Tables And Table Structure Needed For New DB
Oct 31, 2005
Firstly, I want to admit that my knowledge about data base construction is fairly basic.
I am trying to build a data base for humanitarian projects that do not at all resemple of the usual examples including customers, invoices, suppliers and what have you. My problem in constructing the DB is that most of the projects will address more than one subject and also include more than one target group and even operate in more than one country.
In my first attempt I filled the relevant fields (subjects, target groups and country) with more than one value using a form with multi select lists. The problem was that it was very difficult to query these multi-value fields and kind people in this forum strongly advised my to reconstruct the DB avoiding such fields.
What I need is to be able to view/print various selections based on precise criteria that include a region (or country), a subject and a target group in all kind of combinations.
The problem is to decide on what tables to establish and their interrelation. I guess that when entering a project record (using a form) I will have to store somewhere what subjects (could be more than five) and target groups the project include. It is, of course, not a problem to establish special tables or value lists for the subjects and target groups and countries, but where/how do I store the basic project information for a project and the multi-values that are related to the individual project?
I hope that this is not too confusing and I would appreciate any suggestion for a simple table structure and the interrelation between the tables.
Many thanks in advance.
Niels
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Nov 16, 2004
Hi everyone,
Could someone please share their opinion with me on the following:
I have a database with a Table which stores People's details, e.g. ID, Name, Surname, ...., etc (e.g. tblPeople) .
Now I have people filling out a questionnaire, of which the results I want to save in an Access table. Each person will fill out this questionnaire only once. The number of fields I will need to accomodate the answers to questions asked, is around 120. For example, an answer to Question1 will appear in a field called Q1.
I know that the limit for fields in a table are 255, and my total fields in tblPeople so far are about 20.
Should I keep Q1 and all other fields in the same table as tblPeople, or create another table to hold all answers and create a one-to-one relationship between tblPeople and tblQuestions&Answers ?
Can someone give me a tip, in particular if this will cause performance problems?
I appreciate your effort for reading this.
Kind Regards,
Jean
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Dec 29, 2004
I manage academic papers whom are written by multiple authors and reviewed by multiple reviewers. Currently, all the data is stored in one big table and I'm not able to get any statistics or real tracking out of it.
I have set up a test DB with 3 tables so far:
Main
Table_ID -auto sequential key
CORP_ID -internal paper id
STATUS -open, overdue, accepted, rejected
REC_DATE -received date
MOD_DATE -record last modified date
TITLE
AUTH1_ID -linked to Author.ID
AUTH2_ID -linked to Author.ID
REVR1_ID -linked to Reviewer.ID
REVR2_ID -linked to Reviewer.ID
Author
ID -key field
NAME
DESIG -designation
EMAIL
PHONE
Reviewer
ID -key field
NAME
DESIG
EMAIL
PHONE
RATING
My goals are these:
Create a module that manages the authors. They are usually the same group of people. Each author should only appear once.
Create a module that manages the reviewers. Also, usually the same people (but different than authors). Each reviewer should only appear once.
Create a main form that allows the end user to add a record (paper), assign author(s), assign reviewer(s).
Create Query/Report that would then be able to:
- track authors and their papers
- track reviewers and their reviews
- as well as track papers and their authors/reviewers
When I create subforms, they appear to be 'backwards' meaning that the Author form tends to be the main form and the Main form tends to be the subform. I think this is b/c the Author.ID field is the key field, whereas the Main.TABLE_ID is the key field, but not relevant for other than keeping things straight, nor is it related.
Can someone point me in the right direction?
Alternatively, has someone created a database like this already that I can buy? :)
Thanks!
