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• SQL query joining rows with same value

  - by user1285737

  I need to write a query that creates a view that calculates the total cost of each sale, by considering quantity and price of each bought item. The view should return the debit and total cost. In the answer each debit-number should only occur once. Thanks in advance Table ITEM: ID NAME PRICE 118 Jeans 100 120 Towel 20 127 Shirt 55 Table DEBIT: DEBIT ITEM Quantity 100581 118 5 100581 120 1 100586 127 5

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• how to do this problem?

  - by Sachin Tendulkar

  Write an iterative program that finds the largest number of McNuggets that cannot be bought in exact quantity. Your program should print the answer in the following format (where the correct number is provided in place of n): "Largest number of McNuggets that cannot be bought in exact quantity: n"

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• Create ActiveRecord migration then edit in one step?

  - by geosteve

  I find myself doing this a lot: script/generate migration my_new_migration .. then select & copy the generated filename, then paste it into vi to actually write the migration. Is there any way to do this in one step? i.e. when the script/generate migration runs, it creates the file the automatically opens that file in an editor? (I'm working in an SSH terminal window on linux..)

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• Under what circumstances does it make sense to run a WCF client and server on the same machine?

  - by Rising Star

  In Learning WCF, by Michele Bustamante, there is a section that describes a binding called the NetNamedPipes binding. The books says that this binding can only be used for WCF services that will be called exclusively from the same machine. Under what circumstances would it make sense to use this? Ordinarily, I would write asynchronous code without using WCF... Why would Microsoft provide something for WCF that can only run on the same machine?

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• writing a shell script if statement to check for directory

  - by user1553248

  I need to write a script that will recreate my opt folder if it gets deleted when I remove a package from it. Here's a link to my previous post: dpkg remove to stop processes Now, the issue I'm running into could be better described here: http://lists.debian.org/debian-devel/2006/03/msg00242.html I was thinking of just adding a postrem script which checks if an opt directory exists, and if not, creates one. My experience with shell scripts is pretty limited though..

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• Platform Independent, Lightweight Programming Language

  - by Jack Mills

  I need to write an extremely lightweight program (trying to get below 8Kb) that performs some simple math. The language also needs to be platform independent. Which language do you think would work the best? (Oh, and no frameworks allowed.)

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• Help to learn Image Search algorithm

  - by R Manu

  I am a beginner in image processing. I want to write an application in C++ or in C# for Searching an image in a list of images Searching for a particular feature (for e.g. face) in a list of images. Can anybody suggest where should I start from? What all should I learn before doing this? Where can I find the correct information regarding this?

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• Protocol communication help..

  - by Gopal

  Using Visual Studio 2005 Language: c# A new to c# I have software, the software should communicate with gprs devices. So i want to write a protocol, TCP, UDP communication code. Can any one give some idea for writing a source code and some sample code also.

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• Make sure bad patterns don't come back after refactoring

  - by Let_Me_Be

  I'm refactoring an old C code. The code has absolutely no layered architecture (everything is being accessed by everything) and I'm trying to change that. I would like to cut direct access to structure members (at least write for now) and only allow access through access functions. Is there some tool (or perhaps directly the compiler) that could check this rule for me? I need this since I'm maintaining a fork and the upstream isn't very concerned with code quality.

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• exctract test in perl

  - by Daziplqa

  I have a file containing the following content 1000 line in the following format: abc def ghi gkl how to write perl script to convert it into : abc ghi ??

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• Good book for sql

  - by Uday

  I always considered database as a storage . but never thought it can be used for querying across tables etc. Which is a good book for sql for a developer. not just the syntax. How to write a query in different ways How internally queries are executed.etc especially related to microsoft sql server

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• Create custom event handler occurs when recieve message from keyboard

  - by Rinaldi

  Hi.. i need to know how to create own event handler occurs when we recieve message from keyboard or the button was pressed and then we write output in a textbox...

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• How to find out about the User Agent in GWT

  - by Kasturi

  I am trying to write browser specific code. Is there a GWT API to find out which browser the client is using?

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• What do people find difficult about C pointers?

