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  • Fast data retrieval in MySQL

    - by trojanwarrior3000
    I have a table of users - It contains around millions of rows (user-id is the primary key). I just want to retrieve user-id and their joining date. Using SELECT user-id, joining-date FROM users requires lot of time. Is there a fast way to query/retrieve the same data from this table?

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  • If/Then in SQL Embedded in VBA

    - by Daniel
    I've got a string like this in my Excel VBA: strSQL = "SELECT * FROM Total WHERE (SimulationID = (" & TextBox1.Text & ") And Test1 = (" & Example & "))" However, sometimes Test will be 'is null', which makes the query And Example = is NULL How can I change it to add an if/then statement or something to make it say And Example is null when Example has a value of "is null"?

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  • why is this rails association loading individually after an eager load?

    - by codeman73
    I'm trying to avoid the N+1 queries problem with eager loading, but it's not working. The associated models are still being loaded individually. Here are the relevant ActiveRecords and their relationships: class Player < ActiveRecord::Base has_one :tableau end Class Tableau < ActiveRecord::Base belongs_to :player has_many :tableau_cards has_many :deck_cards, :through => :tableau_cards end Class TableauCard < ActiveRecord::Base belongs_to :tableau belongs_to :deck_card, :include => :card end class DeckCard < ActiveRecord::Base belongs_to :card has_many :tableaus, :through => :tableau_cards end class Card < ActiveRecord::Base has_many :deck_cards end and the query I'm using is inside this method of Player: def tableau_contains(card_id) self.tableau.tableau_cards = TableauCard.find :all, :include => [ {:deck_card => (:card)}], :conditions => ['tableau_cards.tableau_id = ?', self.tableau.id] contains = false for tableau_card in self.tableau.tableau_cards # my logic here, looking at attributes of the Card model, with # tableau_card.deck_card.card; # individual loads of related Card models related to tableau_card are done here end return contains end Does it have to do with scope? This tableau_contains method is down a few method calls in a larger loop, where I originally tried doing the eager loading because there are several places where these same objects are looped through and examined. Then I eventually tried the code as it is above, with the load just before the loop, and I'm still seeing the individual SELECT queries for Card inside the tableau_cards loop in the log. I can see the eager-loading query with the IN clause just before the tableau_cards loop as well. EDIT: additional info below with the larger, outer loop Here's the larger loop. It is inside an observer on after_save def after_save(pa) @game = Game.find(turn.game_id, :include => :goals) @game.players = Player.find :all, :include => [ {:tableau => (:tableau_cards)}, :player_goals ], :conditions => ['players.game_id =?', @game.id] for player in @game.players player.tableau.tableau_cards = TableauCard.find :all, :include => [ {:deck_card => (:card)}], :conditions => ['tableau_cards.tableau_id = ?', player.tableau.id] if(player.tableau_contains(card)) ... end end end

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  • What's FirstOrDefault for DateTime in Linq?

    - by Keltex
    If I have a query that returns a DateTime, what's the value of FirstOrDefault? Is there a generic way to get the default value of a C# scalar? Example: var list = (from item in db.Items where item.ID==1234 select item.StartDate).FirstOrDefault(); Edit: Assume that the column StartDate can't be null.

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  • MySQL, SQL Select Statement, Where with OR... What's wrong with this?

    - by nobosh
    I'm looking for help with my query below. which is never returning anything for veggie... Is the way I have my WHERE statement written valid? SELECT * FROM newsfeed INNER JOIN newsfeedaction ON newsfeed.newsfeedactionid = newsfeedaction.newsFeedActionID INNER JOIN person ON newsfeed.personID = person.personID LEFT OUTER JOIN food ON newsfeed.foodID = food.foodID LEFT OUTER JOIN veggie ON newsfeed.veggieID = veggie.veggieID WHERE ( newsfeed.veggieID IS NOT NULL AND veggie.deleted = 'N' ) OR ( newsfeed.foodID IS NOT NULL AND food.deleted = 'N')

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  • SQL - How to select a row having a column with max value

    - by Abhi
    date value 18/5/2010, 1 pm 40 18/5/2010, 2 pm 20 18/5/2010, 3 pm 60 18/5/2010, 4 pm 30 18/5/2010, 5 pm 60 18/5/2010, 6 pm 25 i need to query for the row having max(value)(i.e. 60). So, here we get two rows. From that, I need the row with the lowest time stamp for that day(i.e 18/5/2010, 3 pm - 60)

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  • Are Hibernate named HQL queries (in annotations) optimised?

