If the code is unique its not a problem. Only part that can give trouble is u r allowing to update code in reftable . That's not coool .
----- Original Message ----- To: "Multiple recipients of list ORACLE-L" <[EMAIL PROTECTED]> Sent: Monday, January 06, 2003 12:03 PM > > I am designing some tables to store Customer Support Data. > The main table (SUPPORT_DATA) contains many (up to 15) foreign key links to > other tables. > Most of the other tables are small lookup REFTABLES (eg Priority Type). > A few bigger tables store up to 1000 records eg CUSTOMER_DATA. > > I am concerned that to get data for one Support record will involve a join > of 15 Tables and possibly more for reports, and that this many tables may > confuse the Cost Based Optimiser. > > I am considering storing the CODE in the SUPPORT_DATA table instead of the > ID for the reference tables. This will reduce the number of joins greatly. > > _____________________________________ > Design Proposed > > SUPPORT_DATA > Id (PK) > <reftable>_code (FK) > support_data_desc > .... > > <REFTABLE> > <reftable>_id (PK) > <reftable>_code (Unique Constraint) > <reftable>_description > _____________________________________ > > The Main problems I see with this are that DATA storage increases (I can > deal with that) and that I will have to create a trigger to update all > SUPPORT_DATA if one of the CODES in a REFTABLE is updated (this would be > rare and so not a great concern). > > Is storing the CODE a sound option? > Any hints or comments would be appreciated =) > > THX Greg > -- > Please see the official ORACLE-L FAQ: http://www.orafaq.net > -- > Author: Gregory Norris > INET: [EMAIL PROTECTED] > > 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: [EMAIL PROTECTED] (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: BigP INET: [EMAIL PROTECTED] 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: [EMAIL PROTECTED] (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).
