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  • question about select() and range of for loop to read sockets

    - by Fantastic Fourier
    Just a quick question about using select(). I'm using select() to read from multiple sockets. When I looked up examples on how to use select(), a lot of tutorials showed going through for loops and checking for FD_ISSET. The problem I have with those tutorials is that the for loop starts from i = 0. and checks if the bit has been set for the file descriptor i using FD_ISSET. Couldn't the for loop start from say your minfd (just like how you would keep track of maxfd)?? Or am I missing something?? Following link is an example of such for loop (look at the fourth example that he gives) http://www.developerweb.net/forum/showthread.php?t=2933 If that was the only example out there that used such for loop, I might understand it was a mistake or bad coding but I've seen several examples of such for loop of uselessly going through literally thousands of sockets and I'm convinced I'm missing something. Any comments or inputs are appreciated.

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  • IE6 SELECT HTML tag causes rest of page to vanish

    - by Jonas Byström
    The following HTML does not work in IE6 for me: <html><body>This text is visible.<textarea>This too.</textarea> This is not visible. <select><option value="a">A</option><option value="b">B</option></select> Neither is this. <textarea>Nor this.</textarea> Nor this. </body></html> In IE6, every time I put a select drop-down in the code, everything thereafter dissappears (and some before too, as you can see). All texts are visible in both IE8 and Firefox. Is this a known bug on IE6? Could it have something to do with Windows 7? Or could it be my installation of Internet Explorer Collection 1.6.0.6 that is flawed?

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  • Nested Select in Rails

    - by James
    I am working on a Rails application which uses categories for items. My category model is self-joined so that categories can be nested: class Category < ActiveRecord::Base has_many :items # Self Join (categories can have subcategories) has_many :subcategories, :class_name => "Category", :foreign_key => "parent_id" belongs_to :parent, :class_name => "Category" ... end I have a form which allows a user to create an item which currently lists all categories in a select, but they are all listed together: <%= f.label :category_id %> <%= select :item, :category_id, Category.all.collect {|c| [ c.title, c.id ]} %> So the select looks something like this: Category1 Category2 Category3BelongsTo2 Category4BelongsTo1 But what I want is: Category1 - Category4BelongsTo1 Category2 - Category3BelongsTo2 Is there a helper for this (which would be awesome!)? If not, how could I accomplish this? Thanks!

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  • Rails select list reverts to top?

    - by Danny McClelland
    Hi Everyone, I have number of select lists in my rails application like this: <li>Company<span><%= f.select :company_id, Company.all.collect {|m| [m.companyname, m.id]} %></span></li> They all work well, except - sometimes if you go to the edit view, the select list reverts to the top item, not the item that was chosen when creating. So if you go to an edit view and then click update without actually making any changes, the lists default to the top item - even though you didn't touch them. Is there a way around this? Thanks, Danny

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  • Javascript to sort contents of select element

    - by Jangwenyi
    Hi, is there a quick way to sort the items of a select element? Or I have to resort to writing javascript? Please any ideas. <select size="4" name="lstALL" multiple="multiple" id="lstALL" tabindex="12" style="font-size:XX-Small;height:95%;width:100%;"> <option value="0"> XXX</option> <option value="1203">ABC</option> <option value="1013">MMM</option> </select>

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  • Android Dropdown (Select) CSS

    - by roguepixel
    I'm currently writing some stylesheets for mobile browsers and have come across a strange issue in the Android browser. When changing the font-size CSS attribute of a text box the box gets bigger to accomodate the larger text. Doing this on a select box however does not change the size of the select box, but the text still gets larger (actually overlapping the top and bottom of the rendered form element). Can anyone tell me if it's possible to increase the height of select boxes in the Android browser. Or if not point me in the direction of a list of CSS attributes that can be applied to them. Thanks.

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  • SELECT only a certain set of rows at a time

    - by prmatta
    I need to select data from one table and insert it into another table. Currently the SQL looks something like this: INSERT INTO A (x, y, z) SELECT x, y, z FROM B b WHERE ... However, the SELECT is huge, resulting in over 2 millions rows and we think it is taking up too much memory. Informix, the db in this case, runs out of virtual memory when the query is run. How would I go about selecting and inserting a set of rows (say 2000)? Given that I don't think there are any row ids etc.

