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• Is opening too many datacontexts bad?

  - by ryudice

  I've been checking my application with linq 2 sql profiler, and I noticed that it opens a lot of datacontexts, most of them are opened by the linq datasource I used, since my repositories use only the instance stored in Request.Items, is it bad to open too many datacontext? and how can I make my linqdatasource to use the datacontext that I store in…

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• How to select a limited amount of rows for each foreign key?

  - by Keyne

  Hi, I have this table: id feed_id ... Let's say that I have 500 rows and I want to select 3 entries for each feed_id? And 50 as total limit. How to write this SQL?

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• Optimization t-sql query

  - by phenevo

  Hi, I'm newbie in t-sql, and I wonder why this query executes so long ? Is there any way to optimize this ?? update aggregateflags set value=@value where objecttype=@objecttype and objectcode=@objectcode and storagetype=@storagetype and value != 2 and type=@type IF @@ROWCOUNT=0 Select * from aggregateflags where objecttype=@objecttype and…

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• Auto generate varchar Ticket number via DB...

  - by Rusty

  Hello, I'm looking for suggestion on how to get the DB to auto generate Ticket numbers (preferably via the SQL DB) for a varchar column. I have the following tables in the DB: Activities & Cases and would prefer the format to be "Act000001" or "Cse000001". This would be something similar to the identity column property. Any suggestion…

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• SQL query problem

  - by Pankaj

  Hello All I have 2 tables Project and ProjectList like this Project ProjectID Name ProjectListID - allow null In ProjectList ProjectListID ProjName Now what i need here, i want only those recoed from ProjectList table which ProjectListID not in Project table. I made a query but it is taking lot of time to execute. select * FROM…

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• can use more than 1 column in MySQL Group BY?

  - by Am1rr3zA

  Hi, I want write these SQL Query: CREATE VIEW `uniaverage` AS select `averagegrade`.`mjr`,`averagegrade`.`lev` , avg(`averagegrade`.`average`) AS `uniAVG` from `averagegrade` group by `averagegrade`.`lev`, `averagegrade`.`mjr`; But MySQL Query Browser give this error: Operand Should Contain 1 column(s) I somewhere read can use…

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• How can I correctly quote query parameters using DBI?

  - by imerez

  I am dumping the a number of things including the following into a db INSERT statement \"$rec->{reqHdrs}\" However when for example my value for reqHdrs contains quotes it causes the statement to end and thus cause invalid sql. e.g. bla;bla="http://www.yahoo.com/xhtml",bla bla How do I escape the double quotes inside this…

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• internal implementation of database Queries

  - by harigm

  In my experience I have used many queries like select, order by, where clause etc.. in mysql, sql-server, oracle etc For a moment i have thought, 1)how is this internally written to implement the above queries 2) which language do they use? 3) is that programming language? if yes which language? 4)what kind of environment…

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• script to convert mysql dump sql file into format that can be imported into sqlite3 db

  - by spudnik1979

  hi, i have an export sql file containing tables and data from mysql and i want to import it into a sqlite 3 db. please can you tell me the best way? i get error reading file in via sqlite3 binary.

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• Byte to Integer in c#

  - by jtb

  I am reading a row from a SQL Server table. One of the columns is of type tinyint. I want to get the value into an int or int32 variable. rdr.GetByte(j) (byte) rdr.GetValue(j) ...seems to be the only way to retrieve the value. But I can't figure out how to get the result into an int var.

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• asp.net website with sql database hosting into ftp

  - by sravan-grs

  where have to place my published sql database file in ftp. i mean in my website folder or any other folder.

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• In a star schema, are foreign key constraints between facts and dimensions neccessary?

  - by Garett

  I'm getting my first exposure to data warehousing, and I’m wondering is it necessary to have foreign key constraints between facts and dimensions. Are there any major downsides for not having them? I’m currently working with a relational star schema. In traditional applications I’m used to having them, but I started to wonder…

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• Retrieving top 50 rows from Table using LINQ

  - by James

  Hey, Am new to LINQ, and am trying to retrieve the top 50 rows of a particular table. In SQL Server using an actual query i coudl say "Select TOP 50 from Transactions" , but not sure how i need to do that with LinQ Any pointers that could help ? Thanks !

