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Thread Starter | Last Post  | Replies | Views |
 |  | Like most people around here, I periodically return to the view update
problem. I also subscribe to the idea that relational databases...
Sampo Syreeni
|
10-05-2009 01:31 PM
rpost  | 2 | 149 |
 | | I'm new to relational theory, having read a C.J. Date's book but I worry
that I may have picked up mistaken impression about the relational
theory...
Banana
|
10-01-2009 08:28 PM
David BL | 42 | 468 |
| | | On Jul 23, 6:43 pm, Nilone <rea... (AT) gmail (DOT) com> wrote:
I'm associating OO with *any* approach (however carefully formalised)
that involves...
Walter Mitty
|
09-30-2009 02:22 AM
Clifford Heath | 123 | 1,753 |
| | | I have a situation that is somewhat the opposite of the case in which
you would use ON DELETE CASCADE on a foreign key in a child table to
ensure...
cm
|
09-30-2009 12:12 AM
Brian | 8 | 142 |
| | | I am trying to get a top-down understanding of what an RDBMS does to
go
from a SQL Query to actual data (records served up).
Your thoughts / Links...
David
|
09-14-2009 12:22 PM
Hugo Kornelis | 2 | 229 |
| | | Regarding so-called "union compatibility",.suppose relations A and B
with equal headings, say named h. Suppose non-empty relation U with
only one...
paul c
|
09-12-2009 11:00 PM
paul c | 3 | 290 |
| | | Suppose we have views u, w defined as relational expressions over base
tables x, y, z:
u = f(x,y,z)
w = g(x,y,z)
Let's assume this system of...
Tegiri Nenashi
|
09-12-2009 05:22 AM
paul c | 10 | 265 |
| | | Not sure what to make of this:
USPTO Application #: 20080222602
Title: Declarative object identity using relation types
Abstract: The present...
Nilone
|
09-10-2009 01:45 AM
vldm10 | 1 | 141 |
| | | Why do implementation languages not allow this? Surely not for logical
reasons? We can delete from projection because NOT Pa implies NOT Pab,
eg.,...
paul c
|
09-08-2009 08:39 AM
Brian | 29 | 599 |
| | | I had a though about possreps the other day, and I wanted to post
it, for no particular reason. This thought is not much developed,
so don't expect...
Marshall
|
09-06-2009 09:42 AM
none | 9 | 179 |
| | | On Sep 1, 8:12*am, Kevin Kirkpatrick <kvnkrkpt... (AT) gmail (DOT) com> wrote:
Do you have anything to justify these requirements? They
sound like...
paul c
|
09-03-2009 07:34 PM
paul c | 117 | 1,324 |
| | | Vadim Tropashko wrote:
I must admit that relational lattices sound rather scary to me; but maybe
some further reading on the subject could cure...
Troels Arvin
|
08-26-2009 10:00 AM
Vadim Tropashko | 4 | 246 |
| | | Bob Badour wrote:
Given a relation with a key K1, ... Kn and remaining attributes
L1, ... Lm, that relation is always the join of the m...
rpost
|
08-25-2009 09:09 AM
Walter Mitty | 16 | 481 |
| | | He has turned his course text into a free book at:
http://bookboon.com/uk/student/it/an-introduction-to-relational-database-theory
It is rather...
paul c
|
08-22-2009 02:26 PM
paul c | 0 | 136 |
| | | Hi,
I'm looking for a solution for the following scenario:
- System running on multiple servers (could be dozens)
- Each server is running IIS and...
Docco
|
08-17-2009 11:05 PM
toby | 2 | 157 |
| | | "paul c" <toledobythesea (AT) oohay (DOT) ac> wrote
I like this war story. I salute you, old timer.
I was once an assembly language type myself....
Walter Mitty
|
08-17-2009 05:11 PM
Walter Mitty | 70 | 892 |
| | | I'm looking for any references, discussion or theory about
hierarchical models for situations such as residential addresses,
geopolitical...
