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  • In SQL, what's the difference between count(column) and count(*)?

    - by Bill the Lizard
    I have the following query: select column_name, count(column_name) from table group by column_name having count(column_name) > 1; What would be the difference if I replaced all calls to count(column_name) to count(*)? This question was inspired by a previous one. Edit: To clarify the accepted answer (and maybe my question), using count(*) in this case returns an extra row in the result that contains a null and the count of null values in the column.

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  • Arrow keys with NSTableView

    - by dreamlax
    Is it possible to navigate an NSTableView's editable cell around the NSTableView using arrow keys and enter/tab? For example, I want to make it feel more like a spreadsheet. The users of this application are expected to edit quite a lot of cells (but not all of them), and I think it would be easier to do so if they didn't have to double-click on each cell.

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  • Installing Python in Windows XP

    - by Sam
    My work PC has restrictions that stop me from adding programs to the start menu so when I try to install Python using the Python 2.6.5 Windows installer it can't complete as it tries to add a shortcut to my start menu. Is there a way around this? I.e another way of installing without the need for a shortcut? Edit: I'll also need to install NumPy which I can't do on the Portable version of Python.

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  • What should be the considerations for choosing SQL/NoSQL?

    - by Yuval A
    Target application is a medium-sized website built to support several hundred-thousand users an hour, with an option to scale above that. Data model is rather simple, and caching potential is pretty high (~10:1 ratio of read to edit actions). What should be the considerations when coming to choose between a relational, SQL-based datastore to a NoSQL option (such as HBase and Cassandra)?

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  • running python from an android app

    - by Stacia
    Hi everyone, I am trying to run a python script through an application I've written. I found some pages which say that this piece of code is doing it, but I can't figure it out. http://code.google.com/p/android-scripting/source/browse/android/AndroidScriptingEnvironment/src/com/google/ase/locale/LocaleReceiver.java Can someone explain what is going on and how I can edit that to run an arbitrary script file in my project directory?

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  • Is it possible to do some interop with iWork?

    - by Alerty
    I know it is possible with the .NET framework of Microsoft to do some interoperability with Microsoft Office. Is there something that exist that resembles to it for iWork and the Cocoa framework? Edit: Here are more details. I would like to create an application that has a GUI and that can generate Pages/Keynote/Numbers documents.

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  • What is an XYZ-complete problem?

    - by TheMachineCharmer
    EDIT: Diagram: http://www.cs.umass.edu/~immerman/complexity_theory.html There must be some meaning to the word "complete" its used every now and then. Look at the diagram. I tried reading previous posts about NP- My question is what does the word "COMPLETE" mean? Why is it there? What is its significance? N- Non-deterministic - makes sense' P- Polynomial - makes sense but the "COMPLETE" is still a mystery for me.

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  • Drupal html user id

    - by msindle
    I'm using Drupal 6.16: I think I have a pretty simple question. How can I get the current user id and put it in a menu tab. What I would like to happen is when the user logs in and wants to change their their name, email etc to click a menu tab. I image it would look something like this: http://domain.com/user/{userid}/edit Thanks in advance! msindle

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  • Suppressing "extra ';'" error in GCC when -pedantic is on

    - by Roman D
    Hi all, I'm building my program with -pedantic flag, which causes an extra ';' error (because of a third-party header using a few macros inconsistently; the error is not shown when -pedantic is off). I don't really feel like turning -pedantic off, and neither do I want to edit the header. Is there any way to suppress this exact error? Like a -Wno-annoying-semicolon-error compiler switch or something?

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  • ASP.NET MVC users - do you miss anything from WebForms?

    - by Richard Ev
    There are lots of articles and discussions about the differences between ASP.NET WebForms and ASP.NET MVC that compare the relative merits of the two frameworks. I have a different question for anyone who has experience using WebForms that has since moved to MVC: What is the number one thing that WebForms had, that MVC doesn't, that you really miss? Edit No-one has mentioned the WebForms validation controls. I am now working on some code that has a few dependant validation rules and implementing client-side validation for these is proving slow.

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  • How can I capture the keystroke that triggers "CellEndEdit" on a DataGridView in C#?

    - by Andy Stampor
    I have a DataGridView that is set to EditOnF2. I do some special processing of data in the CellEndEdit eventhandler that sets the value of the cell. I still want the functionality of the EditOnKeystrokeOrF2 of reverting to the original value when the Esc key is pressed. Unfortunately, at the CellEndEdit eventhandler, I don't see a way to tell what caused the CellEndEdit event to be fired. I only want to change the value of the cell if the Esc key is not pressed. How can I tell if it was or not? Edit: It is worth noting that the KeyDown event does not get fired when the cell is being edited, nor for the final ending keystroke. Edit2: I have tried the KeyPreview suggestion, but the form still does not capture the Escape key being pressed. Edit3: I've been experimenting with trying to get this working. I originally posted some of the following as a separate post, but feel it might be more relevant to include it here. I have a cell in a DataGridView that is now set to EditProgrammatically. To capture the keystroke that starts an edit, I am setting the cell.Value equal to the keystroke. However, this ruins the "Escape" functionality of the cell - when you press escape, instead of reverting to the original value, it reverts to the keystroke that I programmatically inserted into the cell. I believe that if I could set the "EditedFormattedValue" on a cell, this would be where I want to put my keystroke value, however this appears to be read only. How can I accomplish what I am attempting? An example to clarify: If the cell has a value of "54.3" in it, and I press the "9" key, it begins editing the cell and places a "9" there. If I hit Escape, instead of reverting to "54.3" it reverts to "9". What I want is for it to return to its original value of "54.3". So, I am trying to tackle this issue from both the beginning and the end. I think the real problem is that I am overwriting the original value and have no way to determine if I should revert it or not. Edit4: It looks like CellValidating might be worth using, but I am seeing strange behavior when I experiment with it. In a new project, I create the DataGridView and register for the various events and see that CellValidating is fired before the CellEndEdit. However, in my project where I am trying to get this to work, CellEndEdit is firing BEFORE CellValidating. Any ideas on what the difference might be?

