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  • Why can't I SELECT a parent field that doesn't have a child?

    - by myaccount
    (rest_branches) is the table of restaurants. (phone_numbers) is another table which contains the restaurants phone_numbers, and it has a field called (branch_id) which references the restaurant id. When I try: SELECT * FROM rest_branches NATURAL JOIN phone_numbers I only get the restaurants which have a phone_number. What should I do to get all restaurants even if they don't have a phone number?

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  • Tag suggestion (not tag autocomplete)

    - by takeshin
    AJAX autocomplete is fairly simple to implement. However, I wonder how to handle smart tag suggestion like this on SO. To clarify the difference between autocomplete and suggestion: autocomplete: foo [foobar, foobaz] suggestion: foo [barfoo, foobar, foobaz], or even better, with 'did you mean' feature: [barfoo, foobar, foobaz, fobar, fobaz] I suppose I need some full text search in tags (all letters indexed, not just words). There would be no problem to do it witch regex or other patterns for limited number of tags (even client side). But how to implement this feature for big number of tags? Is there any particular reason (besides URL) the tags on SO are dash separated? What about Unicode characters in tags? I store the tags in the table with the following columns: id, tagname. My SQL query returns objects with following fields: id, tagname, count

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  • Latency on mobile networks (Android)

    - by Meep3D
    I am planning to give mobile phone development a shot and was thinking about making some simple multiplayer games. I know latency over local wifi is probably fine but what are the issues with latency over GPRS/3G? I've searched and the best I've seen is someone saying it was 'high', without presenting any concrete numbers. I suppose latency fluctuations are important as well - does anyone have any info on this?

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  • Programming mobile devices

    - by sax
    I love desktop and web programming, but I would like to be able to program some sort of small device I can then carry with me. Most mobile phones are quite hard to create programs for as they want you to buy the things they offer instead. What mobile-phone/gameboy size devices would be suitable for my goal?

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  • android communication between two applications

    - by androidTesting
    Hello, i need some help in how to start developing two android applications (on one phone) which communicate with each other. 1. Application A sends a string to application B 2. Application B receives the string for example "startClassOne", app B using a method starts classOne and gets the result. The result is send back (again as string!) to Application A. 3. Application A writes in console the received string from B.

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  • C# Net CF - how to take a picture without interaction?

    - by Jakis
    Hello everyone, Is there a possibility to take a picture using phone's camera without user interaction? I'd like to write a short app that only takes sequence of pictures and the user should be able to set number of pictures, location, quality and time between shots. After starting the app should take pictures without further interaction. This program should for examlple take a sequence of 250 pictures of moving clouds so I could make a ten second movie from those pics. Greeting and sorry for my english ;)

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  • Querying Postgresql with a very large result set

    - by sanity
    In an application I need to query a Postgres DB where I expect tens or even hundreds of millions of rows in the result set. I might do this query once a day, or even more frequently. The query itself is relatively simple, although may involve a few JOINs. My question is: How smart is Postgres with respect to avoiding having to seek around the disk for each row of the result set? Given the time required for a hard disk seek, this could be extremely expensive. If this isn't an issue, how does Postgres avoid it? How does it know how to lay out data on the disk such that it can be streamed out in an efficient manner in response to this query?

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  • Handling dynamic number of columns

    - by Whistle
    I'm developing a CMS of sorts, and I want to give my users the possibility of customizing the display. More precisely, I want to give them the ability to choose to display or hide the left column, the right column and/or the top div. The middle column cannot be hidden since this is where the actual content will show, whereas the other columns are for navigation or side menus. I've been looking for a way to make this as smart and flexible as possible. For now I'm using a MasterPage, but that seems to be too constraining. For instance, with MasterPage you need to add a ContentPlaceHolder control in every of your ASPX pages. What are the best practices in this area? I guess a simpler way of saying this would be "I want to create a template system over which I have complete control".

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  • mysql query trouble

    - by Bharanikumar
    Hi , in my database i have phone numbers with country code , which look somthing like 0044-123456 0044-123456 0014-123456 0014-123456 0024-123456 0024-123456 0034-123456 0044-123456 0044-123456 0024-123456 0034-123456 084-123456 084-123456 i want to total up the numbers by country, something like this output 0044 (2) 0024 (2) 0034 (1) 084 (2) 064 (5) Is it possible to do this with a SQL query?

