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 -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