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  • Dropdown list with a "Select All" option

    - by shawnboy
    I have three dropdown boxes, Region, District, and City. I want my District dropdown to have a "Select All" option so the user can get all Cities in the Region, else just display the City based on the selected District. My query looks like this: IF @district =-2 THEN (SELECT DISTINCT city FROM myTable WHERE RIGHT(Region, 3) = ?) ORDER BY city) ELSE (select DISTINCT city FROM myTable WHERE District = ?) Order by city I'm using vb.net/sql I couldn't find any complex case scenarios in my search either. Any sugguestions would be appreciated!

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  • SQL SELECT INSERTed data from Table

    - by Noam Smadja
    its in ASP Classic. MS-Access DB. i do: INSERT INTO Orders (userId) VALUES (123)" what i want to retrieve is orderNumber from that row. its an auto-increment number. so i did: SELECT orderNumber FROM Orders WHERE userId=123 but since it is on the same page, the SELECT returns: Either BOF or EOF is True, or the current record has been deleted. Requested operation requires a current record. i've seen somewhere RETURNING orderNumber as variable but it was for oracle and i dont know how to implement it into my asp :( set addOrder = Server.CreateObject("ADODB.Command") addOrder.ActiveConnection = MM_KerenDB_STRING addOrder.CommandText = "INSERT INTO Orders (userId) VALUES ("&userId&")" addOrder.CommandType = 1 addOrder.CommandTimeout = 0 addOrder.Prepared = true addOrder.Execute() Dim getOrderNumber Set getOrderNumber = Server.CreateObject("ADODB.Recordset") getOrderNumber.ActiveConnection = MM_KerenDB_STRING getOrderNumber.Source = "SELECT orderNumber FROM Orders WHERE userId=" & userId getOrderNumber.CursorType = 0 getOrderNumber.CursorLocation = 2 getOrderNumber.LockType = 1 getOrderNumber.Open() session("orderNumber") = getOrderNumber.Fields.Item("orderNumber").value

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  • JQuery + Rails + Select Menu

    - by blackpond
    I want to have a select menu to change a field on a Customer dynamically, I've never used Jquery with a select menu, and I'm having problems. The code: <% form_for @customer , :url = { :action = "update" }, :html ={:class = "ajax_form"} do |f| % Pricing: <%= select :customer, :pricing, Customer::PRICING, {}, :onchange = "$('this').closest('form').submit();" % Application.js: $(document).ready(function(){ $(".ajax_link").live("click",function(event){ //take div class = ajax_link and call this funciton when clicked. event.preventDefault(); // cancels http request $.post($(this).attr("href"), null, null, "script"); return false; }); ajaxFormSubmitHooks(); }); function ajaxFormSubmitHooks(){ $(".ajax_form").submit(function(event){ event.preventDefault(); // cancels http request $.post($(this).attr("action"), $(this).serializeArray(), null, "script"); return false; }); }

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  • Why do two patterns (/.*) and (.*) match different strings? @per-directory (.htaccess) mod_rewrite RewriteRule

