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• Oracle SQL clause evaluation order

  - by jon.johnson

  In Oracle, which clause types get evaluated first? If I had the following ( pretend .... represent valid expressions and relation names ), what would the order of evaluation be? SELECT ... FROM ..... WHERE ........ GROUP BY ........... HAVING ............. ORDER BY ................ I am under the impression that the SELECT clause is evaluated last, but other than that I'm clueless.

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• SQL UPDATE order of evaluation

  - by pilcrow

  What is the order of evaluation in the following query: UPDATE tbl SET q = q + 1, p = q; That is, will "tbl"."p" be set to q or q + 1? Is order of evaluation here governed by SQL standard? Thanks. UPDATE After considering Migs' answer, I ran some tests on all DBs I could find. While I don't know what the standard says, implementations vary. Given CREATE TABLE tbl (p INT NOT NULL, q INT NOT NULL); INSERT INTO tbl VALUES (1, 5); -- p := 1, q := 5 UPDATE tbl SET q = q + 1, p = q; I found the values of "p" and "q" were: database p q -----------------+---+--- Firebird 2.1.3 | 6 | 6 InterBase 2009 | 5 | 6 MySQL 5.0.77 | 6 | 6 Oracle XE (10g) | 5 | 6 PostgreSQL 8.4.2 | 5 | 6

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• view and order by

  - by trojanwarrior3000

  why subquery of view can't have order by clause?

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• T-SQL - how to get around the order by restriction in CTEs

  - by David

  Hi all I have the following CTE. Its purpose is to provide unique Month/Year pairs. Later code will use the CTE to produce a concatenated string list of the Month/Year pairs. ;WITH tblStoredWillsInPeriod AS ( SELECT DISTINCT Kctc.GetMonthAndYearString(DateWillReceived) Month FROM Kctc.StoredWills WHERE DateWillReceived BETWEEN '2010/01/01' AND '2010/03/31' ORDER BY DateWillReceived ) I have omitted the implmementation of the GetMonthAndYearString function as it is trivial. Sadly, it seems T-SQL is always one step ahead. When I run this code, it tells me I'm not allowed to use ORDER BY in a CTE unless I also use TOP (or FOR XML, whatever that is.) If I use TOP, it tells me I can't use it with DISTINCT. Yup, T-SQL has all the answers. Can anyone think of a solution to this problem which is quicker than simply slashing my wrists? I understand that death from blood loss can be surprisingly lingering, and I have deadlines to meet. Thanks for your help. David

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• hibernate order by association

  - by Gary Kephart

  I'm using Hibernate 3.2, and using criteria to build a query. I'd like to add and "order by" for a many-to-one association, but I don't see how that can be done. The Hibernate query would end up looking like this, I guess: select t1.a, t1.b, t1.c, t2.dd, t2.ee from t1 inner join t2 on t1.a = t2.aa order by t2.dd <-- need to add this I've tried criteria.addOrder("assnName.propertyName") but it doesn't work. I know it can be done for normal properties. Am I missing something?

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• argument order in cygwin gcc 4.3 matters when linking with glib-2.0

  - by SetJmp

  I am trying to compile code that works on os x and linux using cygwin. However, I am finding that the argument order to gcc gives unanticipated results. For example, the following fails: gcc -std=gnu99 `pkg-config --libs glib-2.0 --cflags glib-2.0` nb-learn.c but the following works: gcc -std=gnu99 nb-learn.c `pkg-config --libs glib-2.0 --cflags glib-2.0` Can someone explains how this works? Also, are there techniques or code I can look at for getting autoconf to change the argument order depending on the platform? Thanks, SetJmp (gcc 4.3.4)

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• Parallel.For maintain input list order on output list

