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• Complicated MySQL query?

  - by Scott

  I have two tables: RatingsTable that contains a ratingname and a bit whether it is a positive or negative rating: Good 1 Bad 0 Fun 1 Boring 0 FeedbackTable that contains feedback on things...the person rating, the rating and the thing rated. The feedback can be determined if it's a positive or negative rating based on RatingsTable. Jim Chicken Good Jim Steak Bad Ted Waterskiing Fun Ted Hiking Fun Nancy Hiking Boring I am trying to write an efficient MySQL query for the following: On a page, I want to display the the top 'things' that have the highest proportional positive ratings. I want to be sure that the items from the feedback table are unique...meaning, that if Jim has rated Chicken Good 20 times...it should only be counted once. At some point I will want to require a minimum number of ratings (at least 10) to be counted for this page as well. I'll want to to do the same for highest proportional negative ratings, but I am sure I can tweak the one for positive accordingly.

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• Typical tasks/problems to demonstrate differences between programming languages

  - by Space_C0wb0y

  Somewhere some guy said (I honestly do not know where I got this from), that one should learn one programming language per year. I can see where that might be a good idea, because you learn new patterns and ways to look at the same problems by solving them in different languages. Typically, when learning a new language, I look at how certain problems are supposed to be solved in that language. My question now is, what, in you experience, are good, simple, and clearly defined tasks that demostrate the differences between programming languages. The Idea here is to have a set of tasks, that, when I solve all of them in the language I am learning, gives me a good overview of how things are supposed to be done in that language. I do not know if that is even possible, but it sure would be a useful thing to have. A typical example one often sees especially in tutorials for functional languages is the implementation of quicksort.

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• Easiest, free way to start with Flex?

  - by Jon

  I'm interested in getting started with Flex, as I've wanted to work with flash for quite awhile but have never liked the designer-oriented way of programming. I've heard flex can be used for free, and is programmer friendly, but I'm having some issues... I can't find any good sites with flex resources. I'm used to PHP, so maybe I'm spoiled with a full manual, comments and tutorials, but I can't even find a decent tutorial site. So, what are some good flex starts to get started, and what's a good, free IDE to program with?

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• Selecting all but one field?

  - by gsquare567

  instead of SELECT * FROM mytable, i would like to select all fields EXCEPT one (namely, the 'serialized' field, which stores a serialized object). this is because i think that losing that field will speed up my query by a lot. however, i have so many fields and am quite the lazy guy. is there a way to say... `SELECT ALL_ROWS_EXCEPT(serialized) FROM mytable` ? thanks!

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• Your favorite open source tool (that is not very famous)

  - by sucuri

  I believe every system admin is used to open source by now. From Apache to Firefox or Linux, everyone uses it at least a little bit. However, most open source developers are not good in marketing, so I know that there are hundreds of very good tools out there that very few people know. To fill this gap, share your favorite open source tool that you use on your day by day that is not very famous. *I will post mine in the comments.

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• how can we avoid allocation done by Marshal::StringToHGlobalAnsi?

  - by KaluSingh Gabbar

  my wrapper from managed to unmanaged is handling a lot of data and this Guy would call new for each of them, which is a big hit for me. So my question is : can I allocate a chunk of unmanaged memory and use it to convert the managed data types to unmanaged by hand.

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• OpenDB Alternative

  - by shaiss

  Although a good tool OpenDB hasn't been updated since 12/2008. The source code shows some recent activity, but still sparse at best. Anyone know of good web based cataloging alternatives? I'm looking to catalog the 500+ software CD's we have. Also, as a side note. OpenDB will handle software, but you have to create a custom media type, which is a PAIN!!!

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• Camera and Image recognition

  - by kjh

  I recently watched a youtube video where a guy got a camera to recognize when a rubik's cube was held up to it, and it captured the 9 square color combination before snapping a picture of the cube and displaying the 3x3 grid on the screen of his computer. What kind of programming is this and where would I start reading to get into this sort of thing? specifically, controlling a camera, and getting it to pick out certain parts of an image and translate that data.