    - by Leftium
    Shouldn't the two patterns (/.*) and (.*) match the same string? My real question is actually: where did the "abc" go? Something funky seems to be happening inside the mod_rewrite engine... Given this .htaccess file in www/dir/: Options +FollowSymlinks RewriteEngine on RewriteRule (/.*) print_url_args.php?result=$1 A request for http://localhost/dir/abc/123/ results in: result ($1) = "/123/" $_REQUEST_URI = "/dir/abc/123/" If the / is removed from the pattern like RewriteRule (.*) print_url_args.php?result=$1 The same request for http://localhost/dir/abc/123/ results in: result ($1) = "print_url_args.php" $_REQUEST_URI = "/dir/abc/123/" update: posted rewrite log. 127.0.0.1 - - [15/Feb/2011:14:21:51 +0900] [localhost/sid#1333140][rid#23cd4a8/initial] (3) [perdir C:/db/www/dir/] add path info postfix: C:/db/www/dir/abc - C:/db/www/dir/abc/123/ 127.0.0.1 - - [15/Feb/2011:14:21:51 +0900] [localhost/sid#1333140][rid#23cd4a8/initial] (3) [perdir C:/db/www/dir/] strip per-dir prefix: C:/db/www/dir/abc/123/ - abc/123/ 127.0.0.1 - - [15/Feb/2011:14:21:51 +0900] [localhost/sid#1333140][rid#23cd4a8/initial] (3) [perdir C:/db/www/dir/] applying pattern '(/.*)$' to uri 'abc/123/' 127.0.0.1 - - [15/Feb/2011:14:21:51 +0900] [localhost/sid#1333140][rid#23cd4a8/initial] (2) [perdir C:/db/www/dir/] rewrite 'abc/123/' - 'print_url_args.php?result=/123/' 127.0.0.1 - - [15/Feb/2011:14:21:51 +0900] [localhost/sid#1333140][rid#23cd4a8/initial] (3) split uri=print_url_args.php?result=/123/ - uri=print_url_args.php, args=result=/123/ 127.0.0.1 - - [15/Feb/2011:14:21:51 +0900] [localhost/sid#1333140][rid#23cd4a8/initial] (3) [perdir C:/db/www/dir/] add per-dir prefix: print_url_args.php - C:/db/www/dir/print_url_args.php 127.0.0.1 - - [15/Feb/2011:14:21:51 +0900] [localhost/sid#1333140][rid#23cd4a8/initial] (2) [perdir C:/db/www/dir/] strip document_root prefix: C:/db/www/dir/print_url_args.php - /dir/print_url_args.php 127.0.0.1 - - [15/Feb/2011:14:21:51 +0900] [localhost/sid#1333140][rid#23cd4a8/initial] (1) [perdir C:/db/www/dir/] internal redirect with /dir/print_url_args.php [INTERNAL REDIRECT] 127.0.0.1 - - [15/Feb/2011:14:21:51 +0900] [localhost/sid#1333140][rid#43833c8/initial/redir#1] (3) [perdir C:/db/www/dir/] strip per-dir prefix: C:/db/www/dir/print_url_args.php - print_url_args.php 127.0.0.1 - - [15/Feb/2011:14:21:51 +0900] [localhost/sid#1333140][rid#43833c8/initial/redir#1] (3) [perdir C:/db/www/dir/] applying pattern '(/.*)$' to uri 'print_url_args.php' 127.0.0.1 - - [15/Feb/2011:14:21:51 +0900] [localhost/sid#1333140][rid#43833c8/initial/redir#1] (1) [perdir C:/db/www/dir/] pass through C:/db/www/dir/print_url_args.php 127.0.0.1 - - [15/Feb/2011:14:24:54 +0900] [localhost/sid#1333140][rid#23bf470/initial] (3) [perdir C:/db/www/dir/] add path info postfix: C:/db/www/dir/abc - C:/db/www/dir/abc/123/ 127.0.0.1 - - [15/Feb/2011:14:24:54 +0900] [localhost/sid#1333140][rid#23bf470/initial] (3) [perdir C:/db/www/dir/] strip per-dir prefix: C:/db/www/dir/abc/123/ - abc/123/ 127.0.0.1 - - [15/Feb/2011:14:24:54 +0900] [localhost/sid#1333140][rid#23bf470/initial] (3) [perdir C:/db/www/dir/] applying pattern '(.*)$' to uri 'abc/123/' 127.0.0.1 - - [15/Feb/2011:14:24:54 +0900] [localhost/sid#1333140][rid#23bf470/initial] (2) [perdir C:/db/www/dir/] rewrite 'abc/123/' - 'print_url_args.php?result=abc/123/' 127.0.0.1 - - [15/Feb/2011:14:24:54 +0900] [localhost/sid#1333140][rid#23bf470/initial] (3) split uri=print_url_args.php?result=abc/123/ - uri=print_url_args.php, args=result=abc/123/ 127.0.0.1 - - [15/Feb/2011:14:24:54 +0900] [localhost/sid#1333140][rid#23bf470/initial] (3) [perdir C:/db/www/dir/] add per-dir prefix: print_url_args.php - C:/db/www/dir/print_url_args.php 127.0.0.1 - - [15/Feb/2011:14:24:54 +0900] [localhost/sid#1333140][rid#23bf470/initial] (2) [perdir C:/db/www/dir/] strip document_root prefix: C:/db/www/dir/print_url_args.php - /dir/print_url_args.php 127.0.0.1 - - [15/Feb/2011:14:24:54 +0900] [localhost/sid#1333140][rid#23bf470/initial] (1) [perdir C:/db/www/dir/] internal redirect with /dir/print_url_args.php [INTERNAL REDIRECT] 127.0.0.1 - - [15/Feb/2011:14:24:54 +0900] [localhost/sid#1333140][rid#23fda10/initial/redir#1] (3) [perdir C:/db/www/dir/] strip per-dir prefix: C:/db/www/dir/print_url_args.php - print_url_args.php 127.0.0.1 - - [15/Feb/2011:14:24:54 +0900] [localhost/sid#1333140][rid#23fda10/initial/redir#1] (3) [perdir C:/db/www/dir/] applying pattern '(.*)$' to uri 'print_url_args.php' 127.0.0.1 - - [15/Feb/2011:14:24:54 +0900] [localhost/sid#1333140][rid#23fda10/initial/redir#1] (2) [perdir C:/db/www/dir/] rewrite 'print_url_args.php' - 'print_url_args.php?result=print_url_args.php' 127.0.0.1 - - [15/Feb/2011:14:24:54 +0900] [localhost/sid#1333140][rid#23fda10/initial/redir#1] (3) split uri=print_url_args.php?result=print_url_args.php - uri=print_url_args.php, args=result=print_url_args.php 127.0.0.1 - - [15/Feb/2011:14:24:54 +0900] [localhost/sid#1333140][rid#23fda10/initial/redir#1] (3) [perdir C:/db/www/dir/] add per-dir prefix: print_url_args.php - C:/db/www/dir/print_url_args.php 127.0.0.1 - - [15/Feb/2011:14:24:54 +0900] [localhost/sid#1333140][rid#23fda10/initial/redir#1] (1) [perdir C:/db/www/dir/] initial URL equal rewritten URL: C:/db/www/dir/print_url_args.php [IGNORING REWRITE]

