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• If I create a transient property in the model, isn't this managed by core data then?

  - by mystify

  Just to grok this: If I had a transient property, lets say averagePrice, and I mark that as "transient" in the data modeler: This will not be persistet, and no column will be created in SQLite for that? And: If I make my own NSManagedObject subclass with an averagePrice property, does it make any sense to model that property in the xcdatamodel file? Would it make a difference if I would simply create a property in my subclass and not model that in the entity? (I think: yes, it doesn't matter at all ... but not sure)

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• How to write binary data to a usb flash drive or floppy?

  - by Alon

  Hi I need to write my own binary raw data to a flash drive (like a disk on key) or a floppy using C#. The result will be my custom file system from my program. Any ideas? Thank you.

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• Can anybody give me a complete list of data structure supported in Java(not in util package)?

  - by Kavin

  I want to know what kinds of data structure in Java and not in the util package? For example: Hashmap, Collection, Set. Please give me a list of them as many as possible. Thank you

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• Good test database on Windows to play around with data retrieval operations in SQL?

  - by ovr

  I need a test database to practice joins and other kinds of data retrieval operations in SQL. What's a good free test database and RDBMS system to use on Windows?

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• ASP.NET Dynamic Data field value disappears in the browser.

  - by ProfK

  I have an ASP.NET Dynamic Data web application, with an entity called ActivationResource. One of the properties of this is a CellPhone field. Now, whenever I open a List or Details view of one of these entities, the cell phone number displays for a moment then disappears. Anyone have any ideas as to the cause of this mysterious behavior?

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• Excel macro to change external data query connections - e.g. point from one database to another

  - by Rory

  I'm looking for a macro/vbs to update all the external data query connections to point at a different server or database. This is a pain to do manually and in versions of Excel before 2007 it sometimes seems impossible to do manually. Anyone have a sample? I see there are different types of connections 'OLEDB' and 'ODBC', so I guess I need to deal with different formats of connection strings?

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• Which data structures and algorithms book should I buy?

  - by Hei

  I know C and C++ and I have some experience with Java, but I don't know too much about Algorithms and Data Structures. I did a search on Amazon, but I don't know what book should I choose. I don't want a book which put its basis only on the theoretic part; I want the practical part too (probably more than the theoretical one :) ). I don't want the code to be implemented in a certain language, but if is in Java, probably I would happier. :)

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• Learning SQL & Microsoft Data Services stack - Where to start?

  - by Jim

  I'm trying to learn the Microsoft data / service stack. I want to build a database in SQL Azure and expose it to a c# client application. I've never worked with any SQL database technology. Looking online, everything just seems so confusing -- too many technologies, hard to tell what's new vs what's old. What's the latest technologies to look at, and what (books?) should I be reading?

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• R question. Using lappy on a data.frame and creating new variables w/ output.

  - by Michael

  Hello, I have 13 quantitative variables in a data.frame (called 'UNCA'). The variables are named q01_a, q01_b, ...q01_m. I want to create 13 new variables that have the same values but are coded as a factor. I would like to name these 13 new variables q01_a.F, q01_b.F, ...q01_m.F. Any help would be greatly appreciated!

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• iPhone - is there any way to look at the core data store for a live app?

  - by jtrim

  I've got a live app on the app store that's producing some strange results when the user upgrades versions that I can't reproduce in my dev environment. Does anyone know of a way to inspect the core data store of a live iPhone app?

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• Are there free, low cost, or open source tools for matching name/address data?

  - by luiscolorado

  This question is related to Tools for matching name/address data. There is a number commercial tools provided by SAS, Oracle, Microsoft, etc., that allow to de-duplicate or merging names of individuals or companies coming from multiple sources. However, after reading the answers to the question mentioned before, I wondered why a seemingly interesting problem didn't receive any answers mentioning open source projects that could tackle the problem. Are you aware of any open source projects or algorithms to implement the so called "record linking", "record merging", or "clustering"?

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• Which is the best data-warehousing tool to learn in the present market?