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  • is NATURAL JOIN any better than SELECT FROM WHERE in terms of performance ?

    - by ashy_32bit
    Today I got into a debate with my project manager about Cartesian products. He says a 'natural join' is somehow much better than using 'select from where' because the later cause the db engine to internally perform a Cartesian product but the former uses another approach that prevents this. As far as I know, the natural join syntax is not any different in anyway than 'select from where' in terms of performance or meaning, I mean you can use either based on your taste. SELECT * FROM table1,table2 WHERE table1.id=table2.id SELECT * FROM table1 NATURAL JOIN table2 please elaborate about the first query causing a Cartesian product but the second one being somehow more smart

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  • How to convert 3GP video for Android to view?

    - by RedNax
    Hi, I'm creating 3GP videos with the Android - however, when the 3GP files are posted on a site, the same Android phone cannot view it back. (The file works on the iPhone). What is right way to encode/resize the 3GP video so that the video player on Android can play it back? Thanks

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  • can we use jquery for client side validation of a custom validation control?

    - by Mac
    There are two textboxes one for email and other one for phone i have used one custom validation control so that user have to fill any one of textboxes for client side i used javascript function ValidatePhoneEmail(source, args) { var tboxEmail = document.getElementById('<%= tboxEmail.ClientID %>'); var tboxPhone = document.getElementById('<%= tboxPhone.ClientID %>'); if (tboxEmail.value.trim() != '' || tboxPhone.value.trim() != '') { args.IsValid = true; } else { args.IsValid = false; } } how to achieve same result using jquery

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  • Parent-child table layout

    - by cyberzed
    I'm currently planning a piece of software for dogbreeders and I'm in doubt about my datadesign...whether I'm doing something smart or stupid :) The plan at the moment is one holistic "dog" table sorta like this... Id | Name | FatherId | MotherId ------------------------------- 1 | A | 0 | 0 2 | B | 1 | 0 3 | C | 0 | 0 4 | D | 0 | 3 5 | E | 1 | 3 6 | F | 5 | 2 7 | G | 4 | 3 My questions is, is it common to make it like this or is it really sloppy. I can see a quick lookup reason to have it but I'm really in doubt whether it's good or bad in the end. I thinking it would be better designed if I had a rel-table on the side with Id coupling, but I'm really in doubt how well any of the cases are. A side note is that it'll only be me personally looking at the data this way (or someone adopting the project from me)

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  • Subversion 'unadd' ?

    - by british_trader
    I have a number of files I wish to add to subversion. Instead of taking my time and adding each individual one, I decided to be a smart-arse and do a: svn add * .. which was a mistake. Is there a way I can 'unadd' everything? There's about 7 files I wanted to add... it's now highlighted an extra 500+ auto-generated files I didn't mean to add! I haven't committed it yet so hopefully there's a way to undo this!!

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  • How to emulate onLowMemory()?

    - by Samuh
    I have put some instructions in onLowMemory() callback and want to test the same. Is there a "direct" way to test onLowMemory function of the application subclass? Or will I have to just overload the phone by starting many apps and doing memory intensive tasks? Thanks.

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  • Monitoring of Activities visibility

    - by vochupin
    Is it possible to determine the moment of switching of certain Activity from foreground to background and vice versa? This activity should run in the separate process. I need to write the application that collects some statistics from using of big set of applications (app names read from configuration file). My application works as Service and should remember moments of switching of activities between foreground and background. Set of applications is sufficiently big and most part of these applications will never work on certain phone.

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  • SUM minutes SQL server

    - by sandu
    HI guys, My litle problem goes like this : I have this columns : PHONE_NR , TIME ( time field ), Meaning the calling telephone number and call duration. I need to group phone nr and sum the minutes. Filds looks like this : nr time 726028xxx 00:07:07 735560css 00:07:37 726028xxx 00:07:55

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  • which database to use

    - by ranjanarr
    I am developing an App in which I need to authenticate password, store user personal information and setting details / preferences. All these are user-mobile specific or rather App specific and are unique for each user,the password and settings info should not be lost once phone is switched off or user exits the App, which data storage rocedure is recommended for such App?

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