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  • berkeley DB: can't compile c++ codes

    - by Brian
    When I compiled the sample codes of C++, I got following info: c++ excxx_example_database_read.cpp -o dbApp -I /usr/local/BerkeleyDB.5.0/include/ Undefined symbols: "Dbt::Dbt(void*, unsigned int)", referenced from: show_vendor(MyDb&, char const*)in ccnaWItX.o show_item(MyDb&, MyDb&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)in ccnaWItX.o "Dbc::get(Dbt*, Dbt*, unsigned int)", referenced from: show_all_records(MyDb&, MyDb&) in ccnaWItX.o show_item(MyDb&, MyDb&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)in ccnaWItX.o show_item(MyDb&, MyDb&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)in ccnaWItX.o "Dbc::close()", referenced from: show_all_records(MyDb&, MyDb&) in ccnaWItX.o show_all_records(MyDb&, MyDb&) in ccnaWItX.o show_all_records(MyDb&, MyDb&) in ccnaWItX.o show_item(MyDb&, MyDb&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)in ccnaWItX.o show_item(MyDb&, MyDb&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)in ccnaWItX.o show_item(MyDb&, MyDb&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)in ccnaWItX.o "Dbt::~Dbt()", referenced from: show_vendor(MyDb&, char const*)in ccnaWItX.o show_vendor(MyDb&, char const*)in ccnaWItX.o show_vendor(MyDb&, char const*)in ccnaWItX.o show_vendor(MyDb&, char const*)in ccnaWItX.o show_all_records(MyDb&, MyDb&) in ccnaWItX.o show_all_records(MyDb&, MyDb&) in ccnaWItX.o show_all_records(MyDb&, MyDb&) in ccnaWItX.o show_all_records(MyDb&, MyDb&) in ccnaWItX.o show_item(MyDb&, MyDb&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)in ccnaWItX.o show_item(MyDb&, MyDb&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)in ccnaWItX.o show_item(MyDb&, MyDb&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)in ccnaWItX.o show_item(MyDb&, MyDb&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)in ccnaWItX.o "Db::~Db()", referenced from: MyDb::~MyDb() in ccnaWItX.o MyDb::~MyDb() in ccnaWItX.o "typeinfo for DbException", referenced from: GCC_except_table3 in ccnaWItX.o GCC_except_table4 in ccnaWItX.o GCC_except_table5 in ccnaWItX.o GCC_except_table6 in ccnaWItX.o __ZTI11DbException$non_lazy_ptr in ccnaWItX.o "DbException::~DbException()", referenced from: __ZN11DbExceptionD1Ev$non_lazy_ptr in ccnaWItX.o "MyDb::close()", referenced from: MyDb::~MyDb() in ccnaWItX.o "MyDb::MyDb(std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&, bool)", referenced from: _main in ccnaWItX.o _main in ccnaWItX.o _main in ccnaWItX.o "Dbt::Dbt()", referenced from: show_vendor(MyDb&, char const*)in ccnaWItX.o show_all_records(MyDb&, MyDb&) in ccnaWItX.o show_all_records(MyDb&, MyDb&) in ccnaWItX.o show_item(MyDb&, MyDb&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)in ccnaWItX.o "DbException::get_errno() const", referenced from: show_vendor(MyDb&, char const*)in ccnaWItX.o show_all_records(MyDb&, MyDb&) in ccnaWItX.o show_item(MyDb&, MyDb&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)in ccnaWItX.o _main in ccnaWItX.o "DbException::DbException(DbException const&)", referenced from: show_vendor(MyDb&, char const*)in ccnaWItX.o show_all_records(MyDb&, MyDb&) in ccnaWItX.o show_item(MyDb&, MyDb&, std::basic_string<char, std::char_traits<char>, std::allocator<char> >&)in ccnaWItX.o ld: symbol(s) not found collect2: ld returned 1 exit status I have no idea what is the problem. Please help!

