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by: Randell D. |
last post by:
Can anyone tell me what the difference is between keys and indexes?
Much appreciated,
randelld
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by: Ed Smith |
last post by:
I have two questions about REFERENCES:
1. It appears that mySQL treats REFERENCES associated with an
attribute differently than FOREIGN KEY (<blah>) REFERENCES...
Specifically, the first form does not appear to work, while the later
does. Here's a simple example (slightly edited):
mysql> CREATE TABLE person (id char(5) primary key);
Query OK, 0 rows affected (0.04 sec)
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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: jakk |
last post by:
hello all,
whats the Difference between bin and obj directories and difference
between project references and dll references?
thanks
jack
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by: Scott Goodwin |
last post by:
In the following example:
create table parent (
id integer unique not null,
name varchar(24)
);
create table child (
first_name varchar(256),
last_name varchar(256)
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by: Scott Goodwin |
last post by:
The following SQL:
create table toinherit (
id integer primary key
);
create table leftside (
leftname varchar(64) not null unique
) inherits (toinherit);
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by: Chirag |
last post by:
I want to create a table with
member id(primary key for Students,faculty and staff )
and now i want to create issues with foreign key as member id
but in references i could not able to pass on reference as or
condition for students, faculty and staff.
Thank You,
Chirag
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by: Steve |
last post by:
I am trying to calculate elapsed travel times for flights. My plan is
to enter the local departure time, the departure city and the local
arrival time and city. These times would be standardised to GMT and a
date difference calculated which would be the theoretical elapsed time
of the flight
I have one Table called Cities which has the name of the city and the
difference from GMT eg Sydney is 10 (ie 10 hrs ahead of GMT), LA is -7
ie 7...
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by: balabaster |
last post by:
Hi,
I have a couple of tables:
Units(
Unit_PKey Int Identity(1,1) Primary Key,
Unit_Name nvarchar(8),
Unit_Description nvarchar(32)
)
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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: 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: 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: 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
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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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