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• Negative Primary Keys

  - by bjax

  Are there any repercussions using Negative Primary Keys for tables (Identity Increment -1, Identity Seed -1 in SQL Server 2005)? The reason for this is we're creating a new database to replace an existing one. There are similar tables between the two databases and we'd like the "source" of the information to be transparent to our applications. The approach is to create views that unions tables from both databases. Negative PKs ensures the identities don't overlap.

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• using FUNCTION instead of CREATE FUNCTION oracle pl/sql

  - by sqlgrasshopper5

  I see people writing a function with FUNCTION instead "CREATE FUNCTION". When I saw this usage in the web I thought it was a typo or something. But in Oreilly's "Oracle 11g PL/SQL Programming" by Steven Feurenstein, the author had used the same thing. But I get errors when I execute that. Could somebody explain is it legal usage or not?. Thanks.

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• Cannot have a qualifier in the select list while performing a JOIN w/ USING keyword.

  - by JuiceBerry123

  I am looking at a practice test that doesn't have explanations about the correct answers. The question I'm confused about basically asks why the following SQL statement can never work: SELECT oi.order_id, product_jd, order_date FROM order_items oi JOIN orders o USING(order_id); The answer it gave was: "The statement would not execute because the column part of the USING clause cannot have a qualifier in the SELECT list" Can someone elaborate on this? I am pretty stumped.

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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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• 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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• stored procedure

  - by leonita

  thx for the answer..can i asked u more question.hehe..since im new in sql...thx b4... how about if i hv 2 loop while @@fetch_status=0 begin set y=y+1 set x=0 while @@fetch_status=0 begin x=y+1 if y = 5 'exit the second do while and back to the first do while -- y=y+1 end end

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• Equals(=) vs. LIKE

  - by T Pops

  When using SQL, are there any benefits of using = in a WHERE clause instead of LIKE? Without any special operators, LIKE and = are the same, right?

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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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• 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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• How to log Entity Framework SQL

  - by Kevin Pang

  I'd like to be able to log all the SQL queries executed by the Entity Framework to log4net. What's the best way to do this?

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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 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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• 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 objectcode=@objectcode and storagetype=@storagetype and value = 2 and type=@type IF @@ROWCOUNT=0 insert into aggregateflags (objectcode,objecttype,value,type,storagetype) select @objectcode,@objecttype,@value,@type,@storagetype @value int @storagetype int @type int @objectcode nvarchar(100) @objecttype int There is not foreign key.

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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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• 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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• sql query for fetching distinct records from table having count greater than 3

  - by saurav

  i have a table with coloumn id , name and city I want to fetch those rows where city is same and the number of rows are greater than 3. Is it possible in single sql query?

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• compare/merge two ms access databases

  - by sprugman

  I've got two ms access .mdb files that I need to compare/merge. Any good tools out there for this? Any way to easily export both to ascii sql where I can use something like Beyond Compare?

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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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• Fastest and stable non-sql database?

  - by Pavel

  What is the fastest and most stable non-sql database to store big data and process thousands requests during the day (it's for traffic exchange service)? I've found Kdb+ and Berkeley DB. Are they good? Are there other options?

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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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• 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 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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• 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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• 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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