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  • Form is trying to save the login value of the submit button to my DB.

    - by Sergio Tapia
    Here's my Zend code: <?php require_once ('Zend\Form.php'); class Sergio_Form_registrationform extends Zend_Form { public function init(){ /*********************USERNAME**********************/ $username = new Zend_Form_Element_Text('username'); $alnumValidator = new Zend_Validate_Alnum(); $username ->setRequired(true) ->setLabel('Username:') ->addFilter('StringToLower') ->addValidator('alnum') ->addValidator('regex', false, array('/^[a-z]+/')) ->addValidator('stringLength',false,array(6,20)); $this->addElement($username); /*********************EMAIL**********************/ $email = new Zend_Form_Element_Text('email'); $alnumValidator = new Zend_Validate_Alnum(); $email ->setRequired(true) ->setLabel('EMail:') ->addFilter('StringToLower') ->addValidator('alnum') ->addValidator('regex', false, array('/^[a-z]+/')) ->addValidator('stringLength',false,array(6,20)); $this->addElement($email); /*********************PASSWORD**********************/ $password = new Zend_Form_Element_Password('password'); $alnumValidator = new Zend_Validate_Alnum(); $password ->setRequired(true) ->setLabel('Password:') ->addFilter('StringToLower') ->addValidator('alnum') ->addValidator('regex', false, array('/^[a-z]+/')) ->addValidator('stringLength',false,array(6,20)); $this->addElement($password); /*********************NAME**********************/ $name = new Zend_Form_Element_Text('name'); $alnumValidator = new Zend_Validate_Alnum(); $name ->setRequired(true) ->setLabel('Name:') ->addFilter('StringToLower') ->addValidator('alnum') ->addValidator('regex', false, array('/^[a-z]+/')) ->addValidator('stringLength',false,array(6,20)); $this->addElement($name); /*********************LASTNAME**********************/ $lastname = new Zend_Form_Element_Text('lastname'); $alnumValidator = new Zend_Validate_Alnum(); $lastname ->setRequired(true) ->setLabel('Last Name:') ->addFilter('StringToLower') ->addValidator('alnum') ->addValidator('regex', false, array('/^[a-z]+/')) ->addValidator('stringLength',false,array(6,20)); $this->addElement($lastname); /*********************DATEOFBIRTH**********************/ $dateofbirth = new Zend_Form_Element_Text('dateofbirth'); $alnumValidator = new Zend_Validate_Alnum(); $dateofbirth->setRequired(true) ->setLabel('Date of Birth:') ->addFilter('StringToLower') ->addValidator('alnum') ->addValidator('regex', false, array('/^[a-z]+/')) ->addValidator('stringLength',false,array(6,20)); $this->addElement($dateofbirth); /*********************AVATAR**********************/ $avatar = new Zend_Form_Element_File('avatar'); $alnumValidator = new Zend_Validate_Alnum(); $avatar ->setRequired(true) ->setLabel('Please select a display picture:'); $this->addElement($avatar); /*********************SUBMIT**********************/ $this->addElement('submit', 'login', array('label' => 'Login')); } } ?> Here's the code I use to save the values: public function saveforminformationAction(){ $form = new Sergio_Form_registrationform(); $request = $this->getRequest(); //if($request->isPost() && $form->isValid($_POST)){ $data = $form->getValues(); $db = $this->_getParam('db'); $db->insert('user',$data); //} } When trying to save the values, I recieve a ghastly error: Column 'login' not found.

