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by: Andreas |
last post by:
Hello list,
what about uniqueness of inherited primary keys ?
eg you have :
create table objects (
id int4,
date_created timestamp(0),
primary key (id)
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by: Fred |
last post by:
Hi.
What is the usual and what are the possible fields to use for the primary
key of an intersecting table of a many-to-many relationship?
I would think the typical, most common fields would be to set the
intersecting table to have its own unique primary key. Right?
OR
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by: Geoff Cayzer |
last post by:
At http://www.blueclaw-db.com/tips_tricks.htm I came across a section
which is included below and was hoping for some comment on the
article.
--------------
Almost never use this auto-number field as the primary key of the
table.
If you are thinking of hiring an Access programmer or consultant ask
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by: Philip |
last post by:
Hey all,
(Access 2000)
I've been having a horror story with this design problem. My Database is
Structured like This: AUTHORS, BOOKS, PAGES. Those are the Tables and each
Item in each table needs a unique ID# based on its context.
Primary Keys
AUTHORS = AuthorID - NO Duplicates
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by: Thomas A. Anderson |
last post by:
I am a bit confused in creating a composite primary key. I have three table
with two of the tables containing primary keys. I have two of the tables
(each with a primary key) having one to many relations with the table
containing no primary key. Do I just create two primary keys on the table
that does not contain any primary key for this to become a composite primary
key?
Thank you in advance!
Still a newbie,
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by: GGerard |
last post by:
Hello
I'm trying to find the best way to set indexes and primary keys on MSAccess
tables
What are the advantages and disadvantages of indexes and primary keys?
What fields should be indexed?
Should I index more than one field per table?
What fields should have the primary key?
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by: LurfysMa |
last post by:
Most of the reference books recommend autonum primary keys, but the
Access help says that any unique keys will work.
What are the tradeoffs?
I have several tables that have unique fields. Can I use them as
primary keys or should I define an autonum primary key?
One table has information about the 50 states in the US. The table
looks like this:
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by: ravichoudhari |
last post by:
i came accross requirement of multiple foreign keys in a table
referencing the same primary key another table. i created the table
relations using the relations editor in access. even though i could
have multiple foreign keys to a table access did allow the referential
integrity.
my database structure is
table1 - students table
table 2 - subjects table
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by: Danny |
last post by:
Hello,
We imported a bunch of tables from a database and realized that the
primary keys weren't copied to the destination db. In order to re-
create the keys, we need to know which tables have them. Is there a
command that I can use (on the source db) to find out which tables
contain primary keys? The db has hundreds of tables and I'd rather not
go through each one to see which has a primary key.
Also, for future reference, is there a...
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by: Peter |
last post by:
I am interested in informed feedback on the use of Constraints, Primary Keys
and Unique.
The following SQL statement creates a Bands tables for a database of
bookings Bands into Venues, where the rule of the business is that only band
plays on the one night.
The SQL statement prevents a Band name being repeated (as it is Unique).
Similar statement for the Venues.
CREATE TABLE Bands
(BandID varchar(5) CONSTRAINT BandID PRIMARY KEY,
Band...
|
by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it.
First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
|
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by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
|
by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
|
by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
|
by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
|
by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
|
by: conductexam |
last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one.
At the time of converting from word file to html my equations which are in the word document file was convert into image.
Globals.ThisAddIn.Application.ActiveDocument.Select();...
|
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by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
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by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
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