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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: Bob Bedford |
last post by:
I'm building my first MySQL database and come into trooble when trying to
create constraint integrity.
I'm trying to get it work by hand (notepad) but thing that it would be
better to create the tables using a graphical tool, but I can't find any for
MySQL.
Please help by giving me URL's for graphical tools (if possible free) that
manage constraint integrity.
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by: ·sÂA¤H |
last post by:
I am doing a XML-based workflow management system in Final year project.
I wanted to develop a GUI (drag and drop graphic) to define the rule of
workflow and save it to XML.
How can I generate graphic to XML format?
Is anyone call tell me what can I do for this?
I am a freshmen of XML
thanks for your help and advise
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by: Darren |
last post by:
X-No-Archive
Hi all,
Can anyone help me with structuring the data in a small tool I have to
build? I'm trying to work out if there's a design pattern or data
structure that would remove some of the dependencies.
I am designing an animation tool.
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by: Airline Pedestal |
last post by:
Does anyone know of a tool that
will create a graphical diagram from
a DDL (SQL create script)? Preferable
a free open-source tool.
Thanks,
A
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by: William Gill |
last post by:
Being somewhat new to Python, and having a tendency to over complicate
things in my class design, I was wondering if anyone can suggest a
simple graphical or flowcharting tool that they use to organize their
class and program design? Because of a 55 mph head-on accident a few
years back, I have short term memory problems, so flipping back and
forth between pages of code is next to impossible for me to keep
straight. A simple graphical...
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by: aj |
last post by:
DB2 WSE 8.1 FP5
Red Hat AS 2.1
What is the difference between adding a unique constraint like:
ALTER TABLE <SCHEMA>.<TABLE> ADD CONSTRAINT CC1131378283225 UNIQUE (
<COL1>) ;
and adding a unique index like:
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by: Brian Blais |
last post by:
Hello,
I was wondering what the approximate minimum age to learn python is. Has anyone had
experience teaching middle school students, or elementary school students Python?
What brought this up for me is thinking about starting a Lego robots group in a local
middle school. I only teach college, and have little experience with middle school
students, so I find it hard to guess what they could actually do. I started
programming when I...
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by: andrewst |
last post by:
Originally posted by Victor M .
No, Ana must have misread your insert! The SSN value '123456789' is
fine.
Originally posted by Victor M .
ALTER TABLE EMPLOYEES MODIFY CONSTRAINT DNO DISABLE;
... insert the data
ALTER TABLE EMPLOYEES MODIFY CONSTRAINT DNO ENABLE;
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by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
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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: 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...
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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: 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...
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by: TSSRALBI |
last post by:
Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
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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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