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• How much traffic is high-traffic [closed]

  - by Jack

  My primary interest is in gathering information about the technology used behind public facing websites. Much of the information I read arbitrarily differentiates between high-traffic vs the unstated non-high-traffic websites. This troubles me because I don't have a good grasp of how much traffic is high-traffic. Can anyone help me with this, is there a good rule of thumb? Please don't tell me it depends ;)

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• Where are all the important files and folders in Ubuntu?

  - by ajsie

  I searched on Google but i couldn't find a good page listing all the important files and folders in Ubuntu. Does anyone know a good source?

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• My internet speed became slow at night

  - by FrozenKing

  My internet plan is 512kbps unlimited and I get speed of average 64kbps but at night I used to get speed of 112kbps ..but recently my speed got normal like day time ...as per my view usually at night their is less traffic so I should get good speed like before ... Due to good speed I download and upload at night and my average download+upload per month is 60gb or 70gb... Is it that my ISP people putting restriction on my download and uploads.. I am confused.

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• Python: User-Defined Exception That Proves The Rule

  - by bandana

  Python documentations states: Exceptions should typically be derived from the Exception class, either directly or indirectly. the word 'typically' leaves me in an ambiguous state. consider the code: class good(Exception): pass class bad(object): pass Heaven = good() Hell = bad() >>> raise Heaven Traceback (most recent call last): File "<pyshell#163>", line 1, in <module> raise Heaven good >>> raise Hell Traceback (most recent call last): File "<pyshell#171>", line 1, in <module> raise Hell TypeError: exceptions must be classes or instances, not bad so when reading the python docs, should i change 'typically' with ''? what if i have a class hierarchy that has nothing to do with the Exception class, and i want to 'raise' objects belonging to the hierarchy? i can always raise an exception with an argument: raise Exception, Hell This seems slightly awkward to me What's so special about the Exception class, that only its family members can be raised?

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• Mobile Internet Problem

  - by alskndalsnd

  I am using mobile dial up on ubuntu. However, SOMETIMES even though I am connected to the ISP, I do not have any entries in /etc/resolv.conf. I often restart network-manager or networking hoping it will change but normally it doesn't do any good. and by connected I mean I can see that the network notification icon has switched to a few bars indicating connectivity). Anyone know a good solution around this?

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• What kind of routes could I get back from kAudioSessionProperty_AudioRoute property?

  - by mystify

  Apple guy tried to be funny and wrote in the docs: ("Headphone," "Speaker," etc.) What kind of return values are possible in reality?

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• ZFS recordsize for VirtualBox and other virtual disks

  - by JOTN

  Has anyone run across any good benchmarks or other research on tuning the ZFS recordsize when putting virtual disk files on it for a guest OS? I'm using VirtualBox at the moment. I have notice significant performance improvement when working with a DBMS by setting the ZFS recordsize to the same as the DB blocksize, so I'm guessing matching the blocksize of the guest filesystem would also be a good idea.

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• Mathematics for AI/Machine learning ?

  - by Ankur Gupta

  I intend to build a simple recommendation systems for fun. I read a little on the net and figured being good at math would enable on to build a good recommendation system. My math skills are not good. I am willing to put considerable efforts and time in learning maths. Can you please tell me what mathematics topics should I cover? Also if any of you folks can point me to some online material to learn from it would be great. I am aware of MIT OCW, book like collective intelligence. Math Topics to cover and from where to read would really help.

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• Computer class or home teaching for kids?

  - by JMarsch

  I want to teach my son to be a strong PC user. I could try to strike out on my own for this, but I was wondering if there is a good online (or book based) course for this. Like most kids, he's proficient with Google, YouTube, and Minecraft, but he's very curious, and I would like to teach him more. Even some basic excercises, like working with the file system would be good for him (i would need some help to not make it boring).

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• How can I know where a Null Pointer Exception originated?