    - by Graham Lea
    A new colleague has just suggested using named HQL queries in Hibernate with annotations (i.e. @NamedQuery) instead of embedding HQL in our XxxxRepository classes. What I'd like to know is whether using the annotation provides any advantage except for centralising quueries? In particular, is there some performances gain, for instance because the query is only parsed once when the class is loaded rather than every time the Repository method is executed?

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  • Mysql limit function doesn't seem to work for me...

    - by chandru_cp
    Here is my query, select t1.dSyllabus_id,t1.dBatch,t1.dFilePathName, t2.dDegreeName,t3.dDepartmentAbbr from tbl_syllabus as t1 join tbl_degree_master as t2, tbl_department_master as t3 where t2.dDegree_id=t1.dDegree_id and t3.dDepartment_id=t1.dDepartment_id and t1.dCollege_id='1' and t1.dIsDelete='0' and i get applying limit , select t1.dSyllabus_id,t1.dBatch,t1.dFilePathName, t2.dDegreeName,t3.dDepartmentAbbr from tbl_syllabus as t1 join tbl_degree_master as t2, tbl_department_master as t3 where t2.dDegree_id=t1.dDegree_id and t3.dDepartment_id=t1.dDepartment_id and t1.dCollege_id='1' and t1.dIsDelete='0' limit 0,5 i get , I dont get the first five records why?

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  • Mysql Left Join Null Result

    - by Ozzy
    I have this query SELECT articles.*, users.username AS `user` FROM `articles` LEFT JOIN `users` ON articles.user_id = users.id ORDER BY articles.timestamp Basically it returns the list of articles and the username that the article is associated to. Now if there is no entry in the users table for a particular user id, the users var is NULL. Is there anyway to make it that if its null it returns something like "User Not Found"? or would i have to do this using php?

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  • In SQL, what's the difference between count(column) and count(*)?

    - by Bill the Lizard
    I have the following query: select column_name, count(column_name) from table group by column_name having count(column_name) > 1; What would be the difference if I replaced all calls to count(column_name) to count(*)? This question was inspired by a previous one. Edit: To clarify the accepted answer (and maybe my question), using count(*) in this case returns an extra row in the result that contains a null and the count of null values in the column.

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  • Varchar2 and Oracle quick question

    - by DAVID
    Hi guys im using varchar2 for a product name field, but when i query the databa from the run SQL command line it shows too many empty spaces, how can i fixe this withouth changing the datatype here is the link to the ss http://img203.imageshack.us/img203/20/varchar.jpg

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  • SQL - Select all when filter value is empty

    - by iansinke
    I have a SQL query in my ASP.net web app that looks like this: SELECT * FROM [Records] WHERE ([title] LIKE '%' + @title + '%') @title, of course, is the value of a text box on the page. My question is, why, when the text box is empty, does this return nothing? And how can I make it return everything, like logic tells me it ought to?

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  • Finding key Solr performance metrics

    - by Mike Malloy
    To improve performance of Solr find your slowest searches, monitor query results, cache hit rate and cache size, document cache and filter cache; find problems with Solr update handlers by tracking index operations and document operations. There is a tool from New Relic which may help. http://www.newrelic.com/solr.html

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  • SQL Server 2005. Full Text Search. Need Thesaurus working with NEAR/AND/OR keywords

    - by user305924
    Hi, does anyone know if it's possible to do a thesaurus search together with NEAR or AND/OR keywords. Here is an example of the type of query I want to run: SELECT Title, RANK FROM Item INNER JOIN CONTAINSTABLE(Item, Title, 'FORMSOF(Thesaurus, "red" NEAR "wine")') AS KEY_TBL ON Item.ItemID = KEY_TBL.[KEY] ORDER BY RANK DESC ....But I get the error message: Syntax error near 'NEAR' in the full-text search condition 'FORMSOF(Thesaurus, "red" NEAR "wine")'.