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  • Friend WCF Web Service Reference

    - by Bram
    Is it possible to make a WCF reference in a Silverlight DLL private? The option is greyed out and when you edit the Reference.vb file manaully, when running, it complains about not being able to serialize because it is not public. I don't want the service to be exposed outside of the DLL. Is this possible?

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  • remove duplicate code in java

    - by Anantha Kumaran
    class A extends ApiClass { public void duplicateMethod() { } } class B extends AnotherApiClass { public void duplicateMethod() { } } I have two classes which extend different api classes. The two class has some duplicate methods(same method repeated in both class) and how to remove this duplication? Edit The ApiClass is not under my control

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  • Any way to automatically wrap comments at column 80 in Visual Studio 2008? ..or display where column

    - by Jon Cage
    Is there any way to automatically wrap comments at the 80-column boundary as you type them? ..or failing that, any way to display a faint line at the coulmn 80 boundary to make wrapping them manually a little easier? Several other IDEs I use have one or other of those functions and it makes writing comments that wrap in sensible places much easier/quicker. [Edit] If (like me) you're using Visual C++ Express, you need to change the VisualStudio part of the key into VCExpress - had me confused for a while there!

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  • Report Generator using templates

    - by well son
    Hi all I'd like to a suitable programming language/software that I can use to generate a report of PDF/DOC using a template of my choice. As I currently have to manually edit, add things in report, I like to automate it by softwares. Thank you.

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  • Where is cck "number of values" data stored?

    - by calebthorne
    I have a cck field that needs to allow a different number of values depending on the role of the currently logged in user. I'd like to find where the "number of values" data is stored for a cck field so that it can be dynamically changed when the node edit form is displayed.

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  • Bracketing algorithm when root finding. Single root in "quadratic" function

    - by Ander Biguri
    I am trying to implement a root finding algorithm. I am using the hybrid Newton-Raphson algorithm found in numerical recipes that works pretty nicely. But I have a problem in bracketing the root. While implementing the root finding algorithm I realised that in several cases my functions have 1 real root and all the other imaginary (several of them, usually 6 or 9). The only root I am interested is in the real one so the problem is not there. The thing is that the function approaches the root like a cubic function, touching with the point the y=0 axis... Newton-Rapson method needs some brackets of different sign and all the bracketing methods I found don't work for this specific case. What can I do? It is pretty important to find that root in my program... EDIT: more problems: sometimes due to reaaaaaally small numerical errors, say a variation of 1e-6 in some value the "cubic" function does NOT have that real root, it is just imaginary with a neglectable imaginary part... (checked with matlab) EDIT 2: Much more information about the problem. Ok, I need root finding algorithm. Info I have: The root I need to find is between [0-1] , if there are more roots outside that part I am not interested in them. The root is real, there may be imaginary roots, but I don't want them. Probably all the rest of the roots will be imaginary The root may be double in that point, but I think that actually doesn't mater in numerical analysis problems I need to use the root finding algorithm several times during the overall calculations, but the function will always be a polynomial In one of the particular cases of the root finding, my polynomial will be similar to a quadratic function that touches Y=0 with the point. Example of a real case: The coefficient may not be 100% precise and that really slight imprecision may make the function not to touch the Y=0 axis. I cannot solve for this specific case because in other cases it may be that the polynomial is pretty normal and doesn't make any "strange" thing. The method I am actually using is NewtonRaphson hybrid, where if the derivative is really small it makes a bisection instead of NewRaph (found in numerical recipes). Matlab's answer to the function on the image: roots: 0.853553390593276 + 0.353553390593278i 0.853553390593276 - 0.353553390593278i 0.146446609406726 + 0.353553390593273i 0.146446609406726 - 0.353553390593273i 0.499999999999996 + 0.000000040142134i 0.499999999999996 - 0.000000040142134i The function is a real example I prepared where I know that the answer I want is 0.5 Note: I still haven't check completely some of the answers I you people have give me (Thank you!), I am just trying to give al the information I already have to complete the question.

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  • Rails 3 Nested Forms with datamapper

    - by jens freudenau
    i have two models: class MeetingPoint include DataMapper::Resource belongs_to :profile property :id, Serial property :lat, String end and class Profile include DataMapper::Resource has n, :meeting_points property :id, Serial property :distance, Text property :created_at, DateTime property :updated_at, DateTime end Now I create a form to edit the profile and the meeting_poing: = form_for @profile do |f| = f.text_field :distance = f.fields_for :meeting_points do |ff| = ff.text_field :lat = f.submit But when I want to save the values I get always the error: "undefined method `readonly?' for ["lat", "14.000"]:Array"

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