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Mar 12, 2006
hi everybody,
great resource you have here! my employer is tracking around 250 pieces of data for each client at our facility. i am making a new access system based on their existing mysql database and web front end. before i start messing around with forms and reports, i want to see how well this existing structure will work in access, and what kind of approach i should take. i am a newbie with access, but lots of experience with asp/mssql/php/mysql. making web forms is so time consuming that i figured i would be best off moving the whole thing to access and starting from scratch.
client information is stored in eight tables. each table has around 30 fields in it. the first table has a primary key autonumber, and the other seven tables have foreign keys with unique constraints that point back to the first table. that is, for each client record in the first table, there can only be exactly one corresponding record in the other tables.
i did some data massaging, and got the eight client tables into one big table, but the resultant table has almost 250 fields in it, and access doesn't seem to like working with tables that big. so i am thinking that it is best to leave the eight tables separate, but linked in one to one relationships.
i was kind of ideally visualizing a form with eight tabs so that i could edit/update all of the information from the eight tables rather seamlessly.
my question is: what approach to table structure will best suit my needs, and what approach should i take to add/update/delete the info with forms? will i need to do vb for this? any good one-to-one example databases anybody could point me at?
thanks a million,
harry doyle
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Jul 8, 2013
I need to combine two tables that have identical structure to one table. Different people have used them to insert data from different parts of our project. I have tried to find information about how to do this but so far with little luck.
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Dec 24, 2013
I have a table where in 286 different fields have to be updated by the users. ( Nature of project And i have 10 fields which are coming as a input from another table, so i use Append and Update query to add the new datas and update the datas in case of any changes in the input from another table. ( to avoid manual corrections)
Now coming to my real problem, all the 286 fields have to be updated by the user's are check box type, now what is the solution since access will not accept more than 255 fields?
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Apr 2, 2015
I have been working on a a table design, but I am failing to create the correct relationships.My main table is the tblIncident with the three remaining tables being linked via a one to many relationship. I am using an auto number as my primary key, then linking that number to a FK in each table.
The end goal is to create one form with a varying sample of combo boxes, check boxes and data entry fields from each table. I did not plan to create a subform for each table, but maybe that is required?
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Nov 8, 2014
I am starting out creating a training database to track training needs and expiring training etc.I'm just looking for some tips as to how to structure the tables and relationships..I have an employee table, department table and training type table.However im wondering how i can set up requirments and then match these to check if the person is trained up to date on all required skills?
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Jul 19, 2014
I need a table structure that will allow me to have a repair log data entry form with 3 cascading combo boxes on the repair log data entry form. There can be many repairs for a specific job but most of the time there will be one repair per job and 1% of the time two or more repairs for a specific job.
I am pulling a report based on a query that will show the repaired location, facility type, repaired item, repaired component on that item and other details related to the repair.I uploaded an empty database with the structure.
Cascade levels
I. Facility Type
II. Item by [I]
III. Component by [II]
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Jan 8, 2013
I need to modify my customer table to cater for multiple names at one address.
Should I move all the addresses into their own separate table or leave them as is (name-Address-postcode- email etc in one table) and put the additional addressees into a separate table or is there a better way I have not thought of.
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Aug 17, 2015
Looking for efficient table structure for this. Let's say I have a list of contractors who will get paid a certain amount of money each week. The amount of money changes each week by measuring the amount of work done, giving it a price and calculating it. The fields are these:
[pk]WeeklyWorkID
WorkID
Quantity
UnitPrice
Total=Qty*UnitPrice (not stored in this table)
EmployeeID
WeekID
So far, it's all good, but we wish to pay the contractors in an unusual way. Let's say he makes $16,000 of work this week, and we want to pay him using cash AND/OR either one or multiple debit cards. For example:
Cash: $1,500
Debit card 45: $7,500
Debit card 71: $4,000
Debit card 13: $3,000
Total = $ 16,000
We can only deposit $7,500 max in each card. But it's even worse... two or more contractors can SHARE the card and it's not always the same card. Sounds pretty funky, but it's what the company wants to do. So, what would you recommend me in this case?
I'm guessing I'm gonna need these tables: tbWeeks to hold the week number, tbCards to store the cards' info, and an extra table to make a many to many relationship between the cards and the employees.
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Jun 1, 2005
Hope the thread title wasn't too confusing.
I have a database that tracks emissions from painting. Bear with me since this is going to be a long post.
:o
Some background info.
- a paint can consists of many parts mixed in a specific ratio.
