dbTalk Databases Forums  

Sponsored Links


comp.databases.theory comp.databases.theory


Discuss in the comp.databases.theory forum.



Post New Thread
Threads in Forum : comp.databases.theory Forum Tools
  Rating Thread / Thread Starter Last Post Reverse Sort Order    Replies         Views     
"Joe Thurbon" <usenet (AT) thurbon (DOT) com> wrote I once wrote a little program to play Mastermind (a code guessing game) using entropy to...
David Cressey
01-12-2008 04:17 AM
David Cressey Go to last post
16 102
Hi I am trying to find out how you deal with variable prices, so when I query * I don't get * . Is there a rule of thumb for this type of...
graeme
01-11-2008 07:30 AM
David Cressey Go to last post
8 59
Hi, In the past I have always made the relationship between two tables using foriegn keys. So, to link employee to employer I would have a column in...
bissatch@yahoo.co.uk
01-11-2008 12:28 AM
David Cressey Go to last post
48 293
I need help in understanding what is an automorphism of a database instance. The following definition is from the book Relational Database Theory...
Kira Yamato
01-10-2008 10:25 AM
Jan Hidders Go to last post
124 793
Hello , can you help me please to analyse this situation and choose an appropriate design for that The prloblem /...
tears
01-09-2008 01:14 PM
rpl Go to last post
24 171
NULLs (Multi-page thread 1 2 3 4 5 ... Last Page)
What are NULLs for? Missing information? Then surely there should just be no tuple? To indicate that there can be no value? Why not a seperate...
stevedtrm
01-08-2008 03:20 PM
Sampo Syreeni Go to last post
332 4,951
Hello , can you help me please to analyse this situation and choose an appropriate design for that The prloblem /...
tears
01-08-2008 03:12 PM
TroyK Go to last post
16 139
I'm a newbie to dB programming. I set up a set of tables (see below after the RL signoff) to capture the relationship between a group of people...
raylopez99
01-01-2008 09:13 PM
Gene Wirchenko Go to last post
33 722
On 9 dec, 22:10, JOG <j... (AT) cs (DOT) nott.ac.uk> wrote: But that is what I'm saying, isn't it? These sets of properties are part of your model...
David Cressey
12-31-2007 08:48 PM
mAsterdam Go to last post
124 2,158
Hello: I am trying to learn SQL and RDBMS theories. To acheive this, I decided to assign myself a project. My project is basically, account for my...
magawake
12-27-2007 12:02 PM
Rob Go to last post
8 291
My beginner's book on RDBMS theory by Louis Davidson (APress) says that there's a trend towards using GUIDs (artificial keys) as computing power...
raylopez99
12-27-2007 06:13 AM
rpl Go to last post
19 386
On Dec 4, 6:13 pm, rp... (AT) pcwin518 (DOT) campus.tue.nl (rpost) wrote: Fair enough :) I still think if you examine this again you'll see it...
Phil Reynolds
12-26-2007 12:54 PM
JOG Go to last post
168 2,841
I'm getting the hang of database architecture design I think, along with easy to code, drag-and-drop Access 2003 forms programming--great front...
raylopez99
12-26-2007 03:43 AM
rpl Go to last post
31 742
It's time for me to ask another dumb question. The term "data sublanguage" appears in Codd's 1970 paper. I kind of glossed over it when I first...
David Cressey
12-25-2007 12:10 PM
Knowledgy Go to last post
5 320
http://www.idera.com/Simon/ How would you like Simon's job?
David Cressey
12-22-2007 07:45 AM
Tony Rogerson Go to last post
4 312
Just wondered if anyone had seen this: http://www.regdeveloper.co.uk/2007/12/17/amazon_simpledb/ While in principle a globally accessible database...
JOG
12-21-2007 08:56 PM
Lon Stowell Go to last post
9 300
