VBA for Primary Key

  • Thread starter Thread starter Frank Situmorang
  • Start date Start date
F

Frank Situmorang

Hello,

Since a multifield primary key is more comlicated to use, therefore I plan
to have a surrogate/ 1field PK, but with the automatic fill by the VBA as
follows

1. 2 first digit will be Division ID
2. 2 next digits will be Union ID
3. 2 Next digits will be Regional ID
4. 3. Next digits will be Church ID
5. the rest will be increment by 1

So if my church has the following hierarcchy:
DvisionID: 1
Union ID : 2
Regional ID:3
ChruchID ID;4
Household/AddressID: incrment by 1, this is the first record.

What is the VBA if I would like it to show up like this:
01_02_03_004_1

I apreciate your help
 
hi Frank,

Frank said:
Since a multifield primary key is more comlicated to use, therefore I plan
to have a surrogate/ 1field PK, but with the automatic fill by the VBA as
follows
Click to expand...
So if my church has the following hierarcchy:
DvisionID: 1
Union ID : 2
Regional ID:3
ChruchID ID;4
Household/AddressID: incrment by 1, this is the first record.

What is the VBA if I would like it to show up like this:
01_02_03_004_1
Click to expand...
Yuck. This is redundancy at its best. Normally you should have this
structure using surrogate keys:

Division: ID, ...
Union: ID, Division_ID, ..
Region: ID, Union_ID, ..
Church: ID, Region_ID, ..

The key concept of surrogate keys is about _not_ to carry any information.


mfG
--> stefan <--
 
Thanks Stefan for your response. Let me tell you that the purpose of this is
to keep the address of the member PK alwasy unique when we cosolidated the
data in the upper level of organization or office.

The very low level office is local church, then chruch will send it;s member
data to higher office which is regional to consolidate data of all churches
on its region. Then Regional officie will send it's data to higher level
office wchich is Union Office...and so forth upto Division Office..and
consolidated all divisions to have the world total members.

In any of the level office, the address is always unique, therefore we know
the addresses of the members when we consolidated it.

But if we do not do like that, let me show you the sample, Address Mr. A in
church P will start with the number 1, then when I give the blank database to
church Q and the address of Mr. B will also start wtih number 1. When both
chrurches sent their data to regional office, the primary key will
conflict./duplicate. We can not assume to have it with the next number in the
regional office, but it is already said number 1 also in the Foregn Key of
the members table.

Thanks for your idea, if you stil can help me plasea. I am just a self
study, my specailty is accountancy
 
hi Frank,

Frank said:
The very low level office is local church, then chruch will send it;s member
data to higher office which is regional to consolidate data of all churches
on its region. Then Regional officie will send it's data to higher level
office wchich is Union Office...and so forth upto Division Office..and
consolidated all divisions to have the world total members.
Click to expand...
So you have

Division: ID, ... PK(ID)
Union: ID, Division_ID, .. PK(ID)
Region: ID, Union_ID, .. PK(ID)
Church: ID, Region_ID, .. PK(ID)
1, 1, "Church P"
1, 2, "Church Q"

as invariant structural tables.

Your local offices fill data in your address table:

Address: ID, Church_ID, ...
But if we do not do like that, let me show you the sample, Address Mr. A in
church P will start with the number 1, then when I give the blank database to
church Q and the address of Mr. B will also start wtih number 1. When both
churches sent their data to regional office, the primary key will
conflict./duplicate.
Click to expand...
Address (Church P): 1, 1, "Mr. A"
Address (Church Q): 1, 2, "Mr. B"

The surrogat key ID in church is sufficent for your local office, but
when you are consolidating the data your are copying data into another
structural scheme which has _other_ primary keys. For the table Church
it is then a combined key consisting of ID and Region_ID or you need an
other table to hold the consolidated data:

Address (Consolidated): ID, Original_ID, Church_ID, ...

Depending on your needs you may consider using a GUID as unique id, e.g.

http://www.devx.com/dbzone/Article/10167/0/page/3


mfG
--> stefan <--
 
I would highly recommend you use an Autonumber primary key. All the other
fields now included should just be constrained to require a valid value.
 
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