of y and z fields respectively. The primary key (A1, lets say autonumbered) in the ClassA table would also be the primary key in ClassB and ClassC tables.
My goal is is have a subform within a form, where the form has all the fields from ClassA and the subform will have all the fields from either ClassB or ClassC depending on another field in ClassA (A2, text type for example). In essence, the layout of the subform would change depending on the value of A2 from the ClassA table.
Can this even be done. I think I'm missing something here. Would anyone care to offer advice?
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Feb 19, 2008
Hi, I have these two tables
horse_entries
ent_HorseName (PK)
ent_entries
horse_information
inf_HorseName
inf_Ground
inf_Notes
I have no records in horse_information yet. I need it so that when a record is added to the first table then whatever is added to ent_HorseName is added to inf_HorseName. So I want all the records from horse_entries in horse_information. I want to be able to add to horse_information without that record being added to horse_entries. What kind of relationship should I use. Thanks
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Sep 30, 2004
I have a form to insert data into the table1 of the db.mdb file.
In db.mdb file I have two tables one is table1 and other is table2 now the fields in both table are as follow
Table1
ID (AutoNumber)
Name (Text)
Roll No. (Number)
Class (Text)
Address (Text)
Result (Text)
Table2
ID (AutoNumber)
Roll No. (Text)
Result (Text)
Now I want that whenever that data is posted into table1 then table2 should autoupdate the corresponding data.
Please guide me how this is possible?
With Regards.
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Jun 5, 2005
ok im working on a database that a company sends its employee to school and tracks there training.what classes they take what not.. my tables were fine until i realized that supervisors were also employees so i need to add a supervisorID i dont know how to do it without screwing up all my foreign keys i assume it goes into my employee table and department table but then where do i put my departmentID foreign key?
tblemployee(employeeID,firstname,lastname,phone,hi redate,payrate,DepartmentID)
tblDepartment(DepartmentID,name,supervisor)
tblClasses(ClassID,name,Description,credits,sectio n,TrainingID)
tblTraining(TrainingID,type)
tblClassEmployee(classID,EmployeeID,instructor,dat e)
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Jan 11, 2006
I currently have a database which I believe is in 3NF. It's completed as such, but I have recently come accross normalization methods. Because of this I would like to know how my 3NF tables could look in 0NF, 1NF and 2NF. For both the purpose of ensuring the database is correct now, and for future reference...to do a more professional job next time!!Here's how the tables currently look:CUSTOMERS(CustID, CustName, CustAddress)ORDERS(OrderID, CustID, OrderDate)ORDERDETAILS(OrderID, BookID, BookPrice, Quantity)BOOKS(BookID, AuthorID, BookName, BookUnitPrice)AUTHORS(AuthorID, AuthName, AuthAddress)It's just basically a simple book royalty system. I have looked around various sources for examples, but my database has a few more tables in 3NF than most examples show.Thanks guys.
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