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  • Do database tables need to have IDs?

    - by Arturas M
    Is an ID field is always needed in database tables? In my case I have a user with firstName, lastName and email fields. email is unique and not null, so it could be used as an ID, right? So in that case, could/should I try to remove the ID? Also I want to have another table which extends this one. Let's say its called patient and it has it's own field additionalData and I would like to link the relationship through the email of user I mentioned. So the relationship should be 1 to 1, right? and I wouldn't need the IDs? Somehow MySQL Workbench wants me to use the IDs. What do you guys think. Any suggestions on this topic?

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  • java MainServer gives java.lang.UnsupportedClassVersionError: Unsupported major.minor version 51.0

    - by Paradox
    Compiling is easy but when using java to run the programs, it gives Exception found. I am using Ubuntu 12.04 without internet connections. Also, installed Oracle JDK7 and JRE7. Also did the update-alternatives command on java, javac and javaws. Changed the machine java in /etc/profiles. PATH is pointing to oracle java folder. I did many searches on Google about this topic but each time jdk and jre version are different. Also check version of jdk and jre using java -version and javac - version. Both of them are the same. The system also contains OpenJdk6 and OpenJdk7. So, how do I remove these errors?

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  • How much a website like bytes.com earn

    - by robin das
    i am running a website similar to bytes.com (IT QnA site) my site attract 600 unique visitors daily. we are planning our self as bytes.com. Atleast any one can tell me that whether we can earn some serious money with this kind of website. websiteoutlook estimate Daily Pageview - 700636 to bytes.com Can any one please let me know what kind of earning we can expect for dotcom like bytes.com. Please give some light on this topic as a lot of energy, time and money goes in building this kind of website thanks robin Das

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  • Ubuntu doesn't boot after 11.10 upgrade from 11.04

    - by Gio Borje
    Had this problem earlier: Crash after update to 11.10, from 11.04; ran the solution and had everything updated and upgraded. I get the following lines after booting with some of the preceding start, stop an [OK] lines as the other topic. * Checking battery state... [ 21.640534] btusb_intr_complete: hci0 urb ffff88011e948480 failed to resubmit (19) [ 21.640690] btusb_bulk_complete: hci0 urb ffff88011e948cc0 failed to resubmit (19) [ 21.640734] btusb_bulk_complete: hci0 urb ffff88011e9480c0 failed to resubmit (19) I run tty2 and execute startx to start the GUI that I'm using right now but Ubuntu won't boot without it.

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  • What are effective marketing strategies for iPhone games?

    - by Artemix
    So, long story short, some days ago I published an iPhone game, I think the game wasn't that bad tbh, and still I got only 10 sells at $0.99. Are they any publishers, sponsors, or distributors to make your game "visible" on the app store market?, or the only thing you need is to have an amazing game and that's all? Somehow I think that even if you have an awesome game if you don't do that "marketing magic" correctly you will not exist in the store. Now I'm making a second game, completely different, and I want to know how to do things right. If anyone knows something about this topic, let me know.

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  • Understanding #DAX Query Plans for #powerpivot and #tabular

    - by Marco Russo (SQLBI)
    Alberto Ferrari wrote a very interesting white paper about DAX query plans. We published it on a page where we'll gather articles and tools about DAX query plans: http://www.sqlbi.com/topics/query-plans/I reviewed the paper and this is the result of many months of study - we know that we just scratched the surface of this topic, also because we still don't have enough information about internal behavior of many of the operators contained in a query plan. However, by reading the paper you will start reading a query plan and you will understand how it works the optimization found by Chris Webb one month ago to the events-in-progress scenario. The white paper also contains a more optimized query (10 time faster), even if the performance depends on data distribution and the best choice really depends on the data you have. Now you should be curious enough to read the paper until the end, because the more optimized query is the last example in the paper!

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  • Memory Management/Embedded Management in C

    - by Sauron
    Im wondering if there is a set or a few good books/Tutorials/Etc.. that go into Memory Management/Allocation Specifically (or at least have a good dedicated section to it) when it comes to C. This is more for me learning Embedded and trying to keep Size down. I've read and Learned C fine, and the "standard" Learning books. However most of the books don't spend a huge amount of time (Understandably since C is pretty huge in general) going into the Finer details about whats going on Down Under. I saw a few on Amazon: http://www.amazon.com/C-Pointers-Dynamic-Memory-Management/dp/0471561525 http://www.amazon.com/Understanding-Pointers-C-Yashavant-Kanetkar/dp/8176563587/ref=pd_sim_b_1 (Not sure how relevant this would be) A specific Book for Embedded that has to do with this would be nice. But Code Samples or...Heck tutorials or anything about this topic would be helpful!

