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• Linq-to-Entities Left JOIN

  - by shivesh

  This is my query: from forum in Forums join post in Posts on forum equals post.Forum into postGroup from p in postGroup where p.ParentPostID==0 select new { forum.Title, forum.ForumID, LastPostTitle = p.Title, LastPostAddedDate = p.AddedDate }).OrderBy(o=>o.ForumID) Currently the Join is not left join, meaning if some forum doesn't have a post that belongs to it, it will not be returned. The forum without posts must be returned with null (or default) values for the post properties.

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• XQuery performance in SQL Server

  - by Carl Hörberg

  Why does this quite simple xquery takes 10min to execute in sql server (the 2mb xml document stored in one column) compared to 14 seconds when using oxygen/file based querying? SELECT model.query('declare default element namespace "http://www.sbml.org/sbml/level2"; for $all_species in //species, $all_reactions in //reaction where data($all_species/@compartment)="plasma_membrane" and $all_reactions/listOfReactants/speciesReference/@species=$all_species/@id return <result>{data($all_species/@id)}</result>') from sbml;

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• Is there a client-side way to prevent an image from being cached?

  - by morgancodes

  Is it possible to control with javascript whether a browser goes to the server for an image or to the browser cache? Can I force the browser to make a server call when it would otherwise use a cached image? I know I can simply append a query string to my image url, but, if I understand correctly, that works because the browser sees that as a new image. I want the old image to be replaced in the cache.

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• How do I display a dynamically resized image in Kohana without saving it?

  - by Ygam

  I have an image path string stored in a database It goes like: img/uploads/imagename.jpg I have a controller: $this->image = new Image($wines->image) //this is assuming that I have a wines table with the image property $this->image->resize(60, 250, Image::AUTO) echo $this->image->render(); //the problem is nothing is rendered //Is there a better way of doing this? the image path that I am passing at the Image object //instantiation is the result of a query

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• VBA How to find last insert id?

  - by Muiter

  I have this code: With shtControleblad Dim strsql_basis As String strsql_basis = "INSERT INTO is_calculatie (offerte_id) VALUES ('" & Sheets("controleblad").Range("D1").Value & "')" rs.Open strsql_basis, oConn, adOpenDynamic, adLockOptimistic Dim last_id As String last_id = "select last_insert_id()" End With The string last_id is not filled. What is wrong? I need to find te last_insert_id so I can use it in an other query.

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• How to determine sql server object name from object id and database id (sql2000)?

  - by Tomek

  I need the behaviour of sql2005 where function OBJECT_NAME takes two arguments obj id and db id, while sql2000 takes only obj id so the execution must be in the context of the database to which inspected object belongs to. Solution must be possible to implement in a function, so it can be used in a select query.

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• Neo4j 1.9.4 (REST Server,CYPHER) performance issue

  - by user2968943

  I have Neo4j 1.9.4 installed on 24 core 24Gb ram (centos) machine and for most queries CPU usage spikes goes to 200% with only few concurrent requests. Domain: some sort of social application where few types of nodes(profiles) with 3-30 text/array properties and 36 relationship types with at least 3 properties. Most of nodes currently has ~300-500 relationships. Current data set footprint(from console): LogicalLogSize=4294907 (32MB) ArrayStoreSize=1675520 (12MB) NodeStoreSize=1342170 (10MB) PropertyStoreSize=1739548 (13MB) RelationshipStoreSize=6395202 (48MB) StringStoreSize=1478400 (11MB) which is IMHO really small. most queries looks like this one(with more or less WITH .. MATCH .. statements and few queries with variable length relations but the often fast): START targetUser=node({id}), currentUser=node({current}) MATCH targetUser-[contact:InContactsRelation]->n, n-[:InLocationRelation]->l, n-[:InCategoryRelation]->c WITH currentUser, targetUser,n, l,c, contact.fav is not null as inFavorites MATCH n<-[followers?:InContactsRelation]-() WITH currentUser, targetUser,n, l,c,inFavorites, COUNT(followers) as numFollowers RETURN id(n) as id, n.name? as name, n.title? as title, n._class as _class, n.avatar? as avatar, n.avatar_type? as avatar_type, l.name as location__name, c.name as category__name, true as isInContacts, inFavorites as isInFavorites, numFollowers it runs in ~1s-3s(for first run) and ~1s-70ms (for consecutive and it depends on query) and there is about 5-10 queries runs for each impression. Another interesting behavior is when i try run query from console(neo4j) on my local machine many consecutive times(just press ctrl+enter for few seconds) it has almost constant execution time but when i do it on server it goes slower exponentially and i guess it somehow related with my problem. Problem: So my problem is that neo4j is very CPU greedy(for 24 core machine its may be not an issue but its obviously overkill for small project). First time i used AWS EC2 m1.large instance but over all performance was bad, during testing, CPU always was over 100%. Some relevant parts of configuration: neostore.nodestore.db.mapped_memory=1280M wrapper.java.maxmemory=8192 note: I already tried configuration where all memory related parameters where HIGH and it didn't worked(no change at all). Question: Where to digg? configuration? scheme? queries? what i'm doing wrong? if need more info(logs, configs) just ask ;)