  - by romeozor

  I'd like some input on keeping the order of a list during heavy-duty operations that I decided to try to do in a parallel manner to see if it boosts performance. (It did!) I came up with a solution, but since this was my first attempt at anything parallel, I'd need someone to slap my hands if I did something very stupid. There's a query that returns a list of card owners, sorted by name, then by date of birth. This needs to be rendered in a table on a web page (ASP.Net WebForms). The original coder decided he would construct the table cell-by-cell (TableCell), add them to rows (TableRow), then each row to the table. So no GridView, allegedly its performance is bad, but the performance was very poor regardless :). The database query returns in no time, the most time is spent on looping through the results and adding table cells etc. I made the following method to maintain the original order of the list: private TableRow[] ComposeRows(List<CardHolder> queryResult) { int queryElementsCount = queryResult.Count(); // array with the query's size var rowArray = new TableRow[queryElementsCount]; Parallel.For(0, queryElementsCount, i => { var row = new TableRow(); var cell = new TableCell(); // various operations, including simple ones such as: cell.Text = queryResult[i].Name; row.Cells.Add(cell); // here I'm adding the current item to it's original index // to maintain order in the output list rowArray[i] = row; }); return rowArray; } So as you can see, because I'm returning a very different type of data (List<CardHolder> -> TableRow[]), I can't just simply omit the ordering from the original query to do it after the operations. Also, I also thought it would be a good idea to Dispose() the objects at the end of each loop, because the query can return a huge list and letting cell and row objects pile up in the heap could impact performance.(?) How badly did I do? Does anyone have a better solution in case mine is flawed?

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• Sorting a vector of (double precision) reals and obtain their order

  - by Philipp

  Hello everyone, in C++ would like to sort a lengthy (2^20) vector of reals, obviously sort() does the trick. Having used R before I was used to the nice order() function which yields the permutation that leads to the sorted vector. Probably someone has done this in C++, maybe it's just my weak google-Fu that prevents me from finding it. And yeah, obivously my C++ newbness could stop me from spotting something straightforward. Example: x = {24, 55, 22, 1} then the permutation perm = {3, 2, 0, 1} maps the original x to the sorted x in ascending order. I can probably implement some bubble sort which does not only sort x but performs the same transpositions on the vector {0,1,2,...} and outputs both, but I believe someone must have thought about it and especially have done it efficiently. Thank you very much, Philipp

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• Sqlite3 activerecord :order => "time DESC" doesn't sort

  - by Ole Morten Amundsen

  rails 2.3.4, sqlite3 I'm trying this Production.find(:all, :conditions = ["time ?", start_time.utc], :order = "time DESC", :limit = 100) The condition works perfectly, but I'm having problems with the :order = time DESC. By chance, I discovered that it worked at Heroku (testing with heroku console), which runs PostgreSQL. However, locally, using sqlite3, new entries will be sorted after old ones, no matter what I set time to. Like this (output has been manually stripped): second entry is new: Production id: 2053939460, time: "2010-04-24 23:00:04", created_at: "2010-04-24 23:00:05" Production id: 2053939532, time: "2010-04-25 10:00:00", created_at: "2010-04-27 05:58:30" Production id: 2053939461, time: "2010-04-25 00:00:04", created_at: "2010-04-25 00:00:04" Production id: 2053939463, time: "2010-04-25 01:00:04", created_at: "2010-04-25 01:00:04" Seems like it sorts on the primary key, id, not time. Note that the query works fine on heroku, returning a correctly ordered list! I like sqlite, it's so KISS, I hope you can help me... Any suggestions?

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• Unexpected behaviour of Order by clause

  - by Newbie

  I have a table which looks like Col1 col2 col3 col4 col5 1 5 1 4 6 1 4 0 3 7 0 1 5 6 3 1 8 2 1 5 4 3 2 1 4 The script is declare @t table(col1 int, col2 int, col3 int,col4 int,col5 int) insert into @t select 1,5,1,4,6 union all select 1,4,0,3,7 union all select 0,1,5,6,3 union all select 1,8,2,1,5 union all select 4,3,2,1,4 If I do a sorting (ascending), the output is Col1 col2 col3 col4 col5 0 1 5 6 3 1 4 0 3 7 1 5 1 4 6 1 8 2 1 5 4 3 2 1 4 The query is Select * from @t order by col1,col2,col3,col4,col5 But as can be seen that the sorting output is wrong (col2 to col5). I want the output to be every column being sorted in ascending order i.e. Col1 col2 col3 col4 col5 0 1 0 1 3 1 3 1 1 4 1 4 2 3 5 1 5 2 4 6 4 8 5 6 7 Why so and how to overcome this? Thanks in advance

