Hello,
Consider the following PostgreSQL or Oracle SQL DDL code:
CREATE TABLE fooTable (
foo INTEGER,
PRIMARY KEY (foo)
);
CREATE TABLE barTable (
bar INTEGER,
foo INTEGER,
PRIMARY KEY (bar),
FOREIGN KEY (foo) REFERENCES fooTable
);
When the same code is run against MySQL 4.1 the following error is output:
ERROR 1005 (HY000): Can't create table '.\foobar\barta ble.frm' (errno: 150)
The reason is that MySQL 4.1 seems to require the names of referenced fields
in the referenced table to be specified even when their names are the same as
ones in the referencing table. Here is how the problem is fixed on MySQL 4.1:
CREATE TABLE barTable (
bar INTEGER,
foo INTEGER,
PRIMARY KEY (bar),
FOREIGN KEY (foo) REFERENCES fooTable (foo)
);
I wonder whether there are plans for future versions of MySQL to relax this
restriction in an attempt to better comply with other RDBMSs' syntax.
Thanks,
Neil 1 1596
Neil Zanella wrote: The reason is that MySQL 4.1 seems to require the names of referenced fields in the referenced table to be specified even when their names are the same as ones in the referencing table. Here is how the problem is fixed on MySQL 4.1:
CREATE TABLE barTable ( bar INTEGER, foo INTEGER, PRIMARY KEY (bar), FOREIGN KEY (foo) REFERENCES fooTable (foo) );
For what it's worth, the following works for me (in MySQL 5.0.2):
CREATE TABLE barTable (
bar INTEGER,
foo INTEGER REFERENCES fooTable,
PRIMARY KEY (bar)
);
But the constraint syntax you were trying still fails in 5.0.2, as you
found it does in MySQL 4.1.
I wonder whether there are plans for future versions of MySQL to relax this restriction in an attempt to better comply with other RDBMSs' syntax.
I don't think anyone on this newsgroup can answer that.
Regards,
Bill K. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
by: 'bonehead |
last post by:
Greetings,
I'd like to figure out some syntax for retrieving the data from a table
when I don't know all the of field names. What I do know are, the name
of the table, the names of the primary key fields, and the names of the
fields I want to use in the "where" clause of the SELECT statement. All
of the examples I've seen in my books only show how to do this by
hard-coding the names of each of the fields, i.e.,
$userid=$query_data;
|
by: dave |
last post by:
Hello there,
I am at my wit's end ! I have used the following script succesfully to
upload an image to my web space. But what I really want to be able to do is
to update an existing record in a table in MySQL with the path & filename to
the image.
I have successfully uploaded and performed an update query on the database,
but the problem I have is I cannot retain the primary key field in a
variable which is then used in a SQL update...
|
by: Lenz Grimmer |
last post by:
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
Hi,
MySQL 4.0.14, a new version of the popular Open Source/Free Software
Database, has been released. It is now available in source and binary form
for a number of platforms from our download pages at
http://www.mysql.com/downloads/ and mirror sites.
|
by: Chris |
last post by:
Hi, I am currently designing a simple service orders database. I have played
around with MySQL a bit but this is the first time I'm using it in anger, I
have a few design queries to make sure I am implementing the database
correctly.
Currently I have a number of tables, the first being the package table
(lists the different service names - such as small, medium etc). Note in the
tables I have trimmed a lot of the unnecessary stuff to...
|
by: Good Man |
last post by:
Hi there
I've noticed some very weird things happening with my current MySQL setup
on my XP Laptop, a development machine.
For a while, I have been trying to get the MySQL cache to work. Despite
entering the required lines to "my.ini" (the new my.cnf) through notepad
AND MySQL Administrator, the cache does not work.
So, today I took a peek at the 'Health' tab in MySQL Administrator.
| |
by: NewbieSupreme |
last post by:
I'm using PHPMyAdmin on an Apache2Triad install (latest version; 5.x.x,
which installs PHP5 and PHPMyAdmin 2.8 as well). In Access, I exported a
table to a text file, tab-delimited, text qualifyer of "none" (this is how I
read to do it from newsgroups).
When I use the Query window in phpmyadmin to import the text file, it waits
a while, then returns an error:
#1064 - You have an error in your SQL syntax; check the manual that...
|
by: S.Dickson |
last post by:
I had an access database that i use as an ordering system. I have a
form for entering customer details. When i add a new customer on the
form the customer number is an auto number that appears when i type in
the details.
I have just moved over to mysql server with access as the front end. I
have setup the sql tables with the customer number as autonumber.
When i go into the form and add a new customer it does not generate the
|
by: Atli |
last post by:
This is an easy to digest 12 step guide on basics of using MySQL. It's a great refresher for those who need it and it work's great for first time MySQL users.
Anyone should be able to get through this without much trouble. Programming knowledge is not required.
Index
What is SQL?
Why MySQL?
Installing MySQL.
Using the MySQL command line interface
|
by: ssnaik84 |
last post by:
Hi Guys,
Last year I got a chance to work with R&D team, which was working on DB scripts conversion..
Though there is migration tool available, it converts only tables and constraints..
Rest of things (stored procedures, functions).. we have to manually edit.
That time, we face some interesting challenges.. I failed to document all of them, but whatever I can share with u.. I will try.. :)
...
|
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,...
|
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: 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,...
|
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: 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...
|
by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
| |
by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
| |