  - by uma

  I am graduating soon in electrical engineering. I would like to learn a data-warehousing tool. Which of the following would you suggest I learn to help me advance my career, bearing in mind I don't have a computer science degree? business objects; informatica; hyperion; datastage cognos

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• What is the most popular generic collection data structure library for C?

  - by Tom Dalling

  I'm looking for a C library that provides generic collection data structures such as lists, associative arrays, sets, etc. The library should be stable and well tested. I'm basically looking for something better than the crappy C standard library. What C libraries fit this description? EDIT: I'd prefer that the library was cross-platform, but failing that, anything that works on Mac/Linux.

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• Can I do an ASP.NET Dynamic Data project against a Sybase database?

  - by theog

  Or must it be a SQL Server database? If I'm reading the documentation right, as long as I use Entity Framework and not Linq to SQL, I can go against a Sybase data source. But I'm not certain...

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• Storing and Retrieving Images from Database using Python

  - by tamizh_geek

  Hi, I want to store the images related to a each person's profile in the DB and retrieve them when requested and save it as .jpg file - and display it to the users. How could I render the image data stored in the DB as an image and store it locally??

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• How to treat RAM data as if it was a real file?

  - by Ole Jak

  So I have some temp data in my prorram (in RAM) I want to somehow make it seem as it is file (for example for sending it into another program which takes a file link as argument)? Is it possible? How to do such thing?

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• What is the best data-structure for storing elements which will be retrieved only once and then dele

  - by Jay

  I want to design a data-structure for storing elements, which will be retrieved only once after insertion and will be deleted after that. I can't use a stack or queue as the order of retrieval is not guaranteed. [EDIT] - I would like to use contigous memory (I would prefer to avoid doing malloc every now and then) and also I would prefer searchability also.

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• How do I get the application data path in Windows using C++?

  - by Brian T Hannan

  I looked all over the internet and there doesn't seem to be a decent solution that I could find. I want to be able to programmatically in C++ obtain the path "%ALLUSERSPROFILE%\Application Data" that explorer can translate into a real path. Can I do this without relying on third-party code?

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• SQL: how to get all the distinct characters in a column, across all rows

  - by frankadelic

  Is there an elegant way in SQL Server to find all the distinct characters in a single varchar(50) column, across all rows? Bonus points if it can be done without cursors :) For example, say my data contains 3 rows: productname ----------- product1 widget2 nicknack3 The distinct inventory of characters would be "productwigenka123"

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• How can we send a large size of data (>2038 char) from client to Server using ajax?

  - by Dilip

  How can we send a large size of data (2038 char) from client to Server using ajax? I like to send an array of key-pair values of size more than 10KB. I am currently using cookies, is there any other prefered way by which we can send it through an Ajax Call.

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• In a CPU all the memory Signals and DATA go through the memoryController, right?

  - by ~konman

  for example: When the MEM CTRLER wants a instruction register to be populated with the DATA which the next ADDR REGISTER points to. Does it send a signal to the ADDR REGISTER to place the next ADDR on the ADDR bus or does the ADDR go to the MEM CTRLER and is placed on the BUS by the MEM CTRLER?

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• Heap as memory store same as data structure heap?

  - by Tony

  Is the heap one uses as a data structure (complete binary tree) in Computer Science the same type of heap used in memory where objects are allocated?

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• How can I save large amounts of data in C#?

  - by Adam

  I'm writing a program in C# that will save lots of data points and then later make a graph. What is the best way to save these points? Can I just use a really long array or should I use a text file or excel file or something like that?

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• How do you process a large data file with size such as 10G?

  - by numvmems

  I found this open question online. How do you process a large data file with size such as 10G? This should be an interview question. Is there a systematic way to answer this type of question?

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• Any other way to import data files(like .csv) in python sqlite3 module ?[not insert one by one]

  - by cyaos

  in sqlite3's client CLI, there is " .import file TABLE_name " to do it. But, I do not want to install sqlite3 to my server at present. in python sqlite3 module, we can creat and edit a DB. But, I have not found a way to import data-file to a TABLE, except inserting rows one by one. any other way? Thanks.

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