sorry to bug you but... if i want to define a datum in terms of who owns what, what branch of IM is it ? (yes i know it's not a computer-bound...
rpl
12-19-2007 11:41 PM
rpl Go to last post
2 295
Suppose I want to create a schema for S = student, J = subject, T = teacher, that enforces 1) For each subject, each student taking that subject is...
Kira Yamato
12-15-2007 07:42 PM
Brian Selzer Go to last post
10 517
OK, this is about my fifth day doing databases, and I've read about 1NF, 2NF, 3NF here:...
raylopez99
12-15-2007 10:48 AM
raylopez99 Go to last post
10 455
Hi, It seems to be a common enough problem, but it doesn't seem to ever be properly addressed in data modelling books, and from reading on the web...
d-42
12-14-2007 06:51 PM
-CELKO- Go to last post
6 310
raylopez99 wrote: You are confusing logical and physical issues. For example, if all of the 'dependent' or 'downstream' relations are physically...
Bob Badour
12-14-2007 04:40 PM
Bob Badour Go to last post
2 316
In paper "Independence of Logic Database Queries and Updates" by C. Elkan it is proven that for logical databases query independency from updates...
silentser@gmail.com
12-14-2007 10:23 AM
silentser@gmail.com Go to last post
4 374
On Dec 6, 7:54 pm, paul c <toledobythe... (AT) ooyah (DOT) ac> wrote: Well, if nothing else, we can certainly consider relation constants. DUM and...
Tegiri Nenashi
12-12-2007 08:17 PM
V.J. Kumar Go to last post
28 505
http://www.amazon.com/Handbook-Relational-Database-Candace-Fleming/dp/0201114348/ref=pd_bbs_sr_1?ie=UTF8&s=books&qid=1197329088&sr=1-1 I know this...
Evan Keel
12-12-2007 07:18 PM
Brian Selzer Go to last post
5 337
Valentina Office Server, Valentina Embedded Server and the free Valentina Community Server for Linux now support custom database properties, some of...
Lynn
12-07-2007 05:57 PM
Bob Badour Go to last post
1 248
On 6 Dic, 17:21, paul c <toledobythe... (AT) ooyah (DOT) ac> wrote: thank you for answering. so, you're saying that, for instance, the effective...
xareon@gmail.com
12-06-2007 06:20 PM
Jonathan Leffler Go to last post
2 275
paul c wrote: I like the "relvar" entry in Wikipedia. Short, but sweet. -- Reinier
David Cressey
12-06-2007 02:26 PM
rpost Go to last post
26 679
paul c wrote: There was a typo in the postal code: H0H 0H0
M.Shariq
12-04-2007 08:31 AM
floronDBA Go to last post
4 275
"paul c" <toledobythesea (AT) ooyah (DOT) ac> wrote A database derived from census data might be about two different subject matters: The first is...
David BL
12-04-2007 05:51 AM
Jan Hidders Go to last post
88 1,369
I'm hoping that someone here can give me some assistance with a database I'm trying to set up. My skills in Access are fairly basic, and I'm trying...
Jeffrey Davis
12-03-2007 09:29 AM
David Cressey Go to last post
13 639
"paul c" <toledobythesea (AT) ooyah (DOT) ac> wrote You jumped in with an attempt to ridicule my (correct, I might add) use of the term...
vldm10
11-30-2007 11:25 AM
JOG Go to last post
50 1,156
On Nov 23, 1:10 am, paul c <toledobythe... (AT) ooyah (DOT) ac> wrote: I understand your point Paul, although I deliberately omitted the whole...
JOG
11-28-2007 07:00 PM
Cimode Go to last post
17 470
If I wanted to start investigating encrypted databases and built-in support for encrypted content in databases, where might I go? I'd prefer to...
Roy Hann
11-26-2007 02:54 PM
Bob Badour Go to last post
6 298
Give me advise please, from what I can start learning database theory?
mp5.misha@gmail.com
11-17-2007 07:43 PM
JAK Go to last post
2 304
On Nov 12, 9:42 pm, paul c <toledobythe... (AT) ooyah (DOT) ac> wrote: No I am saying that too many new Relational Database developeres...
David BL
