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  • Greatest not null column

    - by Álvaro G. Vicario
    I need to update a row with a formula based on the largest value of two DATETIME columns. I would normally do this: GREATEST(date_one, date_two) However, both columns are allowed to be NULL. I need the greatest date even when the other is NULL (of course, I expect NULL when both are NULL) and GREATEST() returns NULL when one of the columns is NULL. This seems to work: GREATEST(COALESCE(date_one, date_two), COALESCE(date_two, date_one)) But I wonder... am I missing a more straightforward method?

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  • Media Disconnected Networking Issue

    - by Chris
    After rearranging my physical network in my apartment my Windows Vista machine can no longer connect to the network. I have tested all of the cabling by connecting other devices and everything is fine. I'm able to connect using other computers, I've even tested a brand new ethernet adapter and the network status still reads "media disconnected". I have no idea where to go from here. My setup is as follows: Cable modem - router - hardwired ethernet cable to computer.

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  • determine if line segment is inside polygon

    - by dato
    suppose we have simple polygon(without holes) with vertices (v0,v1,....vn) my aim is to determine if for given point p(x,y) any line segment connecting this point and any vertices of polygon is inside polygon or even for given two point p(x0,y0) `p(x1,y1)` line segment connecting these two point is inside polygon? i have searched many sites about this ,but i am still confused,generally i think we have to compare coordinates of vertices and by determing coordinates of which point is less or greater to another point's coordinates,we could determine location of any line segment,but i am not sure how correct is this,please help me

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  • Why can't I SELECT a parent field that doesn't have a child?

    - by myaccount
    (rest_branches) is the table of restaurants. (phone_numbers) is another table which contains the restaurants phone_numbers, and it has a field called (branch_id) which references the restaurant id. When I try: SELECT * FROM rest_branches NATURAL JOIN phone_numbers I only get the restaurants which have a phone_number. What should I do to get all restaurants even if they don't have a phone number?

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  • Are the ususal database performance-tuning tips invalide for a third-party app like Drupal

    - by Paul Strugger
    When you have a slow database app, the first suggestions that people make is to: Track the slow queries Add appropriate indexes In the case you are building your own application this is very logical, but when you use a CMS like Drupal, that are people have developed and tuned, is this approach valid? I mean, aren't Drupal tables already fine-tuned for performance? Even if I try to see which queries are the slow ones, what could I do about it? Re-write Drupal core?!?

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  • C#, why does Convert.ToBoolean("0") fail?

    - by JL
    I know that trying to convert string "0" to boolean will fail, I also know how to fix this, thanks to Jon Skeets answers on other questions. What I would like to know is WHY does C# not recognise "0" as a valid input for a boolean conversion, surely you could look at it like 0 = false, 1 = true, or even -1 = false and 0 = true, anyways, my logic tells me that it could be a valid input, so is there a very good reason why its not? My bet is old vb6 would be able to recognize the string input "0" as valid.

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  • Is there an easily available implementation of erf() for Python?

    - by rog
    I can implement the error function, erf, myself, but I'd prefer not to. Is there a python package with no external dependencies that contains an implementation of this function? I have found http://pylab.sourceforge.net/packages/included_functions.htmlthis but this seems to be part of some much larger package (and it's not even clear which one!). I'm sorry if this is a naive question - I'm totally new to Python.

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  • Problem with Regex Validator - VAB

    - by sarae
    Hi, I do the validation through configuration files. But, RegexValidator does not work properly. This Validator not disciplined even to unknown regular expression!! Do you know about this problem? Many thanks!!!

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  • How do I remove the alert: "...may not respond to..."

    - by balexandre
    In my .m file I call a method that is inside the same .m file. In the header I have the correct import for the header but I keep getting this alert: What am I doing wrong? What should I do in order to make this error disappear? I'm kinda lost here :-( Even if I changed this to: NSString *path = [[NSString alloc] initWithString:@"...."]; [self parseXMLFileAtURL:path]; [path release];

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  • How improve skills in Java?

    - by kumar kasimala
    I would like to get updates Java and related technogies news on every day so that I will new features of java, even I want to improve java skills by learning existing or new things which is related to logic, therory, programs, How do I get all above details & give me links , so that I will subscribe to it

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  • How to "revert" unchanged files with mercurial?

    - by Virgil
    I have installed Windows7 on my computer, and I had to change all permissions/take ownership - which apparently "touched" all my files, and now everything appears to be "modified" (when I do "hg status"). Is there a command I can run so that I will either "commit" or "revert" all the files that have no actual change in them (i.e. text is unchanged, even if file attributes are changed).

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  • Writing a script with the cmd prompt.

    - by Josh
    I'm trying to make a script that will place a list (in a .csv file) of processes that are running that take up more than 10 mb of RAM and shows the time + date the script was run. My teacher did this during his lecture but I can't remember how he did it. Just trying to figure out how to be better at IT. So my question is, can anyone help me with this? I don't even know where to start.

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  • I need help to disable shadowbox from resizing

    - by Adam
    This overlay seems to be the only overlay plugin that works within my schools wonky template... but the problem is that when the browser is resized the shadowbox resizes too, clipping the contents inside. I want it so the box stats fixed and if the browser does get smaller the browser will have scrollbars. I know it's been modified before, but i dont know where to start. I cant even find an unminified version of the .js file. Thanks

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  • How to stop going to redirected URL in Google App Engine with Python?

    - by user1762586
    I'm using urlfetch from google app engine, but it keeps going to the redirected final page even though I use: result = urlfetch.fetch(classUrl, payload=None, method=urlfetch.GET, headers={}, allow_truncated=False, follow_redirects=False) E.g. if classUrl was a searched term in Google (https://www.google.com/search?q=setInstanceFollowRedirects()+python&oq=setInstanceFollowRedirects()+python&sugexp=chrome,mod=0&sourceid=chrome&ie=UTF-8) it would redirect me to www.google.com How do I stop this redirection? Thanks!

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  • "No Suggestions" in NetBeans

    - by Flexx
    For a few days now I'm using NetBeans 6.8 for doing PHP work. But even if a class-file is included and the methods are public and there's phpDoc used, NetBeans everytime shows "No Suggestions" in the window. E.g. I type $user-> and press CTRL+Space, I do expect all the methods and variables but there aren't shown any. ideas?

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  • ID generator with local static variable - thread-safe?

    - by Poseidon
    Will the following piece of code work as expected in a multi-threaded scenario? int getUniqueID() { static int ID=0; return ++ID; } It's not necessary that the IDs to be contiguous - even if it skips a value, it's fine. Can it be said that when this function returns, the value returned will be unique across all threads?

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