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  • In ruby on rails, is it possible to do a sum query with group by using the find_each batching?

    - by BarryOg
    I'm loading data from my database and I'm doing a sum calculation with a group by. ElectricityReading.sum(:electricity_value, :group => "electricity_timestamp", :having => ["electricity_timestamp = '2010-02-14 23:30:00'"]) My data sets are extremely large, 100k upwards so I was wondering if its possible to use the find_each to batch this to help with memory overhead. I can write the batching manually use limit and offset I guess but I'd like to avoid that if the code already exists.

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  • finding if an anniversary is coming up in n days in MySql

    - by user151841
    I have a table with anniversary dates. I want a query that returns me rows of anniversaries coming up in the next 10 days. For instance: birthdate --------- 1965-10-10 1982-05-25 SELECT birthdate FROM Anniversaries WHERE mystical_magical_mumbo_jumbo <= 10 +------------+ | birthdate | +------------+ | 1982-05-25 | +------------+ 1 row in set (0.01 sec) I'd like to keep the query in the form x <= 10, because I'll use that number 10 in other parts of the query, and if I set it to a variable, I can change it once everywhere by changing the variable, and not have to re-write the query.

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  • In Regex how to match in between the words?

    - by user828234
    I want to write the regex pattern which should match the string in between also. For example: I have writtenthe regex pattern like this ^((?!mystring).)*$ Which means match words which doesnot contain mystring. But i want regex pattern to match like this. mystringabcdfrevrgf regex matcher should return abcdfrevrgf How will i achieve this, Please help Thanks in advance. Answer: ((?!mystring)(.*))$

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  • What is the difference between these two statements (asp.net/c#/entity framework)

    - by user318573
    IEnumerable<Department> myQuery = (from D in myContext.Departments orderby D.DeptName select D); var myQuery = (from D in myContext.Departments orderby D.DeptName select D); What is the difference between these two statements above? In my little asp.net/C#/ EF4.0 app I can write them either way, and as far as how I want to use them, they both work, but there has to be a reason why I would choose one over the other?

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  • g++, R_X86_64_32S : what is it ?

    - by Skypers
    Hello. I write a 3D engine in C++ with OpenGL. I usually work on this project on my archlinux 64 bits, but on theese holidays I do on a 32 bits system. I use subversion, and since the last svn up on my 64 bits system, I've got errors : http://pastebin.be/23730 core, wrapper and interface are compilet using the -fPIC option, I do not understand so ... Thanks :)

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  • Code:Block in window & compiler in linux

    - by ambika
    i have the Code:Block ide in window. my compiler is in linux machine that is GCC. can i write the code in window & compile in linux with the Code:Block ide. if i can , then how ? if not, is there any alternative to do that. thanks in advance for all suggestion.

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  • .NET regular expression

    - by vert
    How would I write a regular expression (C#) which will check a given string to see if any of its characters are characters OTHER than the following: a-z A-Z Æ æ Å å Ø ø - '

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  • Writing an ostream filter?

    - by shoosh
    I'd like to write a simple ostream which wraps an argument ostream and changes the stream in some way before passing it on to the argument stream. The transformation is something simple like changing a letter or erasing a word What would a simple class inheriting from ostream look like? What methods should I override?

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  • ImmutableDictionary has no constructors defined

    - by lukasLansky
    So, I would like to write something like this: var d = new ImmutableDictionary<string, int> { { "a", 1 }, { "b", 2 } }; (using ImmutableDictionary from System.Collections.Immutable). It seems like a straightforward usage as I am declaring all the values upfront -- no mutation there. But this gives me error: The type 'System.Collections.Immutable.ImmutableDictionary<TKey,TValue>' has no constructors defined How I am supposed to create a new immutable dictionary with static content?

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  • Initializr Bootstrap. Knowledgebase. How to create and edit content?

    - by Idle Mind
    I am in the process of creating a knowledgebase website for my office and I find bootstrap pretty awesome. Now, people at work, which may not be HTML savvy, will be creating new articles and then posting them to this knowledge base. Is there something you can recommend that would allow such type of user to create a document on somthing similar to Microsoft Word but web based and then publish? Or do I have to write it from scratch? Thanks for any help.

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  • Autohotkey to map F5 to Shift+Home and then F5 - eventually executing a single line query in sql server?

    - by puretechy
    Reading the syntax from autohotkey, I am trying to achieve this. But the first step of selecting the entire line is not working:- F5:: send {Shift Home} return I have tried few others too, but its not working. This is not sending Shift+Home combination on pressing F5 key. Please tell me what's wrong with this? Also if possible, what to do next?, as if I will write send {F5} I believe, it will recursively fire this script again and again..

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  • Is it faster to compute values in a query, call a Scalar Function (decimal(28,2) datatype) 4 times,

    - by Pulsehead
    I have a handful of queries I need to write in SQL Server 2005. Each Query will be calculating 4 unit cost values based on a handful of (up to 11) fields. Any time I want 1 of these 4 unit cost values, I'll want all 4. Which is quicker? Computing in the SQL Query ((a+b+c+d+e+f+g+h+i)/(j+k)), calling ComputeScalarUnitCost(datapoint.ID) 4 times, or joining to ComputeUnitCostTable(datapoint.ID) one time?

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  • string concatenation in Groovy seems unconvenient

    - by Zombies
    My goal is to write this: println "this should be 3: ($1+2)" //this is invalid groovy, it won't run Yet this is valid in ruby. Is there a way I can put statements that will eval inside a string or must I use complete variables names? I am basically looking for the Ruby equivalent of: puts "this shoud be 3: #{1+2}" #this is valid ruby

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  • Compare two table and find matching columns

    - by Karthick
    Hi, I have two tables table1 and table2, i need to write a select query which will list me the columns that exist in both the tables.(mysql) I need to do for different tables (2 at a time) Is this possible? I tried using INFORMATION_SCHEMA.COLUMNS but am not able to get it right.

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  • Audible Audio (.aa) file spec?

    - by Adam
    Does anyone know of a good resource on the Audible Audio (.aa) file spec? I'm trying to write a program that can use them, if no one knows of a resource, any tips on reverse engineering the spec my self? I opened it up in a Hex editor and poked around, looks like an MP3 but with a ton more header info.

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  • ORACLE:- 'SELECT ODER BY ASC' but 'USA' always first.

    - by Robert
    I have to write a drop down query for countries. But USA hould always be first. The rest of the countries are in alphabetical order I tried the following query SELECT countries_id ,countries_name FROM get_countries WHERE countries_id = 138 UNION SELECT countries_id ,countries_name FROM get_countries WHERE countries_id != 138 ORDER BY 2 ASC

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