I have read and looked around at what others have done in Spatial DB but there's one type of query which I have
not seen people working on yet. If you all have seen this in any research projects or products, please share
with us.
In particular, I'm looking for support for queries ...

Wir besprechen zur Zeit in der Computer-Chemie RHF und UHF Rechnungen
und haben als Aufgabe rauszufinden, bei welchen Molekülen
wahrscheinlich der grösste Unterschied zwischen der RHF und der UHF
Rechnung besteht. Hat jemand von euch ne Idee welche Moleküle des sein

I consider the SQL "insert" statement. It doesn't look like
a primitive to me; it seems like a special case of the union
operator.
But maybe not:

It's been a while since I followed that course in college on database
theory and my ER diagram skills are a bit rusty, I was hoping some of
you might be willing to help me out.
I'm setting up a database, where, among others, I have the following

I have read and looked around at what others have done in Spatial DB
but there's one type of query which I have
not seen people working on yet. If you all have seen this in any
research projects or products, please share

i am experimenting on the online tool, SQLcourse 2 tutorial, and have
entered the following query,
SELECT lastname, item, quantity, price
FROM items_ordered, customers

If this is the wrong place to post this, I apologize.
I am having a problem that I just can't seem to wrap my brain around
regarding tables and their data.  Part of the problem is that
I am not sure I can even articulate the question, but here goes.

Back in the seventies, (I was doing IMS database design) I saw somewhere
a naming convention for attributes.
It was in the form a_b_c_d
where 'a' was a 1 character code describing the attribute type.

Hello
I need some guideline in implementing Concurrency Control in a
Clustered Web Application.
We are in the process of building a web application and we are now

Anyone got any ideas what could cause this problem?
I have recently had a site suspended by a hosting company.
They have told me that "scripting is causing a large (900mb) temp file on
the server"

I'm sure we cannot get unanimous agreement on this, but can we get a good
statement of what it is we are trying to accomplish with a data model?
For example, it seems that some are asking a question such as "What
mathematical model for structuring data is the simplest we can find ...

I've heard this a few places. A type is a set of values with operators.
A relation is a set of values (tuples) with operators. While viewing a
relation as a type seems pretty unenlightening, I don't see why it's
outright *wrong*. Can anyone illuminate me?

Marshall agreed with me on something, so I'll dare post one of the many
questions I have related to relational database theory.
In Date's June 2003 paper entitled "What First Normal Form Really Means" he
asks questions about MultiValue systems, which he (and no one else I've

I want to have a data validation rule that defines a pattern (in
regular expression if possible) for phone numbers. Only phone numbers
that matches this pattern should be possible to insert into the
database.