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• c++ std::map question about iterator order

  - by jbu

  Hi all, I am a C++ newbie trying to use a map so I can get constant time lookups for the find() method. The problem is that when I use an iterator to go over the elements in the map, elements do not appear in the same order that they were placed in the map. Without maintaining another data structure, is there a way to achieve in order iteration while still retaining the constant time lookup ability? Please let me know. Thanks, jbu edit: thanks for letting me know map::find() isn't constant time.

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• Linq To SQL: Retain list order when using .Contains

  - by rockinthesixstring

  I'm using Lucene.net to build a MyListOfIds As List(Of Integer) which I then pass on to my Linq service. I then search the database as follows Return _EventRepository.Read().Where(Function(e) MyListOfIds.Contains(e.ID)).ToList Now I know that Lucene is already ordering MyListOfIds based on the weight it gave each term. What sucks is that Linq is losing that order in it's SQL search. My Question: How can I retain that sort order when building my Lambda expression? I tried using LINQPad to see how the query is being built, but because I had to declare a variable LINQPad didn't show me the resultant SQL :-( Here's what I tried in LINQPad Dim i As New List(Of Integer) i.Add(1) i.Add(100) i.Add(15) i.Add(3) i.Add(123) Dim r = (From e In Events Where i.Contains(e.ID) Select e) note: my example is in VB.NET, but I don't mind if responses are in C#

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• MySQL ORDER BY returns things in (apparently) random order !?

  - by Luke H

  The following query: SELECT DISTINCT ClassName FROM SiteTree ORDER BY ClassName is returning things in no apparent order! I get the same result whether I quote column/table names, or use DISTINCT or not, or add ASC or DESC. I assumed the indexes might be broken, or something like this, so tried dropping and recreating. Also tried REPAIR TABLE and CHECK TABLE. The table collation is set to latin1_swedish_ci. All the textual columns are set to use UTF-8 and collation is set to utf8_general_ci What could be causing this?

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• How to get the records using order by and so on

  - by paulrajj

  I have a table categories containing categories id having the records of 1 to 20. when i am doing the search query by using the IN function in mysql i got the results. but i am struggling to get the results using order by. The limit may be vary for every search as this is one of the input value. For example I have tried this query to find out the search results, select * from categories where category in (20,16,12,8) order by rand(), id limit 0,6 this query is executed and the results are in random category_id. the results will be, 8 12 16 20 and following this, another two records must be 8 12 If category_id contains only one record for 8 then, it should follow from 12,16. How can i achieve this ? thanks in advance.

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• SQL Server 2008 Delete Records from Self-Referencing Table in correct order

  - by KTrace

  I need to delete a sub set of records from a self-referencing table in SQL Server 2008. I am trying to do the following but it is does not like the order by. WITH SelfReferencingTable (ID, depth) AS ( SELECT id, 0 as [depth] FROM dbo.Table WHERE parentItemID IS NULL AND [t].ColumnA = '123' UNION ALL SELECT [t].ID, [srt].[depth] + 1 FROM dbo.Table t INNER JOIN SelfReferencingTable srt ON [t].parentItemID = [srt].id WHERE [t].ColumnA = '123' ) DELETE y FROM dbo.Table y JOIN SelfReferencingTable x on x.ID = y.id ORDER BY x.depth DESC Any ideas why this isn't working?

