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• [mysql] diff between tables

  - by www.yegorov-p.ru

  I have two tables, with the same structure, for example: table "first' with columns 'a','b','c' and table 'second' with the same columns. How to find difference betweet those two tables? Of course, I can make some script on python, that will make set(a)-set(b), but I think there is some way to do it in mysql.

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• pure as3 benefits to compiling with flex4 instead of flex3?

  - by jedierikb

  If I have a pure as3 project that I have been compiling with flex3 from mxmlc, is there any reason to switch to using the mxmlc with flex4? I can use all of the flash 10 language features like Vector, 3D, etc., so that is not a reason to switch (or is there something I can't do?). But maybe there is a performance boost? Or is the exact same compiling tool and the flex code base is the only difference?

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• Must I Install a Gem to Unpack It?

  - by yar

  I wrote up some instructions for freezing a non-native gem in a Rails app today: install the gem sudo gem install fastercsv put the reference in the environment.rb (I think this is only necessary to do unpack with no GEM specified) config.gem "fastercsv" unpack the gem rake gems:unpack GEM=fastercsv uninstall the gem sudo gem uninstall fastercsv I know this must be the long way around: how can I unpack the gem without installing it first? Also: What's the difference between rake gems:unpack GEM=fastercsv and gem unpack fastercsv?

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• convert Gmt timezone to CET in iPhone?

  - by Rahul Vyas

  I want to convert GMT +530 to CET (Central European Time) in iPhone sdk? does anybody have idea about this? also tell me what is the time difference between these two? Means if time is 10 am in gmt +530 then what it will be in CET?

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• BlackBerry - What does getPreferredWidth() and getPreferredHeight() return??

  - by tek3

  Hi all, I am not getting clear about the concept of getPreferredWidth() and getPreferredHeight() methods. What do they return means on what what basis the values are returned.?? What is difference between getWidth() and getPreferredWidth()??? Thank you..

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• Can I use declare-const to eliminate the forall universal quantifier?

  - by monica

  I have some confusion of using universal quantifier and declare-const without using forall (set-option :mbqi true) (declare-fun f (Int Int) Int) (declare-const a Int) (declare-const b Int) (assert (forall ((x Int)) (>= (f x x) (+ x a)))) I can write like this: (declare-const x Int) (assert (>= (f x x) (+ x a)))) with Z3 will explore all the possible values of type Int in this two cases. So what's the difference? Can I really use the declare-const to eliminate the forall quantifier?

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• KEY_ENTER vs '\n'?

  - by wrongusername

  When I'm using PDcurses and I try to have a while loop exit when the enter key is pressed with while(key != KEY_ENTER), the while loop never exits. However, when I try to have the same loop exit with while((char)key != '\n'), it exits successfully whenever I pressed enter. What's the difference?

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• Are column families within a single keyspace related in any way?

  - by taw

  What's the difference between having keyspace Foo and column families A and B in it vs. having two keyspaces FooA and FooB with one column family in each? API make it look as if these two were pretty much equivalent. As a bonus question, how do supercolumns fit into this picture?

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• Ctrl-Backspace Visual Studio 2010

  - by Chris Watts

  I recently upgraded to Visual Studio 2010 and found out that when i press Ctrl-Backspace on a empty line it will delete the line, which is what it did in 2008, but then it will also delete the last character on the line above. I have tried to see if there is any settings anywhere but i cant seem to find any. Does anyone know if you can change this or did they make it default in 2010 Im using C#, if that makes a difference.

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• System call Vs Function call

  - by Ankur

  What is the difference between system call and function call. Is fopen a system call or function call.

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• What is the need of collection framework in java?

  - by JavaUser

  Hi, What is the need of Collection framework in Java since all the data operations(sorting/adding/deleting) are possible with Arrays and moreover array is suitable for memory consumption and performance is also better compared with Collections. Can anyone point me a real time data oriented example which shows the difference in both(array/Collections) of these implementations. Thx

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• Base class pointer vs inherited class pointer?

  - by Goose Bumper

  Suppose I have a class Dog that inherits from a class Animal. What is the difference between these two lines of code? Animal *a = new Dog(); Dog *d = new Dog(); In one, the pointer is for the base class, and in the other, the pointer is for the derived class. But when would this distinction become important? For polymorphism, either one would work exactly the same, right?

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• LINQ entity query performance

  - by Abdel Olakara

  Hi all, I have a silly question. I would like to know if there is performance deference in these two quries: var cObject = from cust in entities.Customer where cust.id == cid select cust; and var cObject = entities.Customer.First( c=> c.id == cid); My query return only one record as I am querying with the primary key. But do they make any difference?

