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Re: Storing number '001' ?

From: "Josh Berkus" <josh(at)agliodbs(dot)com>
To: Charles Hauser <chauser(at)acpub(dot)duke(dot)edu>
Cc: pgsql-novice(at)postgresql(dot)org
Subject: Re: Storing number '001' ?
Date: 2001-12-13 21:01:20
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-novice

> Attached is my draft of a schema.

Hey, I like this!  What software did you use to generate it?  I
currently lack a diagramming tool that produces JPGs.
> I believe I was in error yesterday, when I stated that the 
> relationship between the clone tables was one to one.  It is true 
> that a clone has 1 and only 1 sequence, but a sequence exists for 1 
> or more clones(TABLES clone_fasta and clone_qual).

See below.  This changes our schema.
> I am working my way thru Database Design for Mere Mortals, and 
> another book, Relational Database Design Clearly Explained by J.L. 
> Harrington.

I would appreciate a 1-paragraph review of the latter book for the
bookreviews page when you're done with it.
> In practical terms I don't understand how to deal with the FKs.  For
> example:
> CREATE TABLE clone_fasta(
> clone_fasta_id SERIAL PRIMARY KEY,
> clone_id INTEGER NOT NULL REFERENCES clone(clone_id) ON DELETE
> );

The problem is that, according to your new diagram, our parent-child
relationship is backwards.  The clones table should contain FKs to
clone-fasta and clone-qual instead of what we have now.  If you can give
me a better description of where the fasta and qual information comes
from, and what order it's entered in, we can tweak the schema to match.


P.S. List readers, I apologize for omitting the diagram but it's 150K.

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