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• Need ad-hoc reporting component

  - by Nelson

  We need some simple ad-hoc reporting solution for our ASP.NET web-site. Just an ability to build a query with user friendly interface, then show the result of this query in some table and maybe export it to Excel or print. The solution must be quite easy for end users (our site visitors) who know nothing about databases,…

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• how do I subtract values from two select statements

  - by fishhead

  I would like to subtract one value from another value. The schema of the table is as follows: tag, datetime,value ------------ tag1, 2010-1-1 10:10:00, 123 tag2, 2010-2-2 10:12:00. 321 select * from ( (Select Max(Value) as [Value1] from History WHERE Datetime ='2010-1-1 10:10' and tagname…

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• DBA - SQL Server 2005 - Backups

  - by subhash.pant

  I am trying to figure out how SQL Server DBAs are doing their backups and verify in 2005. I use the Idera's free stored procs (which is no longer available to download btw) to backup and verify and have gotten around 65% compression. If there any other free alternative? Thanks in advance, -Subhash

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• How to store the file in the database ?

  - by Harikrishna

  How to store the file which is uploaded by the user to the database ? I want to store the file in the database how can we do that ? In the back-end I am using sql with c#.net application.

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• SEC_TO_TIME() convert to java.sql.Time error

  - by chun

  hi I have a aggregate column present the microsecond, a report(with jasper) have to show HH:mm:ss of this indicator What I did is using SEC_TO_TIME(sum(col)/1000) , but when mapping to java.sql.Time, i doesn't work when the value of hour in result pass over 24(ex:36:33:33) Then I think another way, not using…

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• Storing HTML formatted text in database

  - by user279521

  I am building a web site similar to Craigslist. I would like to know how to store the html formatted text (bold / italics / font size etc) in a sql 2008 database? In order words, the user would enter their text, format it with font size, bold etc and save the information. Whats the most efficient way to store…

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• When it comes to updating all rows in a table, does the method of locking matter for performance?

  - by Evan Carroll

  Question is a follow up to this. The SQL in question was UPDATE stats SET visits = (visits+1) And the question is, for the purpose of performance, does it matter if you lock all rows in stats in comparison to locking the table stats? Or, if the database uses a page-lock rather than a table/row lock?

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• Undo Table Updates

  - by sikas

  I updated a table in my MS SQL Server 2008 by accident, I was updating a table from another by copying cell by cell, but I have overwritten the original table. Is there a way that I can restore my table contents as it was?

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• insert value of one col to another on inserting

  - by Sadegh

  hi, i want to insert value of one col to another on inserting new row in sql. how do i? there is any way to do this by default value(constraint)?

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• How to create dynamic table in dbml file?

  - by Naseem

  Hi, I'm using linq to sql. I have a table in dbml file that some of its fields can be generate dynamically (at run time). Is there any way to add fields to a table dynamiccaly , or add a class to dbml file dynamically? Thank you, Naseem

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• Need some sort of "conditional grouping" in MySQL.

  - by serg555

  I have Article table: id | type | date ----------------------- 1 | A | 2010-01-01 2 | A | 2010-01-01 3 | B | 2010-01-01 Field type can be A, B or C. I need to run a report that would return how many articles of each type there is per every day, like this: date | count(type="A") |…

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• mysql error #1452 appearing when trying to add a constraint

  - by user1701484

  I am trying to alter a table so That I can add a foreign key constraint in mysql database: ALTER TABLE `Question` ADD CONSTRAINT `FK_question` FOREIGN KEY (`QuestionId`) REFERENCES `Image_Question` (`QuestionId`) ON DELETE CASCADE ; Problem is that it is giving me this error: 1452 - Cannot add…

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