- a part cosists of many chemicals
- a part may be used is many different paints
Here is how I have the existing database structured now. I’ve simplified it somewhat.
tblPaint
PaintID (PK)
PaintName - String
PaintDensity - Double
PaintVOCContent - Double
tblPart
PartID (PK)
PartName - String
PartDensity - Double
PartVOCContent - Double
tblRatio
RatioID (PK)
PaintID (FK)
PartID (FK)
Ratio - Integer
tblChemicalWt
ChemicalWtID (PK)
PartID (FK)
ChemicalID (FK)
WeightPercent - Double (Percent)
tblChemical
ChemicalID (PK)
strChemicalNumber - Long
strChemicalName - String
tblUsage
UsageID (PK)
PaintID (FK)
UsageDate - Date
UsageAmount - Double
PK = Primary Key (Autonumber)
FK = Foreign Key (Autonumber)
The Density or VOC Content (VOC = Volatile Organic Compound) for a paint can either be given OR it can be calculated by the mix ratio of parts and their respective Density or VOC Content values. One or the other must be complete.
What I did not account for was that there may be changes due to the paint manufacturer revising their paint composition, such as;
the parts that make up a paint may change
chemical make-up of a part changes (can be a change in Weight Percentages or the addition or deletion of a chemical).
ratio in which parts are mixed for a paint changes
Density/VOC Content values may change for a Paint or Part
The problem is that I cannot simply change the existing records as the emissions are calculated using all the data from each table and emissions need to be calculated using the paint/part/ratio/chemical weight percent info that was valid at the time of usage.
Another thing is that the Paint Name will not change, it’ll always be something like “BrandX Acrylic Blue”.
The person entering usage data only knows how much of what paint was used for a given day.
The person who enters paint usage has nothing to with entering the chemical make-up for parts and information for the paints and vice versa.
At any rate, my new draft table design is as follows. Two of the tables (tblChemical & tblUsage) will remain the same.
tblPaint
PaintID (PK)
PaintName - String
tblPaintVersion
PaintVersionID (PK)
PaintID (FK)
PaintDensity - Double
PaintVOCContent - Double
PaintVersionDateIN - Date
PaintVersionDateOUT - Date
tblPart
PartID (PK)
PartName - String
tblPartVersion
PartVersionID (PK)
PartID (FK)
PartDensity - Double
PartVOCContent - Double
PartVersionDateIN - Date
PartVersionDateOUT - Date
tblChemicalWt
ChemicalWtID (PK)
PartVersionID (FK)
ChemicalID (FK)
WeightPercent - Double (Percent)
I might be able to do away with tblRatioVersion and just have one table to store the mix ratios. It should be the case that a change in mix ratios (either a change in mix ratios and/or what parts make up a paint) means a change in the Paint Density & VOC Content. But I am presenting both versions of the Ratio tables here for completeness.
Version 1
tblRatioVersion
RatioVersionID (PK)
PaintVersionID (FK)
RatioVersionDateIN - Date
RatioVersionDateOUT - Date
tblRatio
RatioID (PK)
RatioVersionID (FK)
PartVersionID (FK)
Ratio - Integer
Version 2
tblRatio
RatioID (PK)
PaintVersionID (FK)
PartVersionID (FK)
RatioVersionDateIN - Date
RatioVersionDateOUT - Date
Ratio - Integer
I plan on having the DateOUT fields be populated automatically to match the DateIN for the new version. That way I can use “BETWEEN DateIN and DateOUT” to select the appropriate info for calculating emissions. The idea came from an old thread I started (http://www.access-programmers.co.uk/forums/showthread.php?t=31677&highlight=historical+data). I think this is the way to go, but with all the relationships going on, I'm having a hard time wrapping my head around it all. Am hoping someone here can help me with this.
Anyone see any problems with the new table design?
Anyone know a better way?
:confused:
Some potential issues that I see
If only the Density/VOC Content changes for a Paint, then the old set of records in tblRatio must be duplicated.
If only the Density/VOC Content changes for a Part, then the old set of records in tblRatio & tblChemicalWt must be duplicated.
Thanks for reading this post all the way to the end!