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• Update the rank in a MySQL Table

  - by sammichy

  I have the following table structure for a table Player Table Player { Long playerID; Long points; Long rank; } Assuming that the playerID and the points have valid values, can I update the rank for all the players based on the number of points in a single query? If two people have the same number of points, they should tie for the rank.

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• When to throw exceptions?

  - by FRKT

  Exceptions are wonderful things, but I sometimes worry that I throw too many. Consider this example: Class User { public function User(user){ // Query database for user data if(!user) throw new ExistenceException('User not found'); } } I'd argue that it makes as much sense to simply return false (or set all user data to false in this case), rather than throwing an exception. Which do you prefer?

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• find the all the stored procedures and jobs in sql server 2000

  - by kumar

  Hi, In SQL SERVER 2005 This query works fine : Select * from sys.procedures where object_definition(object_id) like '%J%' SELECT * FROM MSDB.DBO.SYSJOBS WHERE NAME LIKE '%J%' but in sql server 2000 it is not working. Here i need to find the all the stored procedures and jobs which matches my string ? how to find in sql server 2000 ? regards, kumar

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• One to Many relashionships for a restaurants website?

  - by myaccount

  Each restaurant has restaurant branches, each branch must determine which days of the week it opens, each of those days must determine (several) open_hour and close_hour thru that day. I created one to many relationship using these tables: rest_names --- rest_branches --- open_days --- open_hours Am I going right this way? or there is another way to do this, maybe less complicated? And how the query will be like to get the hours of a restaurant on a specific day, say sunday?

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• mysql statement with inner SELECT - how to improve performance

  - by ernie

  This statement appears inefficient because only one one out of 10 records are selected and only a of 100 entries contain comments. What can I do to improve it ? $query = "SELECT A,B,C, (SELECT COUNT(*) FROM comments WHERE comments.nid = header_file.nid) as my_comment_count FROM header_file Where A = 'admin' "

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• nHibernate: limit the result set of a mapped collection

  - by HeavyWave

  How do you limit the result set of a mapped collection in nHibernate? For instance: Model.Items; will always return all the Items for the given Model. Is there any way to force it to return only, say, 20 Items without creating a specific query ? Something like Model.Items.SetMaxResults(20); In other words, I would like nHibernate to return IQueryable instead of a simple IList, when I access a collection.

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• jquery hide certain form elements untill a certain textfield has been populated?

  - by Rubytastic

  I have a long signup form and would like to hide a few fields and only show them when a certain input field is populated with text, if the user types some text in this field the other form fields will show. I have looked at hide and show divs but have some trouble getting form elements hide and show them on a certain trigger ( populating a form with text ) anyone can point me in the right direction on how to implement such feature in query ? thx in advanche!

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• Improving performance of cluster index GUID primary key

  - by TheVillageIdiot

  Hi, I've a table with large number of rows (10K+) and it primary key is GUID. The primary key is clustered. The query performance is quite low on this table. Please provide suggestions to make it efficient.

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• text replace with regex in sqlserver

  - by Thiyaneshwaran S

  Currently i have sql-server nvarchar(max) column which has text that starts with """ The only thing that varies in the pattern is the < in the class name. The common part is "" Some sample values are "" "" "" All the These span text are present only at the beginning of the column. Any such matching span in the middle should not be removed or matched. Whats the sql server query with regex to remove all these occurance of span?