Nilone
|
08-17-2009 05:14 AM
Nilone | 8 | 284 |
| | | Walter, you've really got me going today. Here's more oversell from the
www originator...
paul c
|
08-11-2009 05:35 PM
none | 2 | 148 |
| | | vldm10 wrote:
I doubt if I would get the drift of the rest of your message no matter
how hard I tried, so I snipped it, but would like to ask if...
paul c
|
08-10-2009 01:09 PM
rpost | 14 | 432 |
| | | Apologies for cross-postings. Please send to interested colleagues and
students
-- CALL FOR PAPERS - Deadline for submissions (2nd Call): 21...
natty2006@gmail.com
|
08-10-2009 08:29 AM
natty2006@gmail.com | 0 | 139 |
| | | Since the entity integrity rule ensures that a relational table cannot have
any duplicate rows, does that imply that each row in a table maps to...
Mr. Scott
|
08-09-2009 09:18 PM
Mr. Scott | 52 | 794 |
| | | Hi all,
It's my shameless self-promotion minute. My latest video is
up on YouTube. If you ever thought one of my posts was
funny, maybe this'll make...
Marshall
|
08-08-2009 10:43 AM
Bob Badour | 1 | 142 |
| | | Is there "genuine" disagreement on what 1NF, 2NF and 3NF mean? Or is
the variety of contradictory in-print definitions of Normal Forms due
to sloppy...
dana
|
08-07-2009 10:56 PM
paul c | 9 | 240 |
| | | Please take a look at my new website and use the contact us feature to
provide feedback on the website that I will be deploying in
September. ...
MSpight@gmail.com
|
08-06-2009 12:29 PM
Bob Badour | 1 | 292 |
| | | 1) Are there competing UML Data Modeling profiles (for relational
databases) or is only one being considered? One of Scott's articles
mentions that...
dana
|
08-05-2009 07:56 AM
Alfredo Novoa | 3 | 158 |
| | | On Jun 10, 3:22 pm, cim... (AT) hotmail (DOT) com wrote:
Greetings Cimode,
It's been about 3 years since you and I last "interacted" to any
great...
dr.coffee1@gmail.com
|
08-04-2009 06:13 PM
rpost | 182 | 1,173 |
| | | On Jul 24, 9:14*am, paul c <toledobythe... (AT) oohay (DOT) ac>...
Hans Mayr
|
07-29-2009 09:14 AM
Cimode | 32 | 441 |
| | | Consider a requirement to record electronic circuits in a relational
database. Circuits are abstract mathematical objects (i.e. "values")
independent...
David BL
|
07-28-2009 04:51 PM
none | 39 | 495 |
| | | Hello,
I have the following situation.
I get an csv file from an other application daily and put it in an
mysql DB, what is not a problem.
the csv...
Ralf Hackmann
|
07-27-2009 10:13 AM
Bob Badour | 1 | 117 |
| | | A quote from Experts Exchange...I let you judge for yourself...
<<
Just to clarify, the fact that I have duplicates isn't a problem --
the problem...
Cimode
|
07-22-2009 02:08 PM
Walter Mitty | 2 | 116 |
| | | I'm doing a little research into database metadata for various
products like DB2, Oracle, SQL Server, and MySQL. I want
to learn about where...
Digital Puer
|
07-22-2009 12:31 AM
jefftyzzer | 4 | 122 |
| | | Apologies for cross-postings. Please send to interested colleagues and
students
-- CALL FOR PAPERS - Deadline for submissions (extension): 31...
natty2006@gmail.com
|
07-21-2009 04:38 AM
natty2006@gmail.com | 0 | 80 |
| | | A brilliant man (Erik Naggum) recently passed away far too young.
During a nostalgic reading of some of his posts and works related
to him, I have...
Keith H Duggar
|
07-21-2009 01:26 AM
Frank Hamersley | 13 | 261 |
| | | A nice example on a dead end met by a BI developper when he tried to
maintain data integrity through application. Coming from a SQL Server
forum...I...
