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  • SQL concatenate rows query

    - by bobobobo
    Say we have a table table posts +---------+-----------+--------------------------------+ | postId | title | status | bodyText | +---------+-----------+--------------------------------+ | 1 | Hello! | deleted | A deleted post! | | 2 | Hello 2! | deleted | Another one! | Can we, in SQL, retrieve a concatenation of a field across rows, by issuing a single query, not having to do the join up in a loop in our back-end code? Something like select title from posts group by status ; Should give "Hello!, Hello 2!"

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  • update multiple rows in oracle

    - by devang
    hi can you tell me how to update multiple rows in oracle as when i fired the update statment it gave me the following error ORA-01427: single-row subquery returns more than one row Thanks in advance

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  • New "How do I ..." series

    - by Maria Colgan
    Over the last year or so the Optimizer development team has presented at a number of conferences and we got a lot of questions that start with "How do I ...". Where people were looking for a specific command or set of steps to fix a problem they had encountered. So we thought it would be a good idea to create a series of small posts that deal with these "How do I" question directly. We will use a simple example each time, that shows exactly what commands and procedures should be used to address a given problem. If you have an interesting "How do I .." question you would like to see us answer on the blog please email me and we will do our best to answer them! Watch out for the first post in this series which addresses the problem of "How do I deal with a third party application that has embedded hints that result in a sub-optimal execution plan in my environment?"

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  • Context switches much slower in new linux kernels

    - by Michael Goldshteyn
    We are looking to upgrade the OS on our servers from Ubuntu 10.04 LTS to Ubuntu 12.04 LTS. Unfortunately, it seems that the latency to run a thread that has become runnable has significantly increased from the 2.6 kernel to the 3.2 kernel. In fact the latency numbers we are getting are hard to believe. Let me be more specific about the test. We have a program that has two threads. The first thread gets the current time (in ticks using RDTSC) and then signals a condition variable once a second. The second thread waits on the condition variable and wakes up when it is signaled. It then gets the current time (in ticks using RDTSC). The difference between the time in the second thread and the time in the first thread is computed and displayed on the console. After this the second thread waits on the condition variable once more. So, we get a thread to thread signaling latency measurement once a second as a result. In linux 2.6.32, this latency is somewhere on the order of 2.8-3.5 us, which is reasonable. In linux 3.2.0, this latency is somewhere on the order of 40-100 us. I have excluded any differences in hardware between the two host hosts. They run on identical hardware (dual socket X5687 {Westmere-EP} processors running at 3.6 GHz with hyperthreading, speedstep and all C states turned off). We are changing the affinity to run both threads on physical cores of the same socket (i.e., the first thread is run on Core 0 and the second thread is run on Core 1), so there is no bouncing of threads on cores or bouncing/communication between sockets. The only difference between the two hosts is that one is running Ubuntu 10.04 LTS with kernel 2.6.32-28 (the fast context switch box) and the other is running the latest Ubuntu 12.04 LTS with kernel 3.2.0-23 (the slow context switch box). Have there been any changes in the kernel that could account for this ridiculous slow down in how long it takes for a thread to be scheduled to run?

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  • Rails: creating a model in the new action

    - by Joseph Silvashy
    I have an interesting situation, well it's probably not that unique at all, but I'm not totally sure how to tackle it. I have a model, in this case a recipe and the user navigates to the new path /recipes/new however the situation is that I need to be able to have the user upload images and make associations to that model in the new action, but the model doesn't have an ID yet. So I assume I need to rethink my controller, but I don't want to have redirects and whatnot, how can accomplish this? Here is the basic controller, barebones obviously: ... def new # I should be creating the model first, so it has an ID @recipe = Recipe.new end def create @recipe = Recipe.new(params[:recipe]) if @recipe.save redirect_to @recipe else render 'new' end end ... update Perhaps I can have a column thats like state which could have values like new/incomplete/complete or what-have-you. I'm mostly trying to figure out what would also be most efficient for the DB. It would be nice if I could still have a url that said '/new', instead of it be the edit path with the id, for usability sake, but I'm not sure this can be simply accomplished in the new action of my controller. Thoughts?

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  • Connect to wifi ubuntu 14.04 (new ubuntu user)

    - by user289168
    I have recently changed my operating system from windows 8 to ubuntu 14.04, when trying to connect to the network via wifi the system just keeps asking for my password over and over without connecting. The connectivity through an Ethernet cable is perfectly fine however and my wifi worked fine through windows 8, I have very little ubuntu knowledge so i apologise if the right information is not shown in this question. Just wondering if there was any known problems or if anyone has seen this before? Thanks in advance for any help, Tom

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  • My Habitat For Humanity Day Before TechEd 2010 in New Orleans

    Yesterday, I spent the day building what I think are stantions (piles of blocks held together by mortar) to hold a house 5 feet above the ground.  Through twitter, I saw a bunch of people from... This site is a resource for asp.net web programming. It has examples by Peter Kellner of techniques for high performance programming...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • iPhone Apps - The New Business Website?

    That the alternatives of a website or an app are more similar than distinct, and can be seen in the adoption by large websites of iPhone apps. If your target market has elements of mobility, social media involvement and immediacy in decision making, then consider having an iPhone app in addition to and in support of your traditional website.

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  • Links don't work on new server

    - by Beko
    I've recently moved from server with php4 to php5. Now I cant open content in my page. Links look like this "page.com/news-it-is-rainy-day-1.html". But when I try to open link I just get the archive (news.html). I also use smarty template engine. My rewrite rule in .htacces looks like this: Options +FollowSymlinks RewriteEngine on RewriteRule ^news-(.*)\.html$ news.php?do=read&id=$1 RewriteRule ^news.html$ news.php RewriteRule ^index.html$ index.php AddType application/x-httpd-php .xml

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  • New release of Oracle Process Accelerators (11.1.1.6.2

    - by JuergenKress
    Press release delivers Industry-focused solutions including Incident Reporting (Public Sector) and Loan Origination (Financial Services). lSO updated Travel Request Management (TRM), Document Routing and Approval (DRA), and Internal Service Requests (ISR). All BPM material is available at our SOA Community Workspace (SOA Community membership required): Presentation | Data Sheet | White paper Download Process Accelerators and Collateral - OTN SOA & BPM Partner Community For regular information on Oracle SOA Suite become a member in the SOA & BPM Partner Community for registration please visit  www.oracle.com/goto/emea/soa (OPN account required) If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Mix Forum Technorati Tags: bpm,process accelerators,SOA Community,Oracle SOA,Oracle BPM,Community,OPN,Jürgen Kress

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  • JDBC ResultSet total rows

    - by Zeeshan
    I am implementing Paging in my application. For this i run a query and get a resultset. Now i want to get total no of records in this resultset for my paging calculation. How can i get ? i dont want to execute a extra sql which gives me total rows

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  • UITableView is getting interaction when changing rows with animation

    - by Tiago
    Hi, I have a tableview on a nib file with the interaction setting turned off. I'm animating a section change like this: [myTableView beginUpdates]; [myTableView deleteSections:[NSIndexSet indexSetWithIndex:0] withRowAnimation:YES]; [myTableView insertSections:[NSIndexSet indexSetWithIndex:0] withRowAnimation:YES]; [myTableView endUpdates]; The problem is that, when I do this, the rows become selectable. How do I keep the interaction disabled while keeping the animation?

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