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• Insert statement with where clause.

  - by debraj

  I had a table with unique Date_t1 date type field, but in Table description field is not mentioned as unique, now while inserting new row i need to validate if date exist or not, If already exist i should not allow to make changes on that row, neither a new row needs to be created, Any idea how to resolve this problem in efficient way,

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• Mesh simplification

  - by Amrita

  I wish to develop a softare for 3D object compression (by polygon reduction) in flex using papervision 3D. Could you please suggest me an efficient algorithm for the same?

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• Java - Collections.sort() performance

  - by msr

  Hello, Im using Collections.sort() to sort a LinkedList whose elements implements Comparable interface, so they are sorted in a natural order. In the javadoc documentation its said this method uses mergesort algorithm wich has n*log(n) performance. My question is if there is a more efficient algorithm to sort my LinkedList? The size of that list could be very high and sort will be also very frequent. Thanks!

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• What is mangling tinyurls?

  - by djn

  Hello all. I've noticed that some form processors make a mess out of posted TinyURLs (converting the thing to a broken 'tinyurl": "http:\/?\/?tinyurl.com\/?whatever", "ok": tr') while leaving alone other plain URLs. I've seen it happen in WordPress, and I've seen it here on SO (eg.: http://stackoverflow.com/questions/2508690/whats-the-most-efficient-way-to-setup-a-multi-lingual-website - second comment to first answer). Has anybody looked into what component or function is doing this? Is there a way to prevent it?

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• mean and variance of image in single pass

  - by ajith

  hi everyone,am trying to calculate mean and variance using 3X3 window over image(hXw) in opencv...here is my code...is there any accuracy issues with this??or is there any other efficient method to do it in one pass.? int pi,a,b; for(i=1;i

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• How to remove duplicates from a StringCollection in c#?

  - by Taz

  How to remove duplicates from a StringCollection in c#? I was looking for a more efficient approach. StringCollection is returned from an API.

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• What's the best way to sort results of a given query by fixed column values ?

  - by eugene y

  Example: SELECT id, name FROM user WHERE id IN (1,2,3,4,5) ORDER BY FIELD(id, 2, 3, 4, 1, 5) I've seen some examples using FIND_IN_SET() or FIELD() functions. Which one is better? Are there any more efficient approaches? Order is supposed to change rarely.

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• Best way to code this, string to map conversion in Groovy

  - by Daxon

  I have a string like def data = "session=234567893egshdjchasd&userId=12345673456&timeOut=1800000" I want to convert it to a map ["session", 234567893egshdjchasd] ["userId", 12345673456] ["timeout", 1800000] This is the current way I am doing it, def map = [:] data.splitEachLine("&"){ it.each{ x -> def object = x.split("=") map.put(object[0], object[1]) } } It works, but is there a more efficient way?

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• Scale a .jpg file in WPF

  - by James Cadd

  I'd like to open a .jpg file in WPF, scale it down to around 50%, then save it back to the file system. What's a good/efficient way to go about doing that?

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• ESS workflow for R project/package development

  - by ahala

  Can anyone share his experience on workflow for R peject development under ESS? I tried several times to learn emacs but I have not get it yet. I can understand ESS as an editor, but is there a project view in ESS? what's the efficient ways to set up/view R project directory, coding, and testing? Thanks for any advices.

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• Java efficent strategy to access a DB

  - by user279481

  A simple question: what is the more efficient way to access a db in Java/JDBC? I'm a web developper and I'd like to write some reusable and scalable code. What can you suggest?

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• Duplicating an array of strings.

  - by Jon

  arr = ["red","green","yellow"] arr2 = arr.clone arr2[0].replace("blue") puts arr.inspect puts arr2.inspect produces: ["blue", "green", "yellow"] ["blue", "green", "yellow"] Is there anyway to do a deep copy of an array of strings, other than using Marshal as i understand that is a hack. I could do: arr2 = [] arr.each do |e| arr2 << e.clone end but it doesn't seem very elegant, or efficient. Thanks

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• Fastest way to reverse an array?

  - by mystify

  I have an table view, and the data source returns elements in the wrong order. So I have to reverse the elements in that array which returns the data for each row. How would I do that the most efficient way?

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• Best language for scripting large scale file management

  - by Dan

  The National Park Service's Natural Sounds Program collects multiple terabytes of data each year measuring soundscapes. In your opinion, what is best available scripting language to manage massive amounts of files and file types? We would like to easily design and run efficient user-friendly scripts to search for and retrieve/create copies of files that may be located in different directories according a single static hierarchy. The OS will most likely be windows. Thanks!

