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• SQL: Join vs. subquery

  - by Col. Shrapnel

  I am an old-school MySQL user and always preferred JOIN over sub-query. But nowadays everyone uses sub-query and I hate it, dunno why. Though I've lack of theoretical knowledge to judge myself if there are any difference. Well, I am curious if sub-query as good as join and there is no thing to worry about?

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• recommendation systems and the cold start problem

  - by Hellnar

  Hello, I am curious what are the methods / approaches to overcome the "cold start" problem where when a new user or an item enters the system, due to lack of info about this new entity, making recommendation is a problem. I can think of doing some prediction based recommendation (like gender, nationality and so on). Thanks

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• Favorite Django Tips & Features?

  - by Haes

  Inspired by the question series 'Hidden features of ...', I am curious to hear about your favorite Django tips or lesser known but useful features you know of. Please, include only one tip per answer. Add Django version requirements if there are any.

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• Visual Studio support for coding in MSIL?

  - by jdk

  For the longest time I've been curious to code in Microsoft Intermediate Language (MSIL) just as an academic endeavour and to gain a better understanding of what's "happening under the hood". Is there any sort of Visual Studio support for this in the form of: project templates, IntelliSense integration, and those kind of RAD features?

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• Possiblity of loading/executing ELF files on OSX

  - by Daniel Brotherston

  I'm just curious as to the possibility of loading and executing elf files on OSX. I know the standard executable format is MACHO, but NASM is unable to generate debug information for MACHO objects (and I am required to use NASM). I imagine its a long shot, but I don't suppose I can use ELF files. I can build them with NASM, but I can't seem to even link them with LD.

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• Big O, how do you calculate/approximate it?

  - by Sven

  Most people with a degree in CS will certainly know what Big O stands for. It helps us to measure how (in)efficient an algorithm really is and if you know in what category the problem you are trying to solve lays in you can figure out if it is still possible to squeeze out that little extra performance.* But I'm curious, how do you calculate or approximate the complexity of your algorithms? *: but as they say, don't overdo it, premature optimization is the root of all evil, and optimization without a justified cause should deserve that name as well.

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• Why doesn't XmlSerializer support Dictionary?

  - by theburningmonk

  Just curious as to why Dictionary is not supported by XmlSerializer? You can get around it easily enough by using DataContractSerializer and writing the object to a XmlTextWriter, but what are the characteristics of a Dictionary that makes it difficult for a XmlSerializer to deal with considering it's really an array of KeyValuePairs. In fact, you can pass an IDictionary<TKey, TItem> to a method expecting an IEnumerable<KeyValuePairs<TKey, ITem>>.

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• c# string formatting

  - by user177883

  I m curious why would i use string formatting while i can use concatenation such as Console.WriteLine("Hello {0} !", name); Console.WriteLine("Hello "+ name + " !"); Why to prefer the first one over second?

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• How Does Ctrl-K work in Stackoverflow

  - by harigm

  I am very curious to know how to implement the Ctrl-K feature against code, For sample public static void main(Stirng args[]){ System.out.println.out("welcome"); } That will be nicely formatted? 1)Do we require any package to implement this? 2) Any ready made code avaialble to do this? Can any one help me with this, I am planning to develop a site where this feature would be a real helpful.

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• What is the current state of Perl 6?

  - by Cobalt

  What is the current state of Perl 6, is it production-ready? Where do we stand right now? There are many programmers curious about the current progress of Perl 6. There are also two other topics open on on reddit and http://perlmonks.org/?node_id=835419 about this.

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• Google C++ style guide

  - by user231536

  I am curious as to what people think of the google C++ style guide. http://google-styleguide.googlecode.com/svn/trunk/cppguide.xml I see references to it scattered across stackoverflow and would like to collect your opinions as to what you think about it.

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• Google Web Toolkit, what can I do with it?

  - by Dr Hydralisk

  I was recently looking into Google Web Toolkit and it seemed really interesting. I was curious what can I really do with it, can I simple register and login system or similar things?

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• Best way to ensure accurate timing with C

  - by Paul

  I am a beginning C programmer (though not a beginning programmer) looking to dive into a project to teach myself C. My project is music-based, and because of this I am curious whether there are any 'best practices' per-se, when it comes to timing functions.

