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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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• ruby number to human-readable string conversion

  - by yaya3

  I need to have a list with id's for each list item being #one, #two etc. Is this the most efficient way or am I missing an in built ruby function here? -num_array = ["one", "two", "three", "four", "five", "six", "seven"] -navigation[:primary_level].each_with_index do |primary_item, idx| %li{ :id => "#{num_array[idx]}"}

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• How to create a complete binary tree of height 'h' using Python?

  - by Jack

  Here is the node structure class Node: def __init__(self, data): # initializes the data members self.left = None self.right = None self.parent = None self.data = data complete binary tree Definition: A binary tree in which every level, except possibly the deepest, is completely filled. At depth n, the height of the tree, all nodes must be as far left as possible. -- http://www.itl.nist.gov/div897/sqg/dads/HTML/completeBinaryTree.html I am looking for an efficient algorithm.

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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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• Bing image search like endless scroll in Flex

  - by Tee

  Hi, I want to know if there is any existing implementation of 'endless scroll' in Flex ? I searched online but I could only find implementation in Javascript. What could be the pros/cons of having an 'endless scroll' component in Flex, which would be more efficient JS or Flex. Thanks

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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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• Given an array of arrays, how can I strip out the substring "GB" from each value?

  - by stormist

  Each item in my array is an array of about 5 values.. Some of them are numerical ending in "GB".. I need the same array but with "GB" stripped out so that just the number remains. So I need to iterate through my whole array, on each subarray take each value and strip the string "GB" from it and create a new array from the output. Can anyone recommend and efficient method of doing this?

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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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• 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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• Improving performance of cluster index GUID primary key

  - by TheVillageIdiot

  Hi, I've a table with large number of rows (10K+) and it primary key is GUID. The primary key is clustered. The query performance is quite low on this table. Please provide suggestions to make it efficient.

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