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• Should I be regularly shrinking my DB or at least my log file?

  - by Tom

  My question is, should I be running one or both of the shrink command regularly, DBCC SHRINKDATABASE OR DBCC SHRINKFILE ============================= background Sql Server: Database is 200 gigs, logs are 150 gigs. running this command SELECT name ,size/128.0 - CAST(FILEPROPERTY(name, 'SpaceUsed') AS int) / 128.0 AS AvailableSpaceInMB FROM sys.database_files;` produces this output.. MyDB: 159.812500 MB free MyDB_Log: 149476.390625 MB free So it seems there is some free space. We backup transaction logs every hour, diff backup 5 nights a week, full backup the other 2 nights of the week.

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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 statement ?

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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 ='tag1') as v1 - ( (Select Max(Value) as [Value2] from History WHERE Datetime ='2010-1-1 10:12' and Tagname ='tag2') as v2)) obviously I am lost...how do I do this. thanks ms-sql

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• Rails 2.3: How to create this SQL into a named_scope

  - by randombits

  Having a bit of difficulty figuring out how to create a named_scope from this SQL query: select * from foo where id NOT IN (select foo_id from bar) AND foo.category = ? ORDER BY RAND() LIMIT 1; Category should be variable to change. What's the most efficient way the named_scope can be written for the problem above?

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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 required to implement this kind of complex database

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• How to use an IN clause in iBATIS?

  - by furtelwart

  I'm using iBATIS to create select statements. Now I would like to implement the following SQL statement with iBATIS: SELECT * FROM table WHERE col1 IN ('value1', 'value2'); With the following approach, the statement is not prepared correctly and no result returns: SELECT * FROM table WHERE col1 IN #listOfValues#; iBATIS seems to restructure this list and tries to interpret it as a string. How can I use the IN clause correctly?

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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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• What is the best way to implement multilingual domain objects using NHibernate?

  - by Amitabh

  I have found few links but could not decide which one is the best way. http://fabiomaulo.blogspot.com/2009/06/localized-property-with-nhibernate.html (This stores all localised language data in one field. Can be a problem if we query from Sql) http://ayende.com/Blog/archive/2006/12/26/LocalizingNHibernateContextualParameters.aspx (This one has a warning at the beginning that it is a hack and no longer supported) http://www.webdevbros.net/2009/06/24/create-a-multi-languaged-domain-model-with-nhibernate-and-c/ (This does not describe how multilingual data will be structured in the database.)

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• Find Specific Rows

  - by H07R0D

  I'm trying to build a rather specific query to find a set of user_ids based on topics they have registered to. Unfortunately it's not possible to refactor the tables so I have to go with what I've got. Single table with user_id and registration_id I need to find all user_ids that have a registration_id of (4 OR 5) AND NOT 1 Each row is a single user_id/registration_id combination. My SQL skills aren't the best, so I'm really scratching my brain. Any help would be greatly appreciated.

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• Setting options with Linq

  - by boris callens

  I'm in a situation where I want to add the equivalent of the sql statement SET QUERY_GOVERNOR_COST_LIMIT to my query I created with linq to entities. How would I go about that?

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• Need some information regarding data warehousing field

  - by Mirage

  I am a web developer and i would like to shift my field to data warehousing. Can anyone please give me some idea , which langauges or stuff i need to learn like cogonos , datastage, etl or IF anyone currently working can guide me how can i start , i will thankful to you. DO i nned to do oracle because i know mysql , sql. My basic understanding with databse is good. Any books

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• What's the best, Escape then store Or store then escape the output?

  - by Axel

  Hi, After doing a long search on stackoverflow i didn't find any one talked about this even if it's a big choice, the Question is what's the best in order to prevent both of XSS and SQL injection, Escaping the data then store it in the DB or Store it as it is and escape when output it? Note: it is better if you give some examples of practics if possible. Thanks

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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 if they were needed in this case. I’m currently working in a SQL Server 2005 environment.

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• how to get only two number after decimal

  - by Manoj Wadhwani

  i have money field in sql table when i m extracting record by table and binding it to datagrid it show money as well 100.0000 four character from decimal i need only two . Plz suggest.

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• How to make the process quicker?

  - by dewacorp.alliances

  We build a system that handling the billing analyse and what it does it just have a raw bill from vendor and process to "common" table and this is using SQL Server 2005 Integration Services. At the moment, the batch has 300,000 rows and it took about 6 minutes to process. Now, the current spec are: 2 CPUs Intel Xeon E5345 @ 2.33 GHz RAM 4GB Is there anyway I can speed up this process?

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• selecting data from table based on date .

  - by mehdi

  i have database table like this +-------+--------------+----------+ | id | ip | date | +-------+--------------+----------+ | 505 |192.168.100.1 |2010-04-03| | 252 |192.168.100.5 |2010-03-03| | 426 |192.168.100.6 |2010-03-03| | 201 |192.168.100.7 |2010-04-03| | 211 |192.168.100.10|2010-04-03| +-------+--------------+----------+ how can i retirive data from this table where month=03 how to write sql to do that . select * from table where month=03 something like that .

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• ALTER TABLE my_table ADD @column INT

  - by Andreas

  If i want to use a variable as name of the new column, is this posiblem in MS SQL? Example that dont work: ALTER TABLE my_table ADD @column INT

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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, SQL and other tech stuff.

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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 or update a child row: a foreign key constraint fails (mobile_app. '#sql-4517_15241', CONSTRAINT FK_question FOREIGN KEY (QuestionId) REFERENCES Image_Question (QuestionId) ON DELETE CASCADE) What does this error actually mean and what are the possible solutions I might have to undertake in order to fix this?

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• Php sql injection protection

  - by Ajay

  Hi All, I am using mysql_real_escape_string($_REQUEST['page']) in my code. Is it able to prevent SQL Injection in my php code else i will have to do more protection ? Thanks

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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 that in a database?

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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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• Android - getting data from a server

  - by jonhobbs

  I've read lots about using local storage for android but how would I connect to an SQL database online to send and get data? For example, if I was making a game and wanted to create a worldwide high score table, how would I store that online and make sure it was only available to that app? Thanks, Jon

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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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• SQLite3 Integer Max Value

  - by peterwkc

  Hello to all, what is the maximum value of data type INTEGER in sqlite3 ? How do you store ip address in database ? What is attached ? How to create table which belongs to a specific database using sql ddl? What is this error about ? error while the list of system catalogue : no such table: temp.sqlite_master Unable to execute statement Does sqlite3 text data type supoports unicode? Thanks.

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