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by: Ron |
last post by:
Mandatories: Ver 7.3.4, Redhat Linux 8.0, P4, 2GB RAM
I want to add a 'nullable' foreign key to a column in a table. I have
tables "company" and "project" which may be related by
company.companyID <-> project.companyID.
project.companyID is allowed to be null. However, when someone tries to
delete a company which is still referenced in "project" I want a
constraint restricting deletion.
I tried:
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by: reneeccwest |
last post by:
There are two tables, parent and child table.
Foreign key field of the child table is not a required field. If the
data is submitted w/o a value into the foreign key field, what should
I make it as a default value? Should it be "null"?
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by: Robert Brown |
last post by:
Let's say I have a type hierarchy: (just an example)
the general entity customer:
CREATE TABLE customer(customer_id int, customer_name varchar(250),
customer_type int)
three specific customer subtypes: 1 - business, 2 - home, 3 -
university
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by: Scott Ribe |
last post by:
I've got a problem which I think may be a bug in Postgres, but I wonder if
I'm missing something. Two tables, A & B have foreign key relations to each
other. A 3rd table C, inherits from A. A stored procedure updates a row in
C, adds a row each in B & C. I get an integrity violation. All the foreign
keys are deferrable, and the stored procedure is called from within a
transaction with constraints deferred. (And the foreign keys do refer to...
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by: D. Dante Lorenso |
last post by:
I'd like to run a clean up command on my tables to
eliminate rows that I'm no longer using in the database.
I want to do something like this:
DELETE FROM tablename
WHERE IS_REFERENCED_BY_FOREIGN_KEY IS FALSE;
Does anyone know how something like this could be done
in PostgreSQL? I know I can search all the tables that
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by: Ev |
last post by:
I have a database table in SQL Server that has a self join. In C# I have a
DataTable with a self-join. I have defined a foreign key constraint on the
DataTable for the self join. The AcceptRejectRule is set to Cascade
Table Structure:
OrderID (Identity field)
OrderDesc
OrderParent (this is the self-join - it is a foreign key to OrderID)
In my code I add several rows to the table, createing a hierarchy of orders
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by: Tim::.. |
last post by:
Can someone please tell me why I keep getting the following error from the
code below!
Error: INSERT statement conflicted with COLUMN FOREIGN KEY constraint
'FK_tblOfficePageContent_tblPageContent'. The conflict occurred in database
'CPNCMS', table 'tblPageContent', column 'pageID'. The statement has been
terminated.
I cant seem to see why I keep getting an error when I do the insert!
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by: shreedhan |
last post by:
I have two tables table1 and table2
Table1 has a foreign key which references key of table2
Table2 also has a foreign key which references key of table1
Now when I try to insert into any of those 2 tables, violation of foreign key occurs.
How can I insert into both tables without violating foreign key
Is there any way to insert both tables simultaneously?
thanks
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by: Geoff Cox |
last post by:
Hello,
I have been using Javascript to access some audio files from another
server and there has been no associated problem with IE or FF but
Opera gave an error message which led me to read that accessing files
from a "foreign" domain name is a security violation for Javascript.
This true? If yes, why do all above browsers allow it to happen?!
The reason for putting the audio files on another server was to cope
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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: 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...
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by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
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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...
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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...
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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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by: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...
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