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by: shaun palmer |
last post by:
when or Where do you use a union query ?
how can I wright sql,
tblPopulation,* tblcustomer,* one to one with
all the appropriate attributes(field).
Your help would be greatly
appreciated. Thank you.
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by: Frederik |
last post by:
Hi all,
I'm building a C# application that uses a M$ Acces database. In one of
the queries I use something like the following:
SELECT id FROM mytable WHERE id IN (20, 12, 21, 14)
The result is fine, except that the order of the id's is not
preserved. It seems to be ordered ascending. How can I keep the order
I used as input?
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by: Razmig K |
last post by:
Dear mates,
This is an another survey for the common (and uncommon) nontrivial
uses of the aforementioned C construct.
It's posted by the same average C programmer who's made a similar
survey about the uses of 'enum's.
I know that space optimization is the key idea behind 'union's, and in
most cases a type-field is necessary to verify the type of the entity
in the 'union' variable.
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by: rohit |
last post by:
Hi,
In my couple of years of experience, I have never found a single
instance where I needed to use unions and bitfields(though I have used
structures).I was just imagining where would these find
relevance.Though both of these(bitfields and unions) are used where
space is a constraint(so I can assume always in embedded systems,where
memory is particularly less)and we want to save space/memory.
As far as I have read, there is no...
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by: Sean Dolan |
last post by:
typedef struct ntt {
int type;
union {
int i;
char* s;
};
}nt;
nt n;
n.i = 0;
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by: ranjeet.gupta |
last post by:
Dear ALL
As we know that when we declare the union then we have the size of the
union which is the size of the highest data type as in the below case
the
size should be 4 (For my case and compiler), and it is,
what I conclude from the below code
union data_type {
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by: Pavel Stehule |
last post by:
Hello,
Pg make query 1. and 2. very fast (use index), but for query 3. dont use
index. I can solve its using select union, but I readed so pg 7.5 don't
problem with OR operator. I use cvs pg. I used vacuum analyze first.
table sp_op_product has 15K rows, sp_op_uct 37K rows;
regards
Pavel Stehule
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by: piboye |
last post by:
Hi !
I'm a academician in china. I have been intereted in C++ lasting.
In reading the C++ Primer book, i have a trouble about union.
In the book ,it said that union can have constructors and destructor
,or other member functions.
I can understand using constructors and memeber functions,but what
is destructor used for?
I have appealled to the forums in chinese ,but no enough usefull
feedback.
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by: PengYu.UT |
last post by:
Hi,
I'm reading an R-tree implementation converted from C to C++. A union
is used for the internal nodes and the leaves of the tree.
union
{
Node* m_child; ///Child node, if it
is an internal node
DATATYPE m_data; ///Data, if it is a leaf.
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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: 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...
|
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: 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...
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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: 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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