What do people here think about Date's updatable view rules?
http://www.dbdebunk.com/page/page/1270150.htm
Marshall

I was thinking about the relationship between operations of the
relational algebra and SQL statements.
INSERT is a lot like union, but with an odd restriction that the
intersection of the new set and the existing set must be empty. (Why?)

How can one begin to represent the following tuple so that a program
could processing it more intelligently:
T_StudentActivityScore
Student Activity Score

From the benchmarks I've seen over the years, it seems
like the two most "generally fast" dbms are Oracle and
MySQL, where "generally fast" doesn't really mean anything
if you look closely but you all know what I mean anyway.

In relational theory, everyone seems to be talking about modelling
"data", but I've never seen an explanation of what "data" is. As far as
I can tell, C&D took this philosophical concept of "data", and then
built their relational theory on top of it. That's okay. We have a

I recently visited the comp.databases.object ng, and it has become a virtual
ghost town.  What happened?  Such a contrast to the long-running, vibrant
debates so common a year or two ago.
I noticed Bob Badour stopped contributing in mid-March and then traffic,

Lately we've been discussing 1NF and "a question for Mr. Celko."
There are clear incompleteness problems associated with allowing
the definition of set A to references the definition of set A. What
are some of the other problems with using HOL as a basis for

I'm building a grade book program in MS-Access but I ran into a dilemma
regarding circular relationships.
* Courses have Activities.
* Activities have SubActivities.

Given a set of 3D points what is the volume of their convex hull?
http://www.math.niu.edu/~rusin/known-math/95/volume.poly
gives basic idea how to calculate a volume if we know polyhedron
triangulation.

At the last SIGMOD conference I heard an anecdote about how Jim Gray had
gained the respect of some of his colleagues by computing the
convex hull of a set of three-dimensional points in a table with a single
SQL query that used only basic SQL (SQL-89). To be a little more concrete,

What do you think about this?
http://research.microsoft.com/Comega/
http://www.cl.cam.ac.uk/~gmb/Papers/vanilla-xml2003.html
http://research.microsoft.com/users/schulte/Papers/UnifyingTablesObjectsAndDocum
ents(DPCOOL2003).pdf

Database newbie question:
My sample database (T-SQL syntax):
CREATE DATABASE sample
GO

In what way is "navigation" different from using relational operators ?
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