  - by navand

  I had a problem making a Blackberry app. I found some guy who made a tutorial which did what I attempted with mine. I copied the code of the tutorial's app to try and recreate it, just to see it in action. The result: Null Pointer Exception. I want to know what is triggering this. How can I?

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• Java source code generation frameworks

  - by Superfilin

  I have a set of Java 5 source files with old-style Doclet tags, comments and annotations. And based on that I would like to write a generator for another set of Java classes. What is the best way to do that? And are there any good standalone libraries for code analysis/generation in Java? Any shared exprience in this field is appreciated. So, far I have found these: JaxME's Java Source Reflection - seems good, but it does not seem to support annotations. Also it had no release since 2006. Annogen - uses JDK's Doclet generator, which has some bugs under 1.5 JDK. Also it had no releases for a long time. Javaparser - seems good as well and pretty recent, but only supports Visitor pattern for a single class i.e. no query mechanism like in the 2 above packages.

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• Pass errors in Django using HttpResponseRedirect

  - by JPC

  I know that HttpResponseRedirect only takes one parameter, a URL. But there are cases when I want to redirect with an error message to display. I was reading this post: How to pass information using an http redirect (in Django) and there were a lot of good suggestions. I don't really want to use a library that I don't know how works. I don't want to rely on messages which, according to the Django docs, is going to be removed. I thought about using sessions. I also like the idea of passing it in a URL, something like: return HttpResponseRedirect('/someurl/?error=1') and then having some map from error code to message. Is it good practice to have a global map-like structure which hard codes in these error messages or is there a better way? Or should I just use a session EDIT: I got it working using a session. Is that a good practice to put things like this in the session?

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• Looking for network monitoring software for Win7 x64 (similar to the one included with Sunbelt perso

  - by rep_movsd

  I've upgraded from Windows XP to Windows 7 (64bit) and I found that the very convenient Sunbelt Kerio Personal Firewall will not work on this version. I hear the Windows 7 firewall is good enough(even though it never prompts for outbound connections) but Kerio had a nice network monitor feature which showed all applications with inbound and outbound connections and the current speed and bytes transferred for each one. Is there any software out there that can give me similar monitoring as what Kerio does? TCPView is almost as good, but doesnt show transfer statistics.

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• Iphone apps development.

  - by dicaprio

  I'm very keen to learn Iphone apps development. Can you experts give me some tips as to which programing tool I should learn? tools I should install [of course , I prefer free tools]?, operating system I need? [I only have windows xp and unix flavours on my Personal laptop]. Do I need to have Iphone to test my apps? [poor guy, I don't own a Iphone].

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• Can you use zero-width matching regex in String split?

  - by polygenelubricants

  System.out.println( Arrays.deepToString( "abc<def>ghi".split("(?:<)|(?:>)") ) ); This prints [abc, def, ghi], as if I had split on "<|>". I want it to print [abc, <def>, ghi]. Is there a way to work some regex magic to accomplish what I want here? Perhaps a simpler example: System.out.println( Arrays.deepToString( "Hello! Oh my!! Good bye!!".split("(?:!+)") ) ); This prints [Hello, Oh my, Good bye]. I want it to print [Hello!, Oh my!!, Good bye!!]. `.

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• Total RAM % from perfmon Windows Server 2008 R2

  - by Xaxum

  I am trying to find a good way to get available RAM percentage from perfmon. I can get Available Mbytes but I can't find any way to get the total installed memory on the server or what is in use via perfmon. I can obviously alert on GB but each of my servers have different total RAM so not a great alert. The way I understand % Committed Bytes is this includes page files on disk so this is not a good indicator. Any help would be appreciated.

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• HTML - Which element to output text?

  - by Oliver Weiler

  I'm implementing a little chat application where I receive messages from a server, which I would like to display to a user. As I'm more of a backend guy, and lacking experience in frontend development, I don't know which element would be suited best to output the text. Two options come to my mind: Using a plain div Using a textarea (as far as I understand, this is intended to be used for input). (Would also be nice if I could somehow fade in the text using JQuery).

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