:D
EDIT: Thought about it some more.
A new version of a Part, should trigger a new version of Mix Ratios which in turn should trigger a new version of a paint.
Part --> Ratio --> Paint
Ratio --> Paint
Also, a change in a Part must trigger a New Paint version for ALL Paints that currently use it!
:eek:
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Apr 21, 2005
I don’t understand how to structure tables and relationships.
I want to build a form that allows the user to search for a postal service from a group of carriers.
User must be able to input into a form:
Weight in g, Kg or lbs
Insurance level required
Whether signature is required (Yes/No from drop down list)
Collection/drop-off options (tick boxes)
Each service has a different insurance level, some need signature; some services collect, and all have different rates.
I just want to know how to structure the database.
The main part of my question is what would be my main table be and what fields would be contained in it, and what foreign keys would be introduced to pull in info.
Would you have a different table for each service?
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May 8, 2006
If i make minor changes in the backend db structure (eg add a feild, change properties of a feild in a table,). These changes are not reflected in the frontend. how can thses changes be reflected in the frontend usig the simpest method.
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Feb 9, 2005
I am creating a database where the user can import data from a number of spreadsheets (one spreadsheet for each company). Currently I have one table for each company with the year being the primary key. Each year when a rolled over spreadsheet needs to be generated for a certain company I have Access import the data to a blank template in excel which will display the prior 4 years of data (for informational purposes) and leave a column blank for the end user to fill in the current year data. When returned the current year data is imported into the database.
My problem is that I cannot see a way to do this without having a seperate table for each company. If I have one table with all company data I cannot use the year as the primary key. Any suggestions on how I can reduce the amount of tables I need. Setting up the rest of the tables wont be a problem, but future users of the database will have to go through the process of creating tables for new companies and creating all the queries and macros associated with that table.
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Aug 2, 2005
How can I add an additional field to a table based on the output of a query? For example, I have table A with 2 types of records and table B with only 1 type of record. Based on this, I can determine which records in table A are the same type as those in table B. I would however like to be able to flag within table A, those records in table A that are the same as those in table B.
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Oct 1, 2006
I want to add 3 new fields to the structure of around 80 tables (all with identical structures). Is there a way to automate this process?
Paul.
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Apr 12, 2013
I'm creating a timesheet/check in system (log in when the person starts work so it logs it and when they log out it logs that also for the manager or someone with high power to see.) for a fictitious scenario for an IT major project but I'm not sure where to start!
At the moment I have a few tables that are like this.
Table: Employees
Fields: EmployeeID, First Name, Last Name, DOB
Table: PayRates
Fields: RateID, EmployeeID, HourRate, TotalHours
Table:WorkTimes
Fields: EmployeeID, PayPeriod, WorkDate, StartTime, EndTime, TotalHours
I'm not entirely sure if this is all correctly structured, it just doesn't look/sound right to me.
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Sep 8, 2011
I have a psychology project where we soon use a questionnaire on a daily basis (maybe 80 variables per day per subject). Currently, there is no data in the database.
I've managed to create a table called day1 (with 80 day1 variables) and a form that looks like the questionnaire we want to use (and linked apropriately to the variables in the table for day1).
What is an easy way of duplicating the table and form for successive days? That is, i want the structure of the day1 table copied to another table (call it day2). It has exactly the same variables except they are slightly different to differentiate them from day1. I would like the form for day2 to have exactly the same layout as the form for day1, but link to the variables in table 2.
I know i could just couple the day1 table, change the variable names slightly, and then copy the form for day1 and change the links to point to table2, but there are many assessments (18 days).
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Mar 4, 2014
I haven't been on Access for a while so im still in the process of getting the cogs turning....... i am trying to design a database structure for controllers and heating.
each controller can have many heating units
each heating unit can use many controllers
rather than code everything, how could i set this up?
Example:
Controller01 can be used with Boiler01, Boiler04, Boiler12, Boiler 20
Controller02 can be used with Boiler01, Boiler05, Boiler15
Controller03 can be used with Boiler02, Boiler03, Boiler04, Boiler20
I have a table with a ControllerID and a table with a BoilerID. In the boiler table, i have the ControllerID and a one to many relationship.