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  • wamp server not working? or bad php code

    - by lclaud
    I have this PHP code: <?php $username="root"; $password="******";// censored out $database="bazadedate"; mysql_connect("127.0.0.1",$username,$password); // i get unknown constant localhost if used instead of the loopback ip @mysql_select_db($database) or die( "Unable to select database"); $query="SELECT * FROM backup"; $result=mysql_query($query); $num=mysql_numrows($result); $i=0; $raspuns=""; while ($i < $num) { $data=mysql_result($result,$i,"data"); $suma=mysql_result($result,$i,"suma"); $cv=mysql_result($result,$i,"cv"); $det=mysql_result($result,$i,"detaliu"); $raspuns = $raspuns."#".$data."#".$suma."#".$cv."#".$det."@"; $i++; } echo "<b> $raspuns </b>"; mysql_close(); ?> And it should return a single string containing all data from the table. But it says "connection reset when loading page". the log is : [Tue Jun 15 16:20:31 2010] [notice] Parent: child process exited with status 255 -- Restarting. [Tue Jun 15 16:20:31 2010] [notice] Apache/2.2.11 (Win32) PHP/5.3.0 configured -- resuming normal operations [Tue Jun 15 16:20:31 2010] [notice] Server built: Dec 10 2008 00:10:06 [Tue Jun 15 16:20:31 2010] [notice] Parent: Created child process 2336 [Tue Jun 15 16:20:31 2010] [notice] Child 2336: Child process is running [Tue Jun 15 16:20:31 2010] [notice] Child 2336: Acquired the start mutex. [Tue Jun 15 16:20:31 2010] [notice] Child 2336: Starting 64 worker threads. [Tue Jun 15 16:20:31 2010] [notice] Child 2336: Starting thread to listen on port 80. [Tue Jun 15 16:20:35 2010] [notice] Parent: child process exited with status 255 -- Restarting. [Tue Jun 15 16:20:35 2010] [notice] Apache/2.2.11 (Win32) PHP/5.3.0 configured -- resuming normal operations [Tue Jun 15 16:20:35 2010] [notice] Server built: Dec 10 2008 00:10:06 [Tue Jun 15 16:20:35 2010] [notice] Parent: Created child process 1928 [Tue Jun 15 16:20:35 2010] [notice] Child 1928: Child process is running [Tue Jun 15 16:20:35 2010] [notice] Child 1928: Acquired the start mutex. [Tue Jun 15 16:20:35 2010] [notice] Child 1928: Starting 64 worker threads. [Tue Jun 15 16:20:35 2010] [notice] Child 1928: Starting thread to listen on port 80. Any idea why it outputs nothing?

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  • like operator in linq

    - by Luca Romagnoli
    i need to use the like operator in a linq query for this: timb = time.Timbratures.Include("Anagrafica_Dipendente") .Where(p => p.Anagrafica_Dipendente.Cognome + " " + p.Anagrafica_Dipendente.Nome like "%ci%"); How can i do?

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  • JPA is not good enough

    - by Cristiano Sanchez
    Working in a medium size project during last 4 months - we are using JPA and Spring - I'm quite sure that JPA is not powerfull for projects that requires more than CRUD screen... Query interface is poor, Hibernate doesn't respect JPA spec all the time and lot of times I need to use hibernate classes, annotations and config. What do you guys think about JPA? Is it not good enough?

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  • During Spring unit test, data written to db but test not seeing the data