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• SQL SERVER – SQL Server Misconceptions and Resolution – A Practical Perspective – TechEd 2012 India

  - by pinaldave

  TechEd India 2012 is just around the corner and I will be presenting there in two different sessions. On the very first day of this event, my presentation will be all about SQL Server Misconceptions and Resolution – A Practical Perspective. The dictionary tells us that a “misconception” means a view or opinion that is incorrect and is based on faulty thinking or understanding. In SQL Server, there are so many misconceptions. In fact, when I hear some of these misconceptions, I feel like fainting at that very moment! Seriously, at one time, I came across the scenario where instead of using INSERT INTO…SELECT, the developer used CURSOR believing that cursor is faster (duh!). Here is the link the blog post related to this. Pinal and Vinod in 2009 I have been presenting in TechEd India for last three years. This is my fourth opportunity to present a technical session on SQL Server. Just like the previous years, I decided to present something different. Here is a novelty of this year: I will be presenting this session with Vinod Kumar. Vinod Kumar and I have a great synergy when we work together. So far, we have written one SQL Server Interview Questions and Answers book and 2 video courses: (1) SQL Server Questions and Answers (2) SQL Server Performance: Indexing Basics. Pinal and Vinod in 2011 When we sat together and started building an outline for this course, we had many options in mind for this tango session. However, we have decided that we will make this session as lively as possible while keeping it natural at the same time. We know our flow and we know our conversation highlight, but we do not know what exactly each of us is going to present. We have decided to challenge each other on stage and push each other’s knowledge to the verge. We promise that the session will be entertaining with lots of SQL Server trivia, tips and tricks. Here are the challenges that I’ll take on: I will puzzle Vinod with my difficult questions I will present such misconception that Vinod will have no resolution for it. I need your help.  Will you help me stump Vinod? If yes, come and attend our session and join me to prove that together we are superior (a friendly brain clash, but we must win!). SQL Server enthusiasts and SQL Server fans are going to have gala time at #TechEdIn as we have a very solid lineup of the speaker and extremely interesting sessions at TechEdIn. Read the complete blog post of Vinod. Session Details Title: SQL Server Misconceptions and Resolution – A Practical Perspective (Add to Calendar) Abstract: “Earth is flat”! – An ancient common misconception, which has been proven incorrect as we progressed in modern times. In this session we will see various database misconceptions prevailing and their resolution with the aid of the demos. In this unique session audience will be part of the conversation and resolution. Date and Time: March 21, 2012, 15:15 to 16:15 Location: Hotel Lalit Ashok - Kumara Krupa High Grounds, Bengaluru – 560001, Karnataka, India. Add to Calendar Please submit your questions in the comments area and I will be for sure discussing them during my session. If I pick your question to discuss during my session, here is your gift I commit right now – SQL Server Interview Questions and Answers Book. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Interview Questions and Answers, SQL Performance, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology Tagged: TechEd, TechEdIn

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• Remote connect into macbook pro at a different resolution

  - by user60277

  Hello, I have a Dell laptop with Windows 7 on it. Its resolution is 1920x1080. I want to connect to a macbook pro at that resolution. The macbook pro has a resolution of 1440x900 so when I VNC into it, I can only see 1440x900 box with black borders on full resolution. The macbook pro can drive resolutions of 2560x1440. What program do I use to connect to the macbook at full (1920x1080) resolution. I can use remote desktop and connect from the dell laptop to another dell laptop that has a 1440x900 max. resolution. However in case of Remote desktop connection I can expand the window to be 1920x1080. I'm using TightVNC viewer on Windows. Thanks

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• Remote connect into macbook pro at a different resolution

  - by user60277

  Hello, I have a Dell laptop with Windows 7 on it. Its resolution is 1920x1080. I want to connect to a macbook pro at that resolution. The macbook pro has a resolution of 1440x900 so when I VNC into it, I can only see 1440x900 box with black borders on full resolution. The macbook pro can drive resolutions of 2560x1440. What program do I use to connect to the macbook at full (1920x1080) resolution. I can use remote desktop and connect from the dell laptop to another dell laptop that has a 1440x900 max. resolution. However in case of Remote desktop connection I can expand the window to be 1920x1080. I'm using TightVNC viewer on Windows. Thanks

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• Bad Resolution. Running Three screens at the same time

