RE: Single Code Table or Separate Code tables dilemma

A 'single' code table is something that Gurry and Corrigan favor as a performance enhancement.

I have not tried it myself; I feel about it as you do. If I were trying to wring every last bit of performance out of an app though, I would probably give it a shot.

Jared

On Fri, 23 Mar 2001, Jacques Kilchoer wrote:

> I hate to be picky, but I don't like either of the solutions proposed below.
> For the first solution, that means that I would have to have the repeating
> values 'SPLT' and 'TYPE' in every row of the DOCTOR table, which is a table
> with a lot of rows in it.
>
> For the second solution, I have to have a table that contains every possible
> combination of SPLT and TYPE.
>
> Both solutions seem to be wasteful and clumsy. Please don't take this as a
> direct criticism of you, but I still don't see how a single code table can
> be implemented well using FK relationships.
>
> > -----Original Message-----
> > From: Mandar Ghosalkar [mailto:MandarG_at_gsr-inc.com]
> >
> > CREATE TABLE I_DONT_LIKE_MASTER
> > ( CODE_TYPE VARCHAR2(4) NOT NULL,
> > CODE_VALUE VARCHAR2(3) NOT NULL,
> > CODE_DESC VARCHAR2(20) ,
> > PRIMARY KEY (CODE_TYPE, CODE_VALUE) )
> >
> > SPLT N SDFLJDSL
> > SPLT FP SDFSDKFDS
> > SPLT OBG SFLSDJFSD
> > TYPE MD SDFLSDFSDF
> > TYPE FP SDFJDSFJ
> > TYPE OPH SDLFJDSKF
> >
> >
> > CREATE TABLE DOCTOR
> > (.....,
> > SPECIALITY_CODE_TYPE VARCHAR2(4),
> > SPECIALITY_CODE_VALUE VARCHAR2(3),
> > TYPE_CODE_TYPE VARCHAR2(4),
> > TYPE_CODE_VALUE VARCHAR2(3),
> > .....,
> > foreign key (SPECIALITY_CODE_TYPE,SPECIALITY_CODE_VALUE) references
> > I_DONT_LIKE_MASTER,
> > foreign key (TYPE_CODE_TYPE, TYPE_CODE_VALUE ) references
> > I_DONT_LIKE_MASTER )
> >
> > D1 SPLT N TYPE OPH
> > D2 SPLT N TYPE MD
> >
> >
> > but u can also create surrogate key and make (CODE_TYPE,
> > CODE_VALUE) as
> > alternate key (unique) and then reference the surrogate key
> > in ur doctor
> > table, instead of two cols as one foreign key
> >
> > -----Original Message-----
> >
> > I have a table called DOCTOR that has two fields - SPECIALTY
> > and TYPE.
> > The acceptable values for SPECIALTY are N, FP, OBG, etc...
> > The acceptable values for TYPE are MD, FP, OPH, etc...
> > If I have a "single code table", how can I create a Foreign
> > key constraint
> > on the SPECIALTY column and another one on the TYPE column?
>

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Author: Jared Still
  INET: jkstill_at_cybcon.com

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