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• How to find attribute value

  - by Pramodh

  Hi, I need to find an inner text of an element inside an XmlDocument and return it's Xpath. for example, searching for "ThisText" inside : <xml> <xml2 val="ThisText"></xml2> </xml> should return the Xpath of xml2 what's the most efficient way of doing this in c#?

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• Why is "#{String}" a common idiom in Ruby

  - by Tetsujin no Oni

  A Ruby dev I know asked this; my answer is below... Are there other, better reasons? Why do so many Ruby programmers do "{string}" rather than string since the second form is simpler and more efficient?

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• MySQL Select statement Where table1.id != table2.id

  - by Michael

  I have a table of data which has posts, then I have a separate table of data which has deleted posts. What happens when a post is deleted is that it's ID get's added to the deleted table rather than removing the post entry. What is a clean efficient way of selecting all the posts from the posts table without selecting the ones that have their ID in the deleted table

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• Jquery selector question

  - by fizzer

  Hi, I have a working selector but I just wondered whether there was another way I could write it. Here's the html structure: THIS IS TEXT I WANT TO SELECT item 1 item 2 item 3 I have a click event attached to the nested listitems. In the click event I am trying to select the anchor tag. I have used the follwing selector: $(this).parents('li').children('a') Is this the most efficient way of selecting the anchor tag?

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• What is the most elegant way to find index of duplicate items in C# List

  - by user326559

  I've got a List that contains duplicates and I need to find the indexes of each. What is the most elegant, efficient way other than looping through all the items. I'm on .NET 4.0 so LINQ is an option. I've done tons of searching and connect find anything. Sample data: var data = new List{"fname", "lname", "home", "home", "company"}(); I need to get the indexes of "home".

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• How to iterate all query paths within an image header namespace in WIC?

  - by muruge

  Hello All, I am using Windows Imaging Component to read/write image metadata in my WPF application. I would like to know if there is an efficient way to know if any paths exist within a namespace. For instance I would like to know if any paths within IPTC namespace exist and if not I want to delete the namespace from the image header. Any pointers would be greatly appreciated. Thanks, Murugesh.

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• java background task

  - by markovuksanovic

  I was wondering which would be the most efficient approach to implement some kind of background task in java (I guess that would be some kind of nonblocking Threads). To be more precise - I have some java code and then at some point I need to execute a long running operation. What I would like to do is to execute that operation in the background so that the rest of the program can continue executing and when that task is completed just update some specific object which. This change would be then detected by other components.

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• Take the intersection of an arbitrary number of lists in python

  - by thepandaatemyface

  Suppose I have a list of lists of elements which are all the same (i'll use ints in this example) [range(100)[::4], range(100)[::3], range(100)[::2], range(100)[::1]] What would be a nice and/or efficient way to take the intersection of these lists (so you would get every element that is in each of the lists)? For the example that would be: [0, 12, 24, 36, 48, 60, 72, 84, 96]

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• Select stats from different days

  - by Michael

  What is the most efficient way to do this? Right now I am doing it this way.. then print $counttoday; print $countyesterday; I know there has to be a better way to do this. Let me know, thanks!

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• Multiple select statement in stored procedure

  - by GigaPr

  Hi, i have a stored procedure that has to retrieve data from multiple tables something like SELECT [AppointmentId] ,[ContactId] ,[Date] ,[BookedBy] ,[Details] ,[Status] ,[Time] ,[Type] ,[JobId] ,[AppointmentFor] ,(Select PersonFirstName from Person where Person_Id = [AppointmentFor]) As UserFirstName ,(Select PersonLastName from Person where Person_Id = [AppointmentFor]) As UserLastName ,(Select PersonFirstName from Person where Person_Id = [ContactId]) As ContactFirstName ,(Select PersonLastName from Person where Person_Id = [ContactId]) As ContactLastName FROM [dbo].[Appointments] my question is there is any other more efficient way to do this? Or is this the right approach? I am working on a Sql server 2008 Thanks

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• mySQL - One large query vs Ajax indivdual queries

  - by Mark

  Hi guys, I guess no one will have a definative answer to this but considered predictions would be appriciated. I am in the process of developing a mySQL database for a web application and my question is: Is it more efficient to make a single query that returns a single row using AJAX or To request 100 - 700 rows when the user will likely only ever use the results of two or three? Really I am asking what is heavier for the server 2-3 requests with one result or 1 request with 100 - 700 results? Thanks, Mark

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