|
by: Alex Satrapa |
last post by:
I have a table from which I'm trying to extract certain information. For
historical reasons, we archive every action on a particular thing
('thing' is identified, funnily enough, by 'id'). So the only way to
find out the current state of a particular combination of attributes is
to "select distinct on (id, ...) ... order by date desc".
In the examples below, I've taken real output from psql and done a
global search/replace on various...
|
by: Michael Howes |
last post by:
I have a single DataTable in a DataSet. It has 4 columns and i'd like to
get a handful of counts of unique items in 3 of the 4 columns.
Can a DataTables Select or Compute methods to COUNT DISTINCT?
These two attempts failed
DataRow dr = ds.Tables.Select( "COUNT(DISTINCT(site_name))" );
object x = ds.Tables.Compute( "COUNT(DISTINCT(site_name))",
"ProductionCount > 0" );
|
by: Li Pang |
last post by:
Hi,
I want to know how to create a dataview from a datatable of DISTINCT data.
Thank in advance
|
by: Mike9900 |
last post by:
Hello,
I have this data in a DataSet:
Year Account Amount
1995 1 999
1995 2 323
1995 3 321
1996 1 354
|
by: =?Utf-8?B?V2lsc29uIEMuSy4gTmc=?= |
last post by:
Hi Experts,
I am doing a prototype of providing data access (read, write & search)
through Web Service. We observed that the data storing in SQL Server 2005,
the memory size is always within 250MB. Our aim is to support ~50K
concurrency users.
After investigation, we are thinking to use In-memory database for achieving
|
|
by: Frederik |
last post by:
Hi all,
Am I correct when stating that LINQ replaces somewhat DataTables?
I have done some reading concerning LINQ, but I'm still puzzled as to
whether I should use LINQ or not. My application imports data from an
XML file and stores the data in a DataSet (with 3 DataTables in it).
The DataTables are used to fill several DataGridViews (via DataViews/
BindingSources). When the user saves his changes, the DataTables are
used to rebuild...
|
by: rds80 |
last post by:
In the xml document below, I would like to retrieve the distinct
attributes for the element '<Bal>'. However, I haven't had any
success. Here is what I have so far:
<TRANS>
<TRAN TRAN_DESC_CD="ACRT" TRAN_DESC="Actual Rate">
|
by: Andy B |
last post by:
How would you find out if a linq table has 0 rows in it? I have this code:
NewsContext.V_News() '*** linq table to be tested for 0 rows
Any ideas?
|
by: Sergey Topychkanov |
last post by:
I have SQL SERVER 2008 Express and C# Express 2008 - both sp1.
I can remove and update data in my database only thru direct SQL query thru
database explorer,
but quite unable to do it through dataset and linq.
Thanks in advance
Sergey
|
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...
|
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: 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...
|
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: 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();...
|
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
|
|
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...
|