    - by richever
    I wrote a test case that extends AbstractTransactionalJUnit4SpringContextTests. The single test case I've written creates an instance of class User and attempts to write it to the database using Hibernate. The test code then uses SimpleJdbcTemplate to execute a simple select count(*) from the user table to determine if the user was persisted to the database or not. The test always fails though. I was suspect because in the Spring controller I wrote, the ability to save an instance of User to the db is successful. So I added the Rollback annotation to the unit test and sure enough, the data is written to the database since I can even see it in the appropriate table -- the transaction isn't rolled back when the test case is finished. Here's my test case: @ContextConfiguration(locations = { "classpath:context-daos.xml", "classpath:context-dataSource.xml", "classpath:context-hibernate.xml"}) public class UserDaoTest extends AbstractTransactionalJUnit4SpringContextTests { @Autowired private UserDao userDao; @Test @Rollback(false) public void teseCreateUser() { try { UserModel user = randomUser(); String username = user.getUserName(); long id = userDao.create(user); String query = "select count(*) from public.usr where usr_name = '%s'"; long count = simpleJdbcTemplate.queryForLong(String.format(query, username)); Assert.assertEquals("User with username should be in the db", 1, count); } catch (Exception e) { e.printStackTrace(); Assert.assertNull("testCreateUser: " + e.getMessage()); } } } I think I was remiss by not adding the configuration files. context-hibernate.xml <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd> <bean id="namingStrategy" class="org.springframework.beans.factory.config.FieldRetrievingFactoryBean"> <property name="staticField"> <value>org.hibernate.cfg.ImprovedNamingStrategy.INSTANCE</value> </property> </bean> <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean" destroy-method="destroy" scope="singleton"> <property name="namingStrategy"> <ref bean="namingStrategy"/> </property> <property name="dataSource" ref="dataSource"/> <property name="mappingResources"> <list> <value>com/company/model/usr.hbm.xml</value> </list> </property> <property name="hibernateProperties"> <props> <prop key="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</prop> <prop key="hibernate.show_sql">true</prop> <prop key="hibernate.use_sql_comments">true</prop> <prop key="hibernate.query.substitutions">yes 'Y', no 'N'</prop> <prop key="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</prop> <prop key="hibernate.cache.use_query_cache">true</prop> <prop key="hibernate.cache.use_minimal_puts">false</prop> <prop key="hibernate.cache.use_second_level_cache">true</prop> <prop key="hibernate.current_session_context_class">thread</prop> </props> </property> </bean> <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager"> <property name="sessionFactory" ref="sessionFactory"/> <property name="nestedTransactionAllowed" value="false" /> </bean> <bean id="transactionInterceptor" class="org.springframework.transaction.interceptor.TransactionInterceptor"> <property name="transactionManager"> <ref local="transactionManager"/> </property> <property name="transactionAttributes"> <props> <prop key="create">PROPAGATION_REQUIRED</prop> <prop key="delete">PROPAGATION_REQUIRED</prop> <prop key="update">PROPAGATION_REQUIRED</prop> <prop key="*">PROPAGATION_SUPPORTS,readOnly</prop> </props> </property> </bean> </beans> context-dataSource.xml <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close"> <property name="driverClass" value="org.postgresql.Driver" /> <property name="jdbcUrl" value="jdbc\:postgresql\://localhost:5432/company_dev" /> <property name="user" value="postgres" /> <property name="password" value="postgres" /> </bean> </beans> context-daos.xml <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd"> <bean id="extendedFinderNamingStrategy" class="com.company.dao.finder.impl.ExtendedFinderNamingStrategy"/> <bean id="finderIntroductionAdvisor" class="com.company.dao.finder.impl.FinderIntroductionAdvisor"/> <bean id="abstractDaoTarget" class="com.company.dao.impl.GenericDaoHibernateImpl" abstract="true" depends-on="sessionFactory"> <property name="sessionFactory"> <ref bean="sessionFactory"/> </property> <property name="namingStrategy"> <ref bean="extendedFinderNamingStrategy"/> </property> </bean> <bean id="abstractDao" class="org.springframework.aop.framework.ProxyFactoryBean" abstract="true"> <property name="interceptorNames"> <list> <value>transactionInterceptor</value> <value>finderIntroductionAdvisor</value> </list> </property> </bean> <bean id="userDao" parent="abstractDao"> <property name="proxyInterfaces"> <value>com.company.dao.UserDao</value> </property> <property name="target"> <bean parent="abstractDaoTarget"> <constructor-arg> <value>com.company.model.UserModel</value> </constructor-arg> </bean> </property> </bean> </beans> Some of this I've inherited from someone else. I wouldn't have used the proxying that is going on here because I'm not sure it's needed but this is what I'm working with. Any help much appreciated.

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  • how to connect sqlserver cubes using dotnet(C#)

    - by prince23
    hi. i am new to this cubes concept in sqlserver . i need to connect to cubes and and query and get an result and display that result in grid view any help would be great telling how to connect to an cube, articles on it, code any thing that can help me to achieve the result thank you.

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