You will have some performance problems if you take the
doc_type/doc_attribute approach, plus coding the application will not be
fun.
As another poster noted, flexfields are for Oracle Apps and they are just
the way Oracle apps tries to accommodate a limited amount of customization
to table structures. Essentially, a way to dynamically do COBOL record
types. A no-no for relational systems.
As for the one table approach, as another poster pointed out, disk is cheap,
especially if you're not storing any values in VARCHAR2 fields. Include a
document_type field in the table. To simplify programming, define a set of
views on top of the table which access just those columns applicable to a
particular document type. Since each view is just based on one table, it
will be transparently updateable without coding triggers. In addition, you
will have all the documents in one table for when you have to report on them
all or otherwise process them all.
An alternative model which would also work is to have a subtype-supertype
set-up. That is, you have the columns common to all the tables in one
supertype table, and then join that to separate tables for the sub-types via
an arc implementation of the FKs. This gets you more efficient storage, an
easy way to process all of the document types, plus a pretty easy way to
process an individual document type, by joining the subtype-table with the
supertype-table.
Leslie
-----Original Message-----
Sent: Thursday, August 07, 2003 12:29 PM
To: Multiple recipients of list ORACLE-L
sorry, misunderstood
Invoices:
- Origin
- Form Template ID
- AWB
- Bill To Customer
- Bill To Customer Name
- Invoice #
- Invoice date
- customs Entry #
- entry date
- query handling (boolean)
- cash application (boolean)
- credit & collection (boolean)
- text search (boolean)
- shipment folder (boolean)
Customs Document:
- AWB
- Clearance #
- Customs Entry #
- Entry date
- deferement #
Cash batches:
- query handling (boolean)
- cash application (boolean)
- credit & collection (boolean)
So, you could see, we've more than 50 type of documents and in total those
have more than 70 different attributes (some are the same). There is not one
attribute that appears on every document type!!! I would create so 50 tables
(for each document type 1), but if someone has another suggestion, I would
like to do it in an other way.
-----Original Message-----
Sent: donderdag 7 augustus 2003 16:59
To: Multiple recipients of list ORACLE-L
attributes
Just one or two examples, please.
"Vernaillen Tim"
<tim.vernaillen To: Multiple recipients
of list ORACLE-L <[EMAIL PROTECTED]>
@xgs.be> cc:
Sent by: Subject: RE: Implementing
different document types with different attributes
ml-errors
08/07/2003 10:44
AM
Please respond
to ORACLE-L
attribute is a specific part of an index-file, but those attributes are
different for all document types
-----Original Message-----
Sent: donderdag 7 augustus 2003 16:15
To: Multiple recipients of list ORACLE-L
attributes
What do you have as an example of an "attribute"?
"Vernaillen Tim"
<tim.vernaillen To: Multiple recipients
of list ORACLE-L <[EMAIL PROTECTED]>
@xgs.be> cc:
Sent by: Subject: Implementing
different document types with different attributes
ml-errors
08/07/2003 09:34
AM
Please respond
to ORACLE-L
Hello
I've an installation/implementation question!
We've to analyse 50 document types, in total those 50 has 70 different
attributes. We don't want to put all those document types into one table,
because more than the half (35) of the attributes are not always used for
each document type. This will have to much disk space for each record, if
most of the fields are just blank.
Has anyone suggestions how to build our table-structure?
I've heart something about FlexFields, what are they?
Takes every field diskspace, even if it's blank (null)?
Thanks in advance for the response!
Tim
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