by: Luc Martineau |
last post by:
Hello
When we create a table, what is the difference between
the REFERENCE constraint on column and the FOREIGN KEY constraint on table ?
I guess that the FOREIGN KEY constraint assures us...
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by: Jeremiah Jacks |
last post by:
I just upgraded to MySQL 4.0.14-standard for RedHat Linux and am using =
the
pre-compiled binaries.
I have a database with INNODB tables.
When I insert a row into one of the child tables, I get...
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by: Gunnar Vøyenli |
last post by:
Hi!
For the sake of simplicity, I have three tables, Employee, Department and
Work
Employee >---- Department
\ /
\ /
^ ^
Work
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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...
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by: adammitchell |
last post by:
How can you indicate that a FOREIGN KEY constraint references two
columns in two different tables?
"SQL Server Books Online" show an example of how to reference two
columns in the SAME table:...
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by: Bob Stearns |
last post by:
Why is the following constraint invalid? I want to make sure that every
row in IS3.ANIMALS_PRIV_INDEXES matches one of those in
IS3.table_var_defn with part of the primary key fixed. Since this is...
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by: Alfredo |
last post by:
Hello, I have created the following table and her relations
CREATE TABLE bannerdetail (objectname VARCHAR(30), elementname
VARCHAR(30), sequence SMALLINT) ;
CREATE UNIQUE INDEX primarykey ON...
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by: Tibor |
last post by:
I am using PostgreSQL 7.4.1 (only through psql)
I know, that the command
ALTER TABLE OFFICES
DROP PRIMARY KEY (CITY);
and its foreign key equivalent:
ALTER TABLE SALESREPS
DROP CONSTRAINT
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by: freeskier |
last post by:
Hello,
Sorry for the newb question; I've spent a good amount of time trying to figure this out. I am fairly new to the Postgre world. I am currently in the process of upsizing several MS Access...
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by: ryjfgjl |
last post by:
If we have dozens or hundreds of excel to import into the database, if we use the excel import function provided by database editors such as navicat, it will be extremely tedious and time-consuming...
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by: ryjfgjl |
last post by:
In our work, we often receive Excel tables with data in the same format. If we want to analyze these data, it can be difficult to analyze them because the data is spread across multiple Excel files...
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by: emmanuelkatto |
last post by:
Hi All, I am Emmanuel katto from Uganda. I want to ask what challenges you've faced while migrating a website to cloud.
Please let me know.
Thanks!
Emmanuel
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by: Hystou |
last post by:
There are some requirements for setting up RAID:
1. The motherboard and BIOS support RAID configuration.
2. The motherboard has 2 or more available SATA protocol SSD/HDD slots (including MSATA, M.2...
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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,...
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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,...
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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...
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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...
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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...
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