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     
Is there a commercial RDBMS that allows one to create indices on views? I'm asking this partly because of BCNF. A typical BCNF problem is (where...
01-16-2008 02:06 PM
TroyK Go to last post
16 124
"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 03:17 AM
David Cressey Go to last post
16 109
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...
01-11-2008 06:30 AM
David Cressey Go to last post
8 63
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...
01-10-2008 11:28 PM
David Cressey Go to last post
48 319
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 09:25 AM
Jan Hidders Go to last post
124 851
Hello , can you help me please to analyse this situation and choose an appropriate design for that The prloblem /...
01-09-2008 12:14 PM
rpl Go to last post
24 189
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...
01-08-2008 02:20 PM
Sampo Syreeni Go to last post
332 5,119
Hello , can you help me please to analyse this situation and choose an appropriate design for that The prloblem /...
01-08-2008 02:12 PM
TroyK Go to last post
16 153
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...
01-01-2008 08:13 PM
Gene Wirchenko Go to last post
33 741
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 07:48 PM
mAsterdam Go to last post
124 2,205
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...
12-27-2007 11:02 AM
Rob Go to last post
8 296
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...
12-27-2007 05:13 AM
rpl Go to last post
19 388
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 11:54 AM
JOG Go to last post
168 2,909
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...
12-26-2007 02:43 AM
rpl Go to last post
31 764
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 11:10 AM
Knowledgy Go to last post
5 327
http://www.idera.com/Simon/ How would you like Simon's job?
David Cressey
12-22-2007 06:45 AM
Tony Rogerson Go to last post
4 324
Just wondered if anyone had seen this: http://www.regdeveloper.co.uk/2007/12/17/amazon_simpledb/ While in principle a globally accessible database...
12-21-2007 07:56 PM
Lon Stowell Go to last post
9 315
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...
12-19-2007 10:41 PM
rpl Go to last post
2 307
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 06:42 PM
Brian Selzer Go to last post
10 523
OK, this is about my fifth day doing databases, and I've read about 1NF, 2NF, 3NF here:...
12-15-2007 09:48 AM
raylopez99 Go to last post
10 470
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...
12-14-2007 05:51 PM
-CELKO- Go to last post
6 314
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 03:40 PM
Bob Badour Go to last post
2 321
In paper "Independence of Logic Database Queries and Updates" by C. Elkan it is proven that for logical databases query independency from updates...
12-14-2007 09:23 AM
silentser@gmail.com Go to last post
4 380
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 07:17 PM
V.J. Kumar Go to last post
28 511
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 06:18 PM
Brian Selzer Go to last post
5 344
Valentina Office Server, Valentina Embedded Server and the free Valentina Community Server for Linux now support custom database properties, some of...
12-07-2007 04:57 PM
Bob Badour Go to last post
1 253
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...
12-06-2007 05:20 PM
Jonathan Leffler Go to last post
2 278
paul c wrote: I like the "relvar" entry in Wikipedia. Short, but sweet. -- Reinier
David Cressey
12-06-2007 01:26 PM
rpost Go to last post
26 695
paul c wrote: There was a typo in the postal code: H0H 0H0
12-04-2007 07:31 AM
floronDBA Go to last post
4 284
"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 04:51 AM
Jan Hidders Go to last post
88 1,400
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 08:29 AM
David Cressey Go to last post
13 656
"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...
11-30-2007 10:25 AM
JOG Go to last post
50 1,197
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...
11-28-2007 06:00 PM
Cimode Go to last post
17 489
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 01:54 PM
Bob Badour Go to last post
6 308
Give me advise please, from what I can start learning database theory?
11-17-2007 06:43 PM
JAK Go to last post
2 313
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 06:33 PM
David BL Go to last post
91 1,676
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...
11-11-2007 10:44 AM
Bob Badour Go to last post
33 775
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 02:13 AM
Jon Heggland Go to last post
59 1,415
This e-book contains over 1,100 pages of information that establish a new paradigm for the integrated Enterprise Data Architecture. It is...
11-04-2007 04:21 AM
Roy Hann Go to last post
14 436
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...
10-31-2007 08:29 AM
Arash Go to last post
2 287
paul c wrote: "Keeping up Appearances" - quite apt for this thread! Especially given the surname is pronounced "bookay" (aka bouquet). Classic...
10-31-2007 04:27 AM
Authorised User Go to last post
20 332
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...
10-25-2007 10:06 AM
Patricia Shanahan Go to last post
6 136
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 10:33 PM
David BL Go to last post
2 138
DB layout is as follows: -------------------------------- 1 ------------------------------- 1
10-24-2007 12:52 PM
Cimode Go to last post
32 444
"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 09:21 AM
Dr. Dweeb Go to last post
26 362
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....
10-18-2007 11:06 PM
Ed Prochak Go to last post
1 240
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...
10-14-2007 11:31 AM
Cimode Go to last post
6 122
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 02:33 PM
Bob Badour Go to last post
1 130
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...
10-08-2007 01:36 AM
Jon Heggland Go to last post
4 139
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...
10-06-2007 01:55 PM
David Portas Go to last post
5 144
Post New Thread

Display Options
Showing threads 301 to 350 of 1742
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 - 2015, Jelsoft Enterprises Ltd.