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  • How to promote travel blog? [closed]

    - by Tschareck
    Possible Duplicate: What are the best ways to increase your site's position in Google? How can I increase the traffic to my site? I know this question might seem a little off topic, but blogging may become important part of travel. Nowadays, in time of Facebook, Twitter and similar services, keeping a travel blog may seem a little archaic. It's not 2005 anymore. But a lot of my travel colleagues update their blogs and have significant number of readers. I also tried to keep my blog when I travel. However it seems that the only reader is my mum ;) What is your advice on promoting a travel blog?

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  • Seeking questions about creating Microsoft Live Labs Pivot collections

    - by John Conwell
    I've spent the past 3 weeks working a lot with Pivot from Microsoft Live Labs (http://getpivot.com/).  Pivot is a tool that allows you to visually explore data. Its an interesting take on visual data mining. Anyway, I've been writing a lot of code that creates a hierarchy of Pivot collections, where one item in the collection drills down into an entirly new collection. The dev community around Pivot is still very young, so there isnt much tribal knowledge built up yet.  I've spent a lot of time trying to get things to work through trial and error, as well as digging around in Reflector.  But I've finally got a framework built for programatically creating DeepZoom images, Pivot collections, Sparse Images, etc.   If anyone has any questions, or suggestions on a post topic, leave a comment and I'll try and answer your question.

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  • Applying prerecorded animations to models with the same skeleton

    - by Jeremias Pflaumbaum
    well my question sounds a bit like, how do I apply mo-cap animations to my model, but thats not really it I guess. Animations and model share the same skeleton, but the models vary in size and proportion, but I still want to be able to apply any animation to any model. I think this should be possible since the models got the same skeleton bone structure and the bones are always in the same area only their position varies from model to model. In particular Im trying to apply this to 2D characters that got 2arm, 2legs, a head and a body, but if you got anything related to that topic even if its 3D related or keywords, articles, books whatever Im gratefull for everything cause Im a bit stuck at the moment. cheers Jery

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  • How to add a link group to update-alternatives?

    - by Kurtosis
    Is it possible to add a custom link group to update-alternatives that is not already there by default? For example, I want to add Scala and all its supporting binaries as a link group 'scala'. I'm trying using this script, but keep getting the error: update-alternatives: error: unknown argument `' I'm not sure what that means, but after troubleshooting the script a bit with no luck, I'm wondering if update-alternatives has a hard-coded list of link groups, that can't be added to, and that doesn't include scala. PS - any chance someone with higher karma can create an update-alternatives tag? Seems this topic gets a decent number of questions, but no tag for it.

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  • Selling your iphone games.

    - by Artemix
    Hi. So, long story short, some days ago I pusblished an iPhone game, I think the game wasnt that bad tbh, and still I got only 10 sells at $0.99. Are they any publishers, sponsors, or distributors to make your game "visible" on the app store market?, or the only thing you need is to have an amazing game and thats all? Somehow I think that even if you have an awesome game if you dont do that "marketing magic" correctly you will not exist in the store. Now Im making a second game, completly different, and I want to know how to do things right. If anyone knows something about this topic, let me know. Thx in advance.

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  • How to handle multiple domains correctly? [closed]

    - by Eric Itzhak
    Possible Duplicate: Could I buy a domain name to increase traffic to my site like this? I have a website with multiple keyword based domains ( 2 actully) Now both domains are common google searches for the topic. What i'm intrested is to handle the domains as such that google can recognize the seconed domain with the same page rank as the primary domain, so it will also appear on the first page. My question is how do i do it correctly so i will help SEO? meaning i want the 2nd domain to be on the first page, because the primary is on the first page for it's keyword. do i simple put a redirect in the index.php file? Or to do a 301 redirect? or change the .htaccess file? Or create a domain pointer in the Control panel?

