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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Implementing different document types with different attribut
i like it Jack. just 1 more suggestion - from reading a little more into
the thread. i think he may also want another table to hold values for the
attributes that go with each doc type. this might do it:
Table Doc_Types
Doc_Type_ID Number PK
,Doc_Type_Descr VarChar2(100)
Table Doc_Attributes
Doc_Attrib_ID Number PK
,Doc_Attrib_Descr VarChar2(100)
Table Doc_Type_Attributes ("Intersect" table of the above two)
Doc_Type_ID Number PK and FK to Doc_Types
,Doc_Attrib_ID Numter PK and FK to Doc_Attributes
Table Documents
Doc_ID Number PK
,Doc_Type_ID Number FK to Doc_Types
,Doc_Descr VarChar2(100)
,Doc_Body BLOB (store this segment out-of-line
somewhere)
Table Doc_Attrib_Values
Doc_ID Number PK and FK to Documents
,Doc_Attrib_ID Number PK and FK to Doc_Attributes
,Doc_Attrib_Value VarChar2(100) (or whatever type sufficiently stores
all possible values for all attributes)
you might also want a constraint on Doc_Attrib_Values to be sure that only attributes with rows in the Doc_Type_Attributes table may be inserted.
TMTOWTDI
-----Original Message-----
[mailto:JApplewhite_at_austin.isd.tenet.edu]
Sent: Thursday, August 07, 2003 2:15 PM
To: Multiple recipients of list ORACLE-L
attributes
Tim,
How about this?
Table Doc_Types
Doc_Type_ID Number PK
,Doc_Type_Descr VarChar2(100)
Table Doc_Attributes
Doc_Attrib_ID Number PK
,Doc_Attrib_Descr VarChar2(100)
Table Doc_Type_Attributes ("Intersect" table of the above two)
Doc_Type_ID Number PK and FK to Doc_Types
,Doc_Attrib_ID Numter PK and FK to Doc_Attributes
Table Documents
Doc_ID Number PK
,Doc_Type_ID Number part of FK to
Doc_Type_Attributes
,Doc_Attrib_ID Number part of FK to
Doc_Type_Attributes
,Doc_Descr VarChar2(100)
,Doc_Body BLOB (store this segment out-of-line
somewhere)
This way you can have as many Doc Types and Attributes as you want and never have to modify table designs if you add or remove some. Also, no blank columns.
Jack C. Applewhite
Database Administrator
Austin Independent School District
Austin, Texas
512.414.9715 (wk)
512.935.5929 (pager)
JApplewhite_at_austin.isd.tenet.edu
"Vernaillen Tim"
<tim.vernaillen_at_x To: Multiple recipients
of list ORACLE-L <ORACLE-L_at_fatcity.com>
gs.be> cc:
Sent by: Subject: Implementing
different document types with different attributes
ml-errors_at_fatcity
.com
08/07/2003 08:34
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
-- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: INET: JApplewhite_at_austin.isd.tenet.edu Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). -- Please see the official ORACLE-L FAQ: http://www.orafaq.net -- Author: STEVE OLLIG INET: sollig_at_lifetouch.com Fat City Network Services -- 858-538-5051 http://www.fatcity.com San Diego, California -- Mailing list and web hosting services --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).Received on Thu Aug 07 2003 - 15:09:30 CDT
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