Cimode
|
07-17-2009 10:15 AM
Cimode | 0 | 87 |
| | | This is an extract from a board forum where I regularly participate to
try to help other fellows about SQL. I have to admit that by the end
of this...
Cimode
|
07-16-2009 03:12 PM
TroyK | 2 | 139 |
| | | "Walter Mitty" <wamitty (AT) verizon (DOT) net> wrote
In a wonderful illustration of reality and illusion, my newsreader took the
close...
David BL
|
07-16-2009 01:23 AM
Bob Badour | 62 | 717 |
| | | I'm confused about some recent trends in database design.
When I learned databases, about a quarter of a century ago, the preferred
practice was to...
Walter Mitty
|
07-06-2009 01:21 PM
Roy Hann | 81 | 914 |
| | | hi all,
i saw an explanation of junction table here:-
http://megocode3.wordpress.com/2008/01/04/understanding-a-sql-junction-table/
how correct is...
annalissa
|
07-05-2009 09:05 AM
Brian Selzer | 1 | 114 |
| | | Hello,
I was analyzing the problem of logic in connection with ranges like a
price for a certain article which is valid from a certain date till...
Hans Mayr
|
07-01-2009 12:54 PM
Kevin Kirkpatrick | 7 | 97 |
| | | As the subject says...
The traditional direct image system approach consists of having
relations constraints implemented at the time when the...
Cimode
|
06-20-2009 03:30 PM
Brian Selzer | 7 | 86 |
| | | Hi,
i'm nearly ready for my first release of my new concurrent, multi-
threaded, ACID transactional, logical idempotent logging, lock-free
database...
Christoph Rupp
|
06-18-2009 07:02 PM
--CELKO-- | 7 | 96 |
| | | Lately, I stumbled about the problem of how constraints are to be
implemented in the case of relations runtime-only (I call them virtual
- they can...
Cimode
|
06-16-2009 03:44 AM
Cimode | 21 | 240 |
| | | Instead of contributing to the metadiscussion going on in another thread, I
decided to start a new one.
As a discussion starter, I'm referring you...
Walter Mitty
|
06-16-2009 03:26 AM
Walter Mitty | 0 | 140 |
| | | I want to make an array of RGB colors. For the set ( 0, 64, 128, 192,
255 ), I want to have each combination thereof ( the Cartesian
product? )...
lawpoop
|
06-14-2009 09:38 AM
--CELKO-- | 5 | 121 |
| | | On Jun 6, 11:43 am, cim... (AT) hotmail (DOT) com wrote:
Share many of your sentiments:
http://arxiv.org/abs/0902.3532
Page 5 documents four...
cimode@hotmail.com
|
06-13-2009 03:22 PM
Vadim Tropashko | 16 | 160 |
| | | Bob Badour wrote:
Jan, I appreciate you are very busy and no longer have time for c.d.t.
Ordinarily, I would not ask for any of your time.
When...
Bob Badour
|
06-13-2009 11:24 AM
Bob Badour | 0 | 117 |
| | | "Brian Selzer" <brian (AT) selzer-software (DOT) com> wrote
?
Walter Mitty
|
06-12-2009 09:31 AM
Brian Selzer | 50 | 906 |
| | | As a second joke of the week...Here is a decent attempt at
incorporation of database design as a part of the gaming industry...A
sign of our time...I...
cimode@hotmail.com
|
06-10-2009 12:19 PM
Walter Mitty | 2 | 113 |
| | | Hello,
I wondered if the DEFAULT clause along with the NOT NULL, PRIMARY KEY
clauses in a CREATE TABLE statement was a constraint.
Is it?
I think...
Karsten Wutzke
|
06-09-2009 10:52 AM
Philipp Post | 1 | 110 |
| | | On Jun 5, 3:58*am, robu... (AT) gmail (DOT) com wrote:
For a philosophical take on this issue of...
Walter Mitty
|
06-09-2009 01:35 AM
Joe Thurbon | 28 | 361 |