  - by Paul

  From the number of questions posted here, it's clear that people have some pretty fundemental issues when getting their heads around pointers and pointer arithmetic. I'm curious to know why. They've never really caused me major problems (although I first learned about them back in the Neolithic). In order to write better answers to these questions, I'd like to know what people find difficult. So, if you're struggling with pointers, or you recently were but suddenly "got it", what were the aspects of pointers that caused you problems?

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• cloning a database with backing up possible?

  - by Jreeter

  I need to write a tool to clone a database, instead of detaching it and copying the .mdf and .ldf, wouldn't it be better to just back it up and restore a newly created db? Is there a way using SQL to create a database from a .bak?

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• algorithm to make easy my job

  - by gcc

  Iwill tell part of study material task but, dont afraid, I dont want write all of them , I will ask just specific question.okey; User will give me a function with three unknown. example: sin(a+b)+ln(5)*(log(ab)-32/sqrt(abc)) another example for function atan(23/a)-exp(a,b)*(123+asin(ac)) and there are some another input with funtion but in all input a,b and c, are doesnot determined, Anyway,I wont tell the other part,I just asking how I should take the fuction such that I can do my job with easy?

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• How to convert AS3 ByteArray into wchar_t const* filename? (Adobe Alchemy)

  - by Ole Jak

  How to convert AS3 ByteArray into wchar_t const* filename? So in my C code I have a function waiting for a file with void fun (wchar_t const* filename) how to send to that function my ByteArray? (Or, how should I re-write my function?)

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• How do I modify the hundards of records based on my query result?

  - by Nano HE

  Hi, I inserted some error record to my table, I can query via the sql below and found hundards of record marked with half. SELECT * FROM `marathon` WHERE gender = 'male' && distance = 'half'; How to write a SQL then I can modify the result rows distance from 'half' to 'full'. Thank you.

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• Running the same code for get(self) as post(self)

  - by Peter Farmer

  Its been mentioned in other answers about getting the same code running for both the def get(self) and the def post(self) for any given request. I was wondering what techniques people use, I was thinking of: class ListSubs(webapp.RequestHandler): def get(self): self._run() def post(self): self._run() def _run(self): self.response.out.write("This works nicely!")

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• Linux network programming. What can I start with?

  - by Negai

  Hi everyone! I've recently got interested in Linux network programming and read quite a bit (Beej's Guide to Network Programming). But now I'm confused. I would like to write something to have some practice, but I don't know what exactly. Could please recommend me a couple of projects to start with? Thanks.

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• Mercurial API and Extensions resources

  - by Sly

  I want to write extensions for Mercurial. What are good resources such as tutorials, guides, API reference or maybe even a existing extension that is well commented and easy to lean from the source. So far, I have only found the short MercurialApi and WritingExtensions wiki pages.

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• How do I serve a large file using Pylons?

  - by Chris R

  I am writing a Pylons-based download gateway. The gateway's client will address files by ID: /file_gw/download/1 Internally, the file itself is accessed via HTTP from an internal file server: http://internal-srv/path/to/file_1.content The files may be quite large, so I want to stream the content. I store metadata about the file in a StoredFile model object: class StoredFile(Base): id = Column(Integer, primary_key=True) name = Column(String) size = Column(Integer) content_type = Column(String) url = Column(String) Given this, what's the best (ie: most architecturally-sound, performant, et al) way to write my file_gw controller?

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• Can you use constant variables in javascript?

  - by chobo2

  Hi I am using visual studios 2010 and created a javascript file(jscript.js) and I saw on one page saying you can make constant variables in javascript like: const x = 20; bu to on another page I read it says you can't. So I am confused now what is it now? Also in Visual studios when I write "const" it underlines it in the javascript file and goes syntax error.

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• Date comparison in Oracle database

  - by Jasim

  I have two variable TO_DATE and FROM_DATE. My table has two fields DOJ and DOL. I want to select all the records whose DOJ < TO_DATE and DOL FROM_DATE. How can i write an SQL query in for this??

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• I'm following Qt Tutorials and got a simple question

  - by nzer0

  If I want to create my own class MyWidget which inherits from QWidget Tutorial tells me to write constructor like this... MyWidget::MyWidget(QWidget *parent) : QWidget(parent){....} I'm wondering what is the role of : QWidget(parent) Does it mean explicit call for QWidget's constructor?

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