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  • Webcast WebCenter Content, April 11th, 2012

    - by rituchhibber
    Our next WebCenter Content webcast will be on April 10th, 2012. This WebCast will help you to prepare yourself for the WebCenter Content Certified Implementation Specialist EXAM. Webcast Details: Date Topic Speaker Web Call Details Intercall Details  April 10th                WebCenter Content   Refresh     Course      Markus NeubauerSilburyWebCenter ContentSpecialized Partner Join Webcast Dial-in numbers:CC/SP: 1579222/9221 Time: 12:00 -15:00 CET Break around 13:30 Conference ID/Key: 9819145/1004 For more details, please click here.

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  • Good ergonomic keyboards for ruby/rails programmer using vim (on Mac) [closed]

    - by Brand
    I'm looking to buy an ergonomic keyboard but I'm unable to find answers for my specific needs. I'm a programmer so I need to be able to have quick/easy access to my curly brace and bracket keys. I use vim extensively so having the ctrl and esc keys in a easier to reach location would help. I'm also a mac user (doing ruby/rails dev). With all these things in mind, what are some good options for ergonomic keyboards? I'm afraid someone will see this as "off topic" but please realize I need to ask fellow programmers. For example, I was thinking of the Kinesis Keyboard but read some reviews saying it's not good for programming. That's when I realized other programmers would be the best at answering this question.

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  • Can I get enough experience to get an industry job just by reading books?

    - by MahanGM
    I've been recently working with DirectX and getting familiar with game engines, sub-systems and have done game development for the last 5 years. I have a real question for those whom have worked in larger game making companies before. How is it possible to get to into these big game creators such as Ubisoft, Infinity Ward or EA. I'm not a beginner in my field and I'm going to produce a real nice 2D platform with my team this year, which is the result of 5 years 2D game creation experience. I'm working with prepared engines such as Unity3D or Game Maker software and using .Net with C# to write many tools for our production and proceeding in my way but never had a real engine programming experience 'till now. I'm now reading good books around this topic but I wanted to know: Is it possible to become an employee in big game company by just reading books? I mean beside having an active mind and new ideas and being a solution solver.

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  • Developer Webinar Today: "Writing Solaris 11 Device Drivers"

    - by user13333379
    Oracle's Solaris Organization is pleased to announce a Technical Webinar for Developers on Oracle Solaris 11: "Writing Solaris 11 Device Drivers" By Bill Knoche (Principal Software Engineer) today June 5, 2012 9:00 AM PDT This bi-weekly webinar series (every other Tuesday @ 9 a.m. PT) is designed for ISVs, IHVs, and Application Developers who want a deep-dive overview about how they can deploy Oracle Solaris 11 into their application environments. This series will provide you the unique opportunity to learn directly from Oracle Solaris ISV Engineers and will include LIVE Q&A via chat with subject matter experts from each topic area. Any OTN member can register for this free webinar here. 

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  • Getting "boot error" when trying to boot from USB

    - by Jon Ball
    I'm wanting to try out Ubuntu, so followed the instructions for how to install Ubuntu onto a USB. I downloaded the .iso file, then the pendrivelinux 3 part process to make the USB bootable. I can see what looks like a full list of files on the USB (including the wubi.exe application and the syslinux folder). When I try to restart the computer with the USB in, I get the Dell start up screen, and then a black screen with "Boot Error" in the top right hand corner. Setup options (default) are to boot from Removable Device, then Hard Disc. USB is brand new, straight out of the packet. Computer: Dell Inspiron 530S BIOS: 1.0.13 OS: Windows Vista Home Edition USB: EMTEC 8Gb, formatted to FAT32 I've tried some of the tips in other help topics (holding down CTRL key while restarting, removing all other USB devices). I tried to reformat the USB to something other than FAT32, but my only other options were NTFS or exFAT (not FAT16 which was suggested in another topic).

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  • How to improve quality of software

    - by hariharan
    Last week in our organization, we triggered a topic related to different ways of improving the quality of software (both technical as well as functional related topics). Since i am a technical person, i suggested following ideas, Use case based detailed design document – Both technical as well as functional specification should be well organized according to use case requirement. Design patterns – Will help developers to adopt common approach irrespective of technologies. Analyze and implement new technologies – Helps to improve the performance as well as the security of the application. As I am not a well experienced technical candidate , i am unable to provide other solutions. If any suggestions or topics related to this (including testing, functional requirement), please post your valuable comments.