11-13-2007 07:33 PM
David BL Go to last post
91 1,634
I get XML feeds as input and have to store this data on our server. I have worked with databases but new to XML. Can someone tell me how I can store...
karsoods53
11-11-2007 11:44 AM
Bob Badour Go to last post
33 747
Quoth paul c: What do you mean? That an RVA might have an attribute with the same name as an attribute in the enclosing relation? If you think of...
Bob Badour
11-07-2007 03:13 AM
Jon Heggland Go to last post
59 1,332
This e-book contains over 1,100 pages of information that establish a new paradigm for the integrated Enterprise Data Architecture. It is...
Parker
11-04-2007 05:21 AM
Roy Hann Go to last post
14 427
Hi all, I know it is an old issue and probably boring but please cope with me , it is a real world problem I am facing and I don't really...
Arash
10-31-2007 09:29 AM
Arash Go to last post
2 281
paul c wrote: "Keeping up Appearances" - quite apt for this thread! Especially given the surname is pronounced "bookay" (aka bouquet). Classic...
anjasmedts@hotmail.com
10-31-2007 05:27 AM
Authorised User Go to last post
20 317
Hi all, Let's suppose I'm writing a website where users search for movie titles, and suppose there are 200,000 movies. The site is in...
crazyhorse
10-25-2007 11:06 AM
Patricia Shanahan Go to last post
6 127
In An Introduction to Database Systems, C.J. Date, characterises value, variable and type as follows:- "value" : An "individual constant" - for...
David BL
10-24-2007 11:33 PM
David BL Go to last post
2 135
DB layout is as follows: -------------------------------- 1 ------------------------------- 1
dutone
10-24-2007 01:52 PM
Cimode Go to last post
32 426
"paul c" <toledobythesea (AT) ooyah (DOT) ac> wrote My use of the term "header" might be non-standard. for Table B and for Table C are what I...
Roy Hann
10-19-2007 10:21 AM
Dr. Dweeb Go to last post
26 348
I just got a new job (woohoo). First challegne I face is to build a data model and a data dictionary of all the systems existing in the organisation....
nujcharee@googlemail.com
10-19-2007 12:06 AM
Ed Prochak Go to last post
1 230
On 14 oct, 04:43, paul c <toledobythe... (AT) ooyah (DOT) ac> wrote: involve more than one per relation but the other complications will attract...
Cimode
10-14-2007 12:31 PM
Cimode Go to last post
6 116
I never really took any effort to bother to know what these are until they got in my way in otherwise fine...
Tegiri Nenashi
10-12-2007 03:33 PM
Bob Badour Go to last post
1 118
While working on a db core on these last years, one of the question that gave me most difficulty was what would be an efficient taxonomy to list...
Cimode
10-08-2007 02:36 AM
Jon Heggland Go to last post
4 133
I have a set of predefined constants with a set of predefined relationships and am looking for a way to link them if possible to ensure data...
JamesHoward
10-06-2007 02:55 PM
David Portas Go to last post
5 133
I am developing a database design course for young PHP programmers. Here is why: CREATE TABLE tblShoes( charSKU as Char(10) //first 3 characters...
Evan Keel
10-03-2007 08:19 PM
JOG Go to last post
4 138
Post New Thread

Display Options
Showing threads 301 to 350 of 1741
Sorted By Sort Order
From The
Forum Tools Search this Forum
Search this Forum :

Advanced Search

New posts New posts More than 15 replies or 150 views Hot thread with new posts
No new posts No new posts More than 15 replies or 150 views Hot thread with no new posts
Closed Thread Thread is closed  
 
Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Powered by vBulletin Version 3.5.3
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.