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• T-SQL: from rows to columns but not an actual pivot

  - by Matte

  Is there a T-SQL (SQL Server 2008R2) query to transform TABLE_1 into the expected resultset? TABLE_1 +----------+-------------------------+---------+------+ | IdDevice | Timestamp | M300 | M400 | +----------+-------------------------+---------+------+ | 3 | 2012-12-05 16:29:51.000 | 2357,69 | 520 | | 6 | 2012-12-05 16:29:51.000 | 1694,81 | 470 | | 1 | 2012-12-05 16:29:51.000 | 2046,33 | 111 | +----------+-------------------------+---------+------+ Expected resultset +-------------------------+---------+--------+---------+--------+---------+--------+ | Timestamp | 3_M300 | 3_M400 | 6_M300 | 6_M400 | 6_M300 | 6_M400 | +-------------------------+---------+--------+---------+--------+---------+--------+ | 2012-12-05 16:29:51.000 | 2357,69 | 520 | 1694,81 | 470 | 2046,33 | 111 | +-------------------------+---------+--------+---------+--------+---------+--------+

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• Rollback SQL Server 2012 Sequence

  - by VAAA

  I have a SQL Server 2012 Sequence object: /****** Create Sequence Object ******/ CREATE SEQUENCE TestSeq START WITH 1 INCREMENT BY 1; I have a SP that runs some queries inside a transaction: BEGIN TRAN SELECT NEXT VALUE FOR dbo.TestSeq <here all the query update code......> ROLLBACK TRAN If the transaction fails all the updates are rolledback without problem but the Sequence is not rolled back I guess because Its out of the scope of the transaction. Any clue on way to handle that? Thanks

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• How to find column names for all tables in all databases in SQL Server

  - by Salman A

  I want to find all column names in all tables in all databases. Is there a query that can do that for me? The database is Microsoft SQL Server 2000.

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• Maximum of averages

  - by Qtacz

  I'm supposed to get every departments average wage and only show the department with the highest average wage. I figured out this query, but it doesn't work. Anyone got some ideas? SELECT department, max(avg(wage)) FROM employees GROUP BY department; I get this error: ERROR at line 1: ORA-00937: not a single-group group function

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• sharepoint: editing webpart caml

  - by Jack

  I added this code to my sharepoint content query web part, which is looking at an events list from my calender, .webpart file in order to only show recurring events within the next month and regular events within the next month. However, I can't get the web part imported and working. Also is there any way to replace <Month /> with a range like <Today:Today OffsetDays="30"/> except with valid code? Here is the code: <property name="QueryOverride" type="string"> <Where> <Or> <And> <Neq> <FieldRef Name="FRecurrence"/> <Value Type="Recurrance">1</Value> </Neq> <And> <Lt> <FieldRef Name="EventDate" Type="DateTime"/> <Value Type="DateTime"><Today OffsetDays="30"/></Value> </Lt> <Gt> <FieldRef Name="EventDate" Type="DateTime"/> <Value Type="DateTime"><Today /></Value> </Gt> </And> </And> <DataRangesOverlap> <FieldRef Name="EventDate" /> <FieldRef Name="EndDate" /> <FieldRef Name="RecirrenceId" /> <Value Type="DateTime"><Month /></Value> </DataRangesOverlap> </Or> </Where> </property> When I upload this I get "Unable to add selected web part(s). The file format is not valid" and when I add <![CDATA[ and ]]> I can import it but the query doesn't return anything. How can I get this to work?

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• Wordpress - Total User Count who only have posts

  - by knightrider

  I want to display total number of user who only have posts at Wordpress. I can get all users by this query <?php $user_count = $wpdb->get_var("SELECT COUNT(*) FROM $wpdb->users;"); echo $user_count ?> But for the user count only with posts, i think i might need to join another table, does anyone have snippets ? Thanks.

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• IN MSSQL 2008 is there a way to generate a report as to how much space on disk each table takes?

  - by Matt

  IN MSSQL 2008 is there a way to generate a report as to how much space on disk each table takes? I can do it one by one by checking the storage properties, but I was wondering if there was a way, maybe even a query to generate such a report.

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• count and fetch rows in php

  - by Mac Taylor

  hey guys i have a table in my mysql database named (names) now everyone can save their real names now i want to query this table and find out how many times these names used forexample the output should be : Jakob (20) Jenny (17) now this is my own code : list($usernames) =mysql_fetch_row(mysql_query('SELECT name FROM table_user GROUP BY name ORDER BY COUNT(name) DESC LIMIT 50 ')); list($c) =mysql_num_rows(mysql_query('SELECT COUNT(name) FROM table_user GROUP BY name ')); print $usernames.'('.$c.')' is this a correct approach ?!

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• How can you use optional parameters in C#?

  - by kurious

  We're building a web API that's programmatically generated from a C# class (the class has method "GetFooBar(int a, int b)" and the API has a method GetFooBar taking query params like &a=foo&b=bar. The classes needs to support optional parameters, which isn't supported in C# the language. What's the best approach?

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