How would I set this up?
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Apr 20, 2015
I'm trying to copy the structure of a table to make a temp table. I'm using CopyObject (which also copies the data). So when I delete the data from the temp table, it also deletes data from the source table. Is the data linked? It should just be deleted from the temp table. Below is the beginning of the code. I've stepped through, and at the last step shown, the data in the source table deletes.
Code:
Dim strFile As String
Dim temp As String
Dim tbl As String
Dim db As DAO.Database
' error handle
On Error GoTo F_Error
[Code] .....
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Oct 28, 2004
Here’s a little scenario:
An engineer requests that “x” amount of computers are ordered for the company. The estimated costs of the system(s) are determined. The estimated cost of the systems is forwarded to a manager, and the request must be approved by a manager before the order is placed. Once the manager approves the request, the order is placed through the ordering company. After the ordering company approves the order, an order number is assigned and serial number(s) specific to each computer is associated with that order number. At this point it is possible to track the order status via existing programs using the assigned order number and serial numbers. After it is determined through the existing software that the order has been shipped, invoiced, and received by the Receiving department, I need to physically go pick up the systems and submit them into my Central Inventory. From the central inventory, systems will be checked out to employees as needed, checked back in when testing is finished, or transferred internally between employees......
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Nov 15, 2004
Hi everybody,
Please, I really need some help with my normalised tables and relations:
1.AdmissionID
AdminYr
.......
2.StudID
SName
AdminID
.........
3. ParentContactID
Fname
StudID
4. CycleNO
cycname
.....
5. DisciplineID
Discname
CycleNo
StudID
.......
6.SubjectID
subName
DiscID
....
7. ExamID
examdate
StudID
8. Results
StudID
ExamID
mark
......
I have a feeling this relationship, is still a bit messy?
I also need to keep track of students daily class attendance, at the end of the tern, or year to find out how many students dropt out of a particular class etc. Is this a new table?
thanks in advance.
haag
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Dec 15, 2004
I have been reading up on normalizing table structures. I have this database that I am working on, to work as a hiring database. It should hold information about people applying to the law firm I work at.
I am looking for advice on if this table structure is normalized and sound. I am also looking for specific help on creating good forms.
Thanks for any help that can be given!
ps. I am attaching a zip that has a jpg view of the tables and their relationships, as well as the db with the table structure.
I would love any and all advice. I want a very clear concept for this db before I do anything!
Thanks again!
:D
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Apr 27, 2005
I was having a discussion with a friend of mine about this... and I couldn't come up with the best explination. Hopefuly someone here can point me in the right direction.
He has a table
Recipies(Id, name, item1, quantity1, item2, quantity2, item3, quantity3, item4, quantity4)
I don't believe that this is the proper way to create a table. What happens if you happen to come across a Recipie that needs 6 items?? or more??
After researching it, I believe it violates 2NF. Is this correct?
Instead I think a better structure would be
Recipies(Id, name)
RecipiesIngredients(Recipies.ID, Ingredients.ID, quantity)
Ingredients (Id, Name)
The problem my friends sees with this method is the fact that the Xref table will get giant.
In the example... Speed is of utmost importance, as the tables will most likely contain thousands of records and be queried against frequently.
Thanks for any input.
-Mike
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Aug 27, 2005
hello this is my 1st posting....... :o
please help me .........
I have 3 tables.....
Table : Customers
CustomerID
CustomerType (i.e. 1st Allottee, 2nd Allottee etc.)
Name
Address
C/o
...
Table: Apartments
File# (every apartment has unique file#)
Category
App#
Level
Area
Price
Discounted (yes/no)
DiscountRate %
...
Table: Receipts
Rec#
RecType (Down Payment, 1st Installment, 2nd Installment...)
Ref
Date
Chq#
Amount
...
one customer can have more than 1 apartments, and one apartment can be transfered to another customer (file# same but customerID changed)
one customer is paying different types of payments against his apartment.
please help me to manage tables and relationships.
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