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  • ZendSession giving fatal error when trying to include...

    - by Ronedog
    I'm getting an error when trying to include Session.php for the ZendFramework. Here's how I include it: $ZEND_LIBRARY_PATH = "path_to_zend_library_folder"; set_include_path( get_include_path() . PATH_SEPARATOR . $ZEND_LIBRARY_PATH); include_once '../classes/zend/library/zend/Session.php'; $account_info = new Zend_Session_Namespace('account'); The file gets included ok, but I get this error: Cannot redeclare class Zend_Session How can I get this to work?

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  • Android From Local DB (DAO) to Server sync (JSON) - Design issue

    - by Taiko
    I sync data between my local DB and a Server. I'm looking for the cleanest way to modelise all of this. I have a com.something.db package That contains a Data Helper and couple of DAO classes that represents objects stored in the db (I didn't write that part) com.something.db --public DataHelper --public Employee @DatabaseField e.g. "name" will be an actual column name in the DB -name @DatabaseField -salary etc... (all in all 50 fields) I have a com.something.sync package That contains all the implementation detail on how to send data to the server. It boils down to a ConnectionManager that is fed by different classes that implements a 'Request' interface com.something.sync --public interface ConnectionManager --package ConnectionManagerImpl --public interface Request --package LoginRequest --package GetEmployeesRequest My issue is, at some point in the sync process, I have to JSONise and de-JSONise my data (E.g. the Employee class). But I really don't feel like having the same Employee class be responsible for both his JSONisation and his actual representation inside the local database. It really doesn't feel right, because I carefully decoupled the rest, I am only stuck on this JSON thing. What should I do ? Should I write 3 Employee classes ? EmployeeDB @DatabaseField e.g. "name" will be an actual column name in the DB -name @DatabaseField -salary -etc... 50 fields EmployeeInterface -getName -getSalary -etc... 50 fields EmployeeJSON -JSON_KEY_NAME = "name" The JSON key happens to be the same as the table name, but it isn't requirement -name -JSON_KEY_SALARY = "salary" -salary -etc... 50 fields It feels like a lot of duplicates. Is there a common pattern I can use there ?

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  • SQL SERVER – Select and Delete Duplicate Records – SQL in Sixty Seconds #036 – Video

    - by pinaldave
    Developers often face situations when they find their column have duplicate records and they want to delete it. A good developer will never delete any data without observing it and making sure that what is being deleted is the absolutely fine to delete. Before deleting duplicate data, one should select it and see if the data is really duplicate. In this video we are demonstrating two scripts – 1) selects duplicate records 2) deletes duplicate records. We are assuming that the table has a unique incremental id. Additionally, we are assuming that in the case of the duplicate records we would like to keep the latest record. If there is really a business need to keep unique records, one should consider to create a unique index on the column. Unique index will prevent users entering duplicate data into the table from the beginning. This should be the best solution. However, deleting duplicate data is also a very valid request. If user realizes that they need to keep only unique records in the column and if they are willing to create unique constraint, the very first requirement of creating a unique constraint is to delete the duplicate records. Let us see how to connect the values in Sixty Seconds: Here is the script which is used in the video. USE tempdb GO CREATE TABLE TestTable (ID INT, NameCol VARCHAR(100)) GO INSERT INTO TestTable (ID, NameCol) SELECT 1, 'First' UNION ALL SELECT 2, 'Second' UNION ALL SELECT 3, 'Second' UNION ALL SELECT 4, 'Second' UNION ALL SELECT 5, 'Second' UNION ALL SELECT 6, 'Third' GO -- Selecting Data SELECT * FROM TestTable GO -- Detecting Duplicate SELECT NameCol, COUNT(*) TotalCount FROM TestTable GROUP BY NameCol HAVING COUNT(*) > 1 ORDER BY COUNT(*) DESC GO -- Deleting Duplicate DELETE FROM TestTable WHERE ID NOT IN ( SELECT MAX(ID) FROM TestTable GROUP BY NameCol) GO -- Selecting Data SELECT * FROM TestTable GO DROP TABLE TestTable GO Related Tips in SQL in Sixty Seconds: SQL SERVER – Delete Duplicate Records – Rows SQL SERVER – Count Duplicate Records – Rows SQL SERVER – 2005 – 2008 – Delete Duplicate Rows Delete Duplicate Records – Rows – Readers Contribution Unique Nonclustered Index Creation with IGNORE_DUP_KEY = ON – A Transactional Behavior What would you like to see in the next SQL in Sixty Seconds video? Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: Database, Pinal Dave, PostADay, SQL, SQL Authority, SQL in Sixty Seconds, SQL Query, SQL Scripts, SQL Server, SQL Server Management Studio, SQL Tips and Tricks, T SQL, Technology, Video Tagged: Excel