  - by Carl

  Hi I am currently using three screens at the same time with my ATI 5770 & an active displayport converter. The thing is that the third screen ( the one that is using the active displayport converter ) is showing terrible resolution compared to my other two screens. ( Samsung syncmaster p23 ) two of my screens got a max resolution of 1920* 1090, meanwhile the third on is only capable of 1600 * 1200. Do any of u guys got any solution to this problem? Btw, This is how the Active Displayport converter looks like http://accessories.us.dell.com/sna/products/Cables/productdetail.aspx?c=us&l=en&s=dhs&cs=19&sku=330-5521#Overview

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• Is there a way to get a 10000x10000 virtual resolution desktop?

  - by pingo

  I have a java applet map viewer and I'd like to plot out the map it displays. To do that I need to open it in a high enough resolution to avoid too much stitching. Is there any possible way I could get a desktop with such high resolution? So far I've been able to use panning 2560x1920 by booting windows 7 in VmWare Player. Would it be possible to get it higher? Maybe this would be doable on Linux? The whole thing can be laggy as hell as long as it will render my screenshot...

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• Paypal (sandbox) buy now link redirects to paypal (sandbox) login page instead of order summary

  - by Nicolas

  Hi, Before going live I try to test the paypal process against the paypal sandbox mode, but after the summary of what the user is going to pay on my website(buy now button), the link does not redirect to a paypal summary of the prder but ask the user to connect to paypal. Even after logging into the buyer sandbox account there's no summary of the order. It just disappears. Here's is the code I use on the checkout page: <form action="https://www.sandbox.paypal.com/cgi-bin/webscr" method="post"> <input type="hidden" name="cmd" value="_s-xclick"> <input type="hidden" name="hosted_button_id" value="XXXXXXXXXXXXXXXX"> <input type="hidden" name="notify_url" value="http://www.website.com/paypal/"> <div class="suggestion"> <input type="image" src="https://www.sandbox.paypal.com/en_GB/i/btn/btn_paynowCC_LG.gif" border="0" name="submit" alt="PayPal - The safer, easier way to pay online!"> <img alt="" border="0" src="https://www.sandbox.paypal.com/en_GB/i/scr/pixel.gif" width="1" height="1"> </div> </form> Any idea why it redirects to the payapl login page instead of the order one? Btw I'm using the Website Basic Payment (not PRO then). Cheers, Nicolas.

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• mySQL ORDER BY ASC works, DESC does not...

  - by Ben

  I've "integrated" SMF into Wordpress by querying the forum for a list of the most recent videos from a specific forum board and displaying them on the Wordpress homepage. However when I add the ORDER BY clause, the query (which I tested on other parts of the same page successfully), breaks. To add to the mix, I am using the Auto Embed plugin to allow the videos to be played on the homepage, as well as using a jCarousel feature to rotate them. People were kind enough to help me here last time with the regexp to filter the video urls, I'm hoping for the same luck this time! Here is the entire function (remove the DESC and it works...): function SMF_getRecentVids($limit=10){ global $smf_settingsphp_d; if(file_exists($smf_settingsphp_d)) include($smf_settingsphp_d); include "AutoEmbed-1.4/AutoEmbed.class.php"; $AE = new AutoEmbed(); $connect = new wpdb($db_user,$db_passwd,$db_name,$db_server); $connect->query("SET NAMES 'UTF8'"); $sql = SELECT m.subject, m.ID_MSG, m.body, m.ID_TOPIC, m.ID_BOARD, t.ID_FIRST_MSG FROM {$db_prefix}messages AS m LEFT JOIN {$db_prefix}topics AS t ON (m.ID_TOPIC = t.ID_TOPIC) WHERE (m.ID_BOARD = 8) ORDER BY t.ID_FIRST_MSG DESC"; $vids = $connect->get_results($sql); $c = 0; $content = "imageCarousel_itemList = ["; foreach ($vids as $vid) { if ($c > $limit) continue; //extract video code from body $input = $vid->body; $regexp = "/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i"; if(preg_match_all($regexp, $input, $matches)) { $AE->parseUrl($matches[0][0]); $imageURL = $AE->getImageURL(); $AE->setWidth(290); $AE->setHeight(240); $content .= "{url: '".$AE->getEmbedCode()."', title: '".$vid->subject."', caption: '', description: ''},"; } $c++; } $content .= "]"; echo $content; $wpdb = new wpdb(DB_USER, DB_PASSWORD, DB_NAME, DB_HOST); }