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• Add and Subtract 128 Bit Integers in C(++)

  - by Billy ONeal

  Hello :) I'm writing a compressor for a long stream of 128 bit numbers. I would like to store the numbers as differences -- storing only the difference between the numbers rather than the numbers themselves because I can pack the differences in fewer bytes because they are smaller. However, for compression then I need to subtract these 128 bit values, and for decompression I need to add these values. Maximum integer size for my compiler is 64 bits wide. Anyone have any ideas for doing this efficiently? Billy3

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• Java and C++ on Stack Unwinding issue

  - by sahs-i-muhterem

  As far as I know, in case of an uncaught exception, C++ destroys the local variables immediately, Java releases the references and leaves the rest for the garbage collector. Is this right? What exactly is the difference between Java and C++ on this issue? in other words, which of these two languages is considered better in terms of stack unwinding issue? :)

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• Mainframe : JCL DISP parameters

  - by Manasi

  Hi, I would like to know the difference between KEEP and UNCATLG. As per my knowledge both will remove the catalog entry for the datasets. Thanks and Regards,Manasi

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• MS SQL Server BEGIN/END vs BEGIN TRANS/COMMIT/ROLLBACK

  - by Rich

  I have been trying to find info on the web about the differences between these statements, and it seems to me they are identical but I can't find confirmation of that or any kind of comparison between the two. What is the difference between doing this: BEGIN -- Some update, insert, set statements END and doing this BEGIN TRANS -- Some update, insert, set statements COMMIT TRANS ? Note that there is only the need to rollback in the case of some exception or timeout or other general failure, there would not be a conditional reason to rollback.

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• differences between procedure and function and routine?

  - by Yang

  in mysql database context, what is the difference among these 3 terms? stored procedure,stored routine,stored function. p.s. build-in functions like those date time functions, (weekday()) are considered as what? thanks in advance!

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• Cross-Domain iframe communication

  - by Chris

  I have an iframe being created on a page, and the page's domain is being explicitly set to 'xyz.com' but the iframe's domain is defaulting to 'dev.xyz.com', which is the actual domain i'm developing for. The problem is, when I try to access that iframe via iframe.contentWindow.document, it fails due to the difference in domain. I've tried setting the iframe's src to a file with document.domain = 'xyz.com' but that doesn't seem to be doing the trick... Any ideas?

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• Android Notification Bar Number

  - by JonF

  I've been able to successfully display the notification number count on the Android emulator. However, it doesn't display anything when I use it on an actual Android phone. Any suggestions on why there might be a difference?

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• Const unsigned char* to char8

  - by BSchlinker

  So, I have two types at the moment: const unsigned char* unencrypted_data_char; string unencrypted_data; I'm attempting to perform a simple conversion of data from one to the other (string - const unsigned char*) As a result, I have the following: strcpy((unencrypted_data_char),(unencrypted_data.c_str())); However, I'm receiving the error: error C2664: 'strcpy' : cannot convert parameter 1 from 'const unsigned char *' to 'char *' Any advise? I thought using reinterpret_cast would help, but it doesn't seem to make a difference.

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• C pointer to array/array of pointers disambiguation

  - by Richard J. Terrell

  What is the difference between the following declarations: int* arr1[8]; int (*arr2)[8]; int *(arr3[8]); What is the general rule for understanding more complex declarations?

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• SSL certificate performance issue

  - by sparagi

  There are some cheaper SSL certificates out there. Would a certificate from Verisign perform better/faster than a certificate from a discount provider? My gut is telling me that it does not make a difference b/c ultimately the certificate is installed on the server.

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• LINQ Query vs Lambda Expression

  - by FosterZ

  What is the difference between the following two snippets (i.e LINQ Query vs Lambda Expression) LINQ Query public Product GetProduct(int productID) { AdventureWorksDBDataContext db = new AdventureWorksDBDataContext(); Product product = (from p in db.Products where p.ProductID == productID select p).Single(); return product; } Using a Lambda expression public Product GetProduct(int productID) { AdventureWorksDBDataContext db = new AdventureWorksDBDataContext(); Product product = db.Products.Single(p = p.ProductID == productID); return product; }

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• Percentage value with GNU Diff

  - by cdated

  What is a good method for using diff to show a percentage difference between two files? Such as if a file has 100 lines and a copy has 15 lines that have been changed the diff-percent would be 15%.

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