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  • Designing a simple snake A.I

    - by DillPixel
    I've looked at some stuff online regarding this specific topic, and a lot of the info that I read involved graphs and path finding. I really don't want to get involved in something too complex & out of my level, and also I don't need my snake to be that intelligent (it will be a large board with the snake not growing in size on every munch). How could you structure a simpler AI for the snake that gets the job done relatively well? I would be able to get the snake to move towards the food item correctly, but my issue is that I'm not sure how to deal with the snake colliding with itself. Say the snake has a look ahead, and it finds that its tail is in the way, it could change direction, but what happens next? Any ideas on how to tackle this? Should the snake build an instruction set from every square, or should it think on the go?

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  • How to create an auto-grader in and for Python

    - by recluze
    I'm trying to create an auto-grader for one of my beginning programming courses for python. From my online search, I've come to know that it is effectively a unit test framework that tests the student's code rather than production code but I'm not really sure how to structure the flow of the program. Can anyone please provide a strategy for submission of code by students and automating the whole process of marking? For instance, how would the student code be submitted and then stored/structured on disk, how would the grades be stored/reported? I'm only looking for a broad strategy and will try on my own to fill in the blanks. (I asked this on stockoverflow.com initially but it's considered as off-topic and I was suggested to ask here.)

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  • Making an efficient collision detection system

    - by Sri Harsha Chilakapati
    I'm very new to game development (just started 3 months ago) and I'm learning through creating a game engine. It's located here. In terms of collision, I know only brute-force detection, in which case, the game slows down if there are a number of objects. So my question is How should I program the collisions? I want them to happen automatically for every object and call the object's collision(GObject other) method on each collision. Are there any new algorithms which can make this fast? If so, can anybody shed some light on this topic?

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  • More confusion over SEO Cname and 301 redirect

    - by Alasdair
    Previous answers on this topic don't really help me with my query, so any help appreciated for a bit of a newbie. I have a new domain "domain#1.mobi" Its hosted with godaddy and has a cname and forwarding, pointing it to "domain#1.elsewhere.us" It has no content. The content is all hosted on "domain#1.elsewhere.us" which is what Google is now listing in its results. I want Google to ignore that and only list "domain#1.mobi" in its listings. How do I achieve this?

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  • Algorithm to calculate trajectories from vector field

    - by cheeesus
    I have a two-dimensional vector field, i.e., for each point (x, y) I have a vector (u, v), whereas u and v are functions of x and y. This vector field canonically defines a set of trajectories, i.e. a set of paths a particle would take if it follows along the vector field. In the following image, the vector field is depicted in red, and there are four trajectories which are partly visible, depicted in dark red: I need an algorithm which efficiently calculates some trajectories for a given vector field. The trajectories must satisfy some kind of minimum denseness in the plane (for every point in the plane we must have a 'nearby' trajectory), or some other condition to get a reasonable set of trajectories. I could not find anything useful on Google on this, and Stackexchange doesn't seem to handle the topic either. Before I start devising such an algorithm by myself: Are there any known algorithms for this problem? What is their name, for which keywords do I have to search?

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  • AngularJS: structuring a web application with multiple ng-apps

    - by mg1075
    The blogosphere has a number of articles on the topic of AngularJS app structuring guidelines such as these (and others): http://www.johnpapa.net/angular-app-structuring-guidelines/ http://codingsmackdown.tv/blog/2013/04/19/angularjs-modules-for-great-justice/ http://danorlando.com/angularjs-architecture-understanding-modules/ http://henriquat.re/modularizing-angularjs/modularizing-angular-applications/modularizing-angular-applications.html However, one scenario I have yet to come across for guidelines and best practices is the case where you have a large web application containing multiple "mini-spa" apps, and the mini-spa apps all share a certain amount of code. I am not referring to the case of trying to have multiple ng-app declarations on the same page; rather, I mean different sections of a large site that have their own, unique ng-app declaration. As Scott Allen writes in his OdeToCode blog: One scenario I haven't found addressed very well is the scenario where multiple apps exist in the same greater web application and require some shared code on the client. Are there any recommended approaches to take, pitfalls to avoid, or good sample structures of this scenario that you can point to?

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