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• Mysql slow query: INNER JOIN + ORDER BY causes filesort

  - by Alexander

  Hello! I'm trying to optimize this query: SELECT `posts`.* FROM `posts` INNER JOIN `posts_tags` ON `posts`.id = `posts_tags`.post_id WHERE (((`posts_tags`.tag_id = 1))) ORDER BY posts.created_at DESC; The size of tables is 38k rows, and 31k and mysql uses "filesort" so it gets pretty slow. I tried to use different indexes, no luck. CREATE TABLE `posts` ( `id` int(11) NOT NULL auto_increment, `created_at` datetime default NULL, PRIMARY KEY (`id`), KEY `index_posts_on_created_at` (`created_at`), KEY `for_tags` (`trashed`,`published`,`clan_private`,`created_at`) ) ENGINE=InnoDB AUTO_INCREMENT=44390 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci CREATE TABLE `posts_tags` ( `id` int(11) NOT NULL auto_increment, `post_id` int(11) default NULL, `tag_id` int(11) default NULL, `created_at` datetime default NULL, `updated_at` datetime default NULL, PRIMARY KEY (`id`), KEY `index_posts_tags_on_post_id_and_tag_id` (`post_id`,`tag_id`) ) ENGINE=InnoDB AUTO_INCREMENT=63175 DEFAULT CHARSET=utf8 +----+-------------+------------+--------+--------------------------+--------------------------+---------+---------------------+-------+-----------------------------------------------------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+------------+--------+--------------------------+--------------------------+---------+---------------------+-------+-----------------------------------------------------------+ | 1 | SIMPLE | posts_tags | index | index_post_id_and_tag_id | index_post_id_and_tag_id | 10 | NULL | 24159 | Using where; Using index; Using temporary; Using filesort | | 1 | SIMPLE | posts | eq_ref | PRIMARY | PRIMARY | 4 | .posts_tags.post_id | 1 | | +----+-------------+------------+--------+--------------------------+--------------------------+---------+---------------------+-------+-----------------------------------------------------------+ 2 rows in set (0.00 sec) What kind of index I need to define to avoid mysql using filesort? Is it possible when order field is not in where clause?

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• C++: Construction and initialization order guarantees

  - by Helltone

  Hi, I have some doubts about construction and initialization order guarantees in C++. For instance, the following code has four classes X, Y, Z and W. The main function instantiates an object of class X. X contains an object of class Y, and derives from class Z, so both constructors will be called. Additionally, the const char* parameter passed to X's constructor will be implicitly converted to W, so W's constructor must also be called. What are the guarantees the C++ standard gives on the order of the calls to the copy constructors? Or, equivalently, this program is allowed to print? #include <iostream> class Z { public: Z() { std::cout << "Z" << std::endl; } }; class Y { public: Y() { std::cout << "Y" << std::endl; } }; class W { public: W(const char*) { std::cout << "W" << std::endl; } }; class X : public Z { public: X(const W&) { std::cout << "X" << std::endl; } private: Y y; }; int main(int, char*[]) { X x("x"); return 0; }

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• How do I determine the draw order in an isometric view flash game?

  - by Gajet

  This is for a flash game, with isometric view. I need to know how to sort object so that there is no need for z-buffer checking when drawing. This might seem easy but there is another restriction, a scene can have 10,000+ objects so the algorithm needs to be run in less than O(n^2). All objects are rectangular boxes, and there are 3-4 objects moving in the scene. What's the best way to do this? UPDATE in each tile there is only object (I mean objects can stack on top of each other). and we access to both map of Objects and Objects have their own position.

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