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  • Multiple dependent select boxes, the Rails way?

    - by Adam Carlile
    Hey Guys I am trying to create a car application, each car belongs to a make and model, but only certain makes have certain models. So I would like a series of select boxes that are populated dynamically based on the previous, however I also would like to add another record to that select box if you cant find the one you want. I would just like to know your thoughts on how to accomplish this in a rails way? Cheers Adam

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  • select multiple columns using linq and sum them up

    - by Yustme
    Hi, How can i select multiple columns and calculate the total amount. For example, in my database i got a few fields which are named: 5hunderedBills, 2hunderedBills, 1hunderedBills, etc. And the value of those fields are for example: 5, 2, 3 And the sum would be: 5hunderedBills * 5 + 2hunderedBills * 2 + 1hunderedBills * 3 How can i do that with LINQ in one select statement?

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  • Is my understanding of "select distinct" correct?

    - by paxdiablo
    We recently discovered a performance problem with one of our systems and I think I have the fix but I'm not certain my understanding is correct. In simplest form, we have a table blah into which we accumulate various values based on a key field. The basic form is: recdate date rectime time system varchar(20) count integer accum1 integer accum2 integer There are a lot more accumulators than that but they're all of the same form. The primary key is made up of recdate, rectime and system. As values are collected to the table, the count for a given recdate/rectime/system is incremented and the values for that key are added to the accumulators. That means the averages can be obtained by using accumN / count. Now we also have a view over that table specified as follows: create view blah_v ( recdate, rectime, system, count, accum1, accum2 ) as select distinct recdate, rectime, system, count, value (case when count > 0 then accum1 / count end, 0), value (case when count > 0 then accum2 / count end, 0) from blah; In other words, the view gives us the average value of the accumulators rather than the sums. It also makes sure we don't get a divide-by-zero in those cases where the count is zero (these records do exist and we are not allowed to remove them so don't bother telling me they're rubbish - you're preaching to the choir). We've noticed that the time difference between doing: select distinct recdate from XX varies greatly depending on whether we use the table or the view. I'm talking about the difference being 1 second for the table and 27 seconds for the view (with 100K rows). We actually tracked it back to the select distinct. What seems to be happening is that the DBMS is actually loading all the rows in and sorting them so as to remove duplicates. That's fair enough, it's what we stupidly told it to do. But I'm pretty sure the fact that the view includes every component of the primary key means that it's impossible to have duplicates anyway. We've validated the problem since, if we create another view without the distinct, it performs at the same speed as the underlying table. I just wanted to confirm my understanding that a select distinct can not have duplicates if it includes all the primary key components. If that's so, then we can simply change the view appropriately.

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  • Change event on <select>

    - by adivasile
    If i attach a change event listener on a<select> how do i acces the option that was selected (not just the value, the actual element). $('select').addEvent('change',function(event) { //?? }); Note: i'm using Mootools

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  • Query MSQL for winners, starting at xth place using SELECT

    - by incrediman
    In my MySQL table Winners, I have a list of people who have won. What I'd like to do is select a list of the names of 10 winners. So what I have right now is this: SELECT name FROM Winners ORDER BY points DESC LIMIT 10 This returns the first 10 winners which is great. But how can I make it (for example) return 10 winners, but starting at 20th place?

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