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  • Fill in missing values in a SELECT statement

    - by benjamin button
    If i have a table with two fields.customer id and order. let's say i have in total order ID 1,2,3,4 all the customer can have all the four orders.like below 1234 1 1234 2 1234 3 1234 4 3245 3 3245 4 5436 2 5436 4 you can see above that 3245 customer doesnt have order id 1 and 2. how could i print in the query…

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  • class which cannot be derived

    - by benjamin button
    I found this code here class Usable; class Usable_lock { friend class Usable; private: Usable_lock() {} Usable_lock(const Usable_lock&) {} }; class Usable : public virtual Usable_lock { // ... public: Usable(); Usable(char*); // ... }; Usable a; class DD : public Usable { }; DD dd; // error: DD::DD() cannot…

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  • Are L'A' and 'A' totally same?

    - by Benjamin
    When we write a program which supports both unicode and multibytes, we often use _T("some string") macro for strings. But, does a character also need to wrap this macro? Are L'A' and 'A' totally same? Don't we need to use _T('A') for a character?

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  • What does an object file contain

    - by benjamin button
    HI everyone, during the various stages of compilation in C or C++, i know that an object file gets generated. i.e., any_name.o file. what does thos .o file contain actually. i cant open it since its a binary file. Could anybody please help me? are the contents of the object file mainly Dependant on the compiler which we use on unix?

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  • How are $LOAD_PATH and $: different?

    - by Benjamin Oakes
    I needed to know what was in my Ruby load path, so I did this: $ ruby -e "puts $LOAD_PATH" It didn't print anything out, which I didn't expect. So I tried this: $ ruby -e "puts $:" /usr/local/lib/site_ruby/1.8 /usr/local/lib/site_ruby/1.8/i486-linux /usr/local/lib/site_ruby/1.8/i386-linux /usr/local/lib/site_ruby…

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  • C++ interview question

    - by benjamin button
    as i am not an expert in c++,i was not aware of the answer to this question asked in one of the interviews. lets say there is a base class pointer which is pointing to a base class object: baseclass *bptr; bptr= new baseclass; now if i do bptr= new derived; what is the problem here?

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  • How do I call Matlab in a script on Windows?

    - by Benjamin Oakes
    I'm working on a project that uses several languages: SQL for querying a database Perl/Ruby for quick-and-dirty processing of the data from the database and some other bookkeeping Matlab for matrix-oriented computations Various statistics languages (SAS/R/SPSS) for processing the Matlab output Each language fits…

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  • what is size_t in C

    - by benjamin button
    Hi, i am getting confused with size_t in C. i know that it is returned by a sizeof operator. But what exactly it is?Is it a datatype? let's say i have a for loop int i; or size_t i;//which one should i use? for(i=0;i<some_size;i++)

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  • Sql joining a table

    - by benjamin button
    I have a question regarding the Sql Joins. whenever we join two different tables on some fields. what will happen exactly inside oracle which will result in the query output. will there be a temporary table created just for presenting the query output.

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  • freeing a memory twice

    - by benjamin button
    Hi, AFAIAK, freeing a NULL will result in nothing.i mean nothing is being done by the compiler/no functionality is performed. Still i do see some statements where people say that one of the scenario,where a memory corruption can occur is "freeing a memory twice"? Is this still true?

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  • Login and register page PHP

    - by Ben
    How do I make a log in (as one document) and register (as another document) page for my site using PHPMyAdmin? So that people can register and log into my site. Thanks! Benjamin

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  • Membership levels PHP

    - by Ben
    I want to make someone able to register on my site (or upgrade their current account) with one of 3 membership levels. When someone selects the membership level (or upgrades their current account) and registers, they will register under that membership level and payment will be started from there. …

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  • Nashorn, the rhino in the room

    - by costlow
    Nashorn is a new runtime within JDK 8 that allows developers to run code written in JavaScript and call back and forth with Java. One advantage to the Nashorn scripting engine is that is allows for quick prototyping of functionality or basic shell scripts that use Java libraries. The previous…

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  • Openbsd init script for ssh VPN tunnel

    - by manthis
    I have a server hosting SSH tunnels and Openbsd 4.5 clients connecting to it. Things work just fine but I am in the need of automating the connection from the client to the server. So that if the client is accidentally rebooted, then the connection initiates unattended. So it should…

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  • rewrite URL for PUT request

    - by benjisail
    Hi, I changed the way my URL are working on my server. It is now www.myserver.com/service instead of www.myserver.com/test/service I have added a RedirectMatch 301 to my Apache conf file to redirect any access to www.myserver.com/test to www.myserver.com/. I am receiving file to…

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