| From: | Jeff Davis <pgsql(at)j-davis(dot)com> |
|---|---|
| To: | Robert James <srobertjames(at)gmail(dot)com> |
| Cc: | Postgres General <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: Relational Algebra and Aggregate Functions |
| Date: | 2009-07-28 01:38:03 |
| Message-ID: | 1248745083.18098.116.camel@monkey-cat.sm.truviso.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-general |
On Mon, 2009-07-27 at 21:05 -0400, Robert James wrote:
> 1) Introduction to Database Systems
> http://www.amazon.com/Introduction-Database-Systems-Kannan-Swamynathan/dp/B001BVYKY4/ref=sr_1_5?ie=UTF8&s=books&qid=1248742811&sr=1-5
>
> and
> 2) Database in Depth: Relational Theory for Practitioners
> http://www.amazon.com/Database-Depth-Relational-Theory-Practitioners/dp/0596100124/ref=sr_1_7?ie=UTF8&s=books&qid=1248742811&sr=1-7
I recommend #2. It's shorter and easier to read than "An Introduction to
Database Systems", and I think it will answer your question about
relational theory and aggregates (see "SUMMARIZE").
Appendix A is a part of "Databases, Types, and The Relational Model: The
Third Manifesto". That's interesting, but it's not an easy read, it's
describing a system in formal detail.
Regards,
Jeff Davis
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Tom Lane | 2009-07-28 01:49:04 | Re: Clients disconnect but query still runs |
| Previous Message | Robert James | 2009-07-28 01:05:42 | Re: Relational Algebra and Aggregate Functions |