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• Grails: Services VS Groovy classes

  - by Olexandr

  Documentation says: The Grails team discourages the embedding of core application logic inside controllers, as it does not promote re-use and a clean separation of concerns. I have one API controller and a few Groovy classes in src/groovy folder. Those classes just implements my application logic so actions in API controller works in this way: //index page def index = { render new IndexApi().index(params) as JSON } I'm curious - is there any reason to move my application logic from plain groovy classes into services ?

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• other way to add item to List<>

  - by netmajor

  In my other question You can see code of my arr structure and PriorityQueue collection. I normally add items to this collection like that: arr.PriorityQueue.Add(new element((value(item, endPoint) + value(startPoint, item)),item)); I am curious that is other way to do this (add element(which is struct) object to List) ? In lambda way for example ? I just eager for knowledge :)

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• How can I get returning data from jquery ajax request?

  - by Oguz

  function isNewUsername(str){ var result; $.post('/api/isnewusername', {username:str}, function(data) { result = data.result; }, "json"); return result; } So , my problem is very simple but I can not figure it out . I want to access result from the isnewusername function . I am very curious about answer because I spent 1 hour on it . Thank you

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• Programmers joy: the proccess or the result?

  - by faya

  Hello, Recently I stumbled upon this curious question: What is importing for yourself when programming: process or result? I found myself that I love outcome, when everything is done! So I tried to ask some colleagues at work, but all of them responded that they like the development process the most. Myself I like process too, but not as much as outcome. So to which people category you belong too? And if there is a reason, could you express why?

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• Text -> Diagram Tool

  - by Jon

  I'm looking for an diagram tool for producing diagrams from text. I only really need sequence and state type diagrams for now, but I'm curious as to what people would recommend? I need something which is standalone, not a web based tool that works on Linux, OSX and Windows.

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• How does IP geolocating work?

  - by weicool

  I'm not looking for a service that does this. I'm just curious as to how geolocation works.

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• How to sort a list in Scala by two fields?

  - by Twistleton

  how to sort a list in Scala by two fields, in this example I will sort by lastName and firstName? case class Row(var firstName: String, var lastName: String, var city: String) var rows = List(new Row("Oscar", "Wilde", "London"), new Row("Otto", "Swift", "Berlin"), new Row("Carl", "Swift", "Paris"), new Row("Hans", "Swift", "Dublin"), new Row("Hugo", "Swift", "Sligo")) rows.sortBy(_.lastName) I try things like this rows.sortBy(_.lastName + _.firstName) but it doesn't work. So I be curious for a good and easy solution. Thanks in advance! Pongo

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• sin v/s sinf fucntion in C

  - by user319873

  Hi Guys, I am trying to use sinf function in my C Program and it does give me undefined reference under MSVC 6.0 but sin works fine. This make me curious to find the difference between sin and sinf. What is the logical difference between sin and sinf(). How can I implement my own sinf functionality?

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• Curiosity beyond abstractions: how do device drivers work?

  - by Yktula

  Everything I've seen on *nix has been a set of abstractions off hardware, but I'm curious as to how the hardware works. I've programmed in assembly, but that's still only a set of abstractions. How do device drivers work (at a lower level)? How does a processor understand assembly opcodes (as bytecode)?

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• XML serializer filename

  - by Alexander

  I want to serialize an object into an xml and I want the filename of the xml to be random as following 636211ad-ef28-47b9-aa60-207d3fbb9580.xml fc3b491e5-59ac-4f6a-81e5-27e971b903ed.xml I am just curious on how to do such thing?

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• Updating protected using update_all

  - by Jack

  Since you cannot use the normal 'update' and 'update_attribute' methods from ActiveRecord to update a protected attribute, is the following the best way to update an attribute for a single user? User.update_all("admin = true","id = 1") I'm guessing this doesn't lie in the 'best practice' category, so I'm just curious if there is a more appropriate way.

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• nhibernate virtual methods & resharper

  - by Berryl

  I am curious how other Resharper users deal wih R#'s complaint about virtual methods it thinks are unused because it can't tell that NHIb will use them at runtime. I currently leave it as a hint, reluctantly, although am tempted to shut it off completely. Cheers, Berryl

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