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  • SQL hidden techniques?

    - by AlexRednic
    What are those pro/subtle techniques that SQL provides and not many know about which also cut code and improve performance? eg: I have just learned how to use CASE statements inside aggregate functions and it totally changed my approach on things. Are there others?

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  • SQL Alias as Table.column

    - by bakerjr
    hi, is it possible to alias an aggregate function in a select clause as AliasTable.AliasColumn? The reason is because I want minimum modifications in my arrays (I'm using PHP). Thanks! P.S. I'm using SQl Server 2008

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  • SQL optimization: deletes taking a long time

    - by Will
    I have an Oracle SQL query as part of a stored proc: DELETE FROM item i WHERE NOT EXISTS (SELECT 1 FROM item_queue q WHERE q.n=i.n) AND NOT EXISTS (SELECT 1 FROM tool_queue t WHERE t.n=i.n); A bit about the tables: item contains about 10k rows with an index on the n column item_queue contains about 1mil rows also with index on n column tool_queue contains about 5mil rows indexed as well I am wondering if the query/subqueries can be optimized somehow to make them run faster, I thought that deletes were generally fairly fast

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  • Other language string in SQL Server 2005

    - by balachandar
    I am trying you insert some string which is not in English (other language). when i fetch back they are not correct. They comes like "?????". But at the same time when I enter the string through the SQL Server UI (SSMS) to enter the string, it works OK. What could be the solution please?

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  • How to organize infinite while loop in mssql ?

    - by alpav
    I want to use infinite WHILE loop in SQL 2005 and use BREAK keyword to exit from it on certain condition. while true does not work, so I have to use while 1=1. Is there a better way to organize infinite loop ? I know that I can use goto, but while 1=1 begin .. end looks better structurally.

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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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  • SQL IN Statement using like syntax?

    - by StackUnderflow
    I would like to do something like this i.e., use wild card characters in the in clause: SELECT * FROM mytable WHERE keywords IN ('%test%', '%testing%') This is not supported in MS SQL.... Is there some other way to achieve it... Looking for something other than: SELECT * FROM mytable WHERE keywords like '%test%' or keywords like '%testing%' or.....

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  • SQl Server - Hierarchical Data

    - by JMSA
    I use SQL Server 2000. Suppose I have two tables like the following: Area ---------------------------------- ID| Name | HierarchyLevel ---------------------------------- 1 | World | 1 2 | America| 2 3 | Europe | 2 4 | Africa | 2 5 | USA | 3 and AreaHierarchy ------------------------ ID | ParentID | ChildID ------------------------ 1 | 1 | 2 2 | 1 | 3 3 | 1 | 4 4 | 2 | 5 where AreaHierarchy.ParentID and AreaHierarchy.ChildID are FKs of Area.ID How can I find the nth parent of USA? Is it possible without looping? Probably not.

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  • SQL Images in different tables

    - by Adonis L
    I am storing images in a SQL database , right now I have images being stored in separate tables depending on the object the images belong to, is there any reason ( performance etc..) why I should keep it this way and not store all images in the same table?

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  • SQL to search duplicates

    - by Ram
    I have a table for animals like Lion Tiger Elephant Jaguar List item Cheetah Puma Rhino I want to insert new animals in this table and I am t reading the animal names from a CSV file. Suppose I got following names in the file Lion,Tiger,Jaguar as these animals are already in "Animals" table, What should be a single SQL query that will determine if the animals are already exist in the table.

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  • Transaction count after EXECUTE indicates that a COMMIT or ROLLBACK TRANSACTION statement is missing

    - by Paresh
    I am getting the error from the application as following with SQL server 2005 "Transaction count after EXECUTE indicates that a COMMIT or ROLLBACK TRANSACTION statement is missing. Previous count = 1, current count = 0" How can i find the stage where this error raised? how can i found the missing transaction or the stored procedure where it is not committ or rollback?

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  • Performance tune my sql query removing OR statements

    - by SmartestVEGA
    I need to performance tune following SQL query by removing "OR" statements Please help ... SELECT a.id, a.fileType, a.uploadTime, a.filename, a.userId, a.CID, ui.username, company.name companyName, a.screenName FROM TM_transactionLog a, TM_userInfo ui, TM_company company, TM_airlineCompany ac WHERE ( a.CID = 3049 ) OR ( a.CID = company.ID AND ac.SERVICECID = 3049 AND company.SPECIFICCID = ac.ID ) OR ( a.USERID = ui.ID AND ui.CID = 3049 );

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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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  • SQL Server - Test the result of a stored procedure

    - by Melursus
    In SQL Server, it is possible to test the result of a stored procedure to know if the result return rows or nothing ? Example : EXEC _sp_MySp 1, 2, 3 IF @@ROWCOUNT = 0 BEGIN PRINT('Empty') END ELSE BEGIN PRINT(@@ROWCOUNT) END But @@ROWCOUNT always return 0 so maybe is there another way of doing this ?

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  • SQL Update with row_number()

    - by user609511
    i m using SQL Server 2008 R2. i want to update my column CODE_DEST with increment number CODE_DEST RS_NOM null qsdf null sdfqsdfqsdf null qsdfqsdf what i want: CODE_DEST RS_NOM 1 qsdf 2 sdfqsdfqsdf 3 qsdfqsdf i have try this: update DESTINATAIRE_TEMP set CODE_DEST = TheId FROM (SELECT Row_Number() OVER (ORDER BY [RS_NOM]) as TheId from DESTINATAIRE_TEMP) not work because of ) and this With DESTINATAIRE_TEMP As ( SELECT ROW_NUMBER() OVER (ORDER BY [RS_NOM] DESC) AS RN FROM DESTINATAIRE_TEMP ) UPDATE DESTINATAIRE_TEMP SET CODE_DEST=RN because of union

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  • Recursive COUNT Query (SQL Server)

    - by Cosmo
    Hello Guys! I've two MS SQL tables: Category, Question. Each Question is assigned to exactly one Category. One Category may have many subcategories. Category Id : bigint (PK) Name : nvarchar(255) AcceptQuestions : bit IdParent : bigint (FK) Question Id : bigint (PK) Title : nvarchar(255) ... IdCategory : bigint (FK) How do I recursively count all Questions for a given Category (including questions in subcategories). I've tried it already based on several tutorials but still can't figure it out :(

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  • sql "Group By" and "Having"

    - by Hans Rudel
    im trying to work through some questions and im not sure how to do the following Q:Find the hard drive sizes that are equal among two or more PCs. its q15 on this site http://www.sql-ex.ru/learn_exercises.php#answer_ref The database scheme consists of four tables: Product(maker, model, type) PC(code, model, speed, ram, hd, cd, price) Laptop(code, model, speed, ram, hd, screen, price) Printer(code, model, color, type, price) any pointers would be appreciated.

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  • SQL qn:- comparing data in rows

    - by rayhan
    hi, i would like to compare numeric data in rows. for eg, i have a table that has a column as such:- Number ====== 1.88 9.99 8.76 9.88 I want to compare 2nd value, 3rd value, 4th value to the 1st value. And then 3rd, 4th value to the 2nd. then 4th to 3rd. How can i construct an sql to do this?

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