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Recursive Queries


Recursive Queries

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martin.edward
martin.edward
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Hello,

I am in the process of creating a recursive query, but have no idea on the basics i.e. recursion,looping through sql statements etc.

Could some give me a drill down ?
Lewis Dowson
Lewis Dowson
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Hi,

Can you give a llittle more info on exactly what it is you need a loop for?

For the time being have a look at the following article (SQL Server 2005, wont work on 2000)


http://msdn.microsoft.com/en-us/library/ms186243.aspx
Lynn Pettis
Lynn Pettis
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Your question is pretty open-ended. It would help us in helping you if you could provide more specifics regarding your problem. Please take the time to also read the first article I reference below in my signature block regarding asking for assistance. if you follow the instructions in that article you we get much better answers to your questions.

Cool
Lynn Pettis

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dmoldovan
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If you're interested in how the recursive queries work, see
http://sqlblog.com/blogs/linchi_shea/archive/2009/04/16/recursive-sql-queries-how-do-they-work.aspx
Jeff Moden
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martin.edward (10/27/2009)
Hello,

I am in the process of creating a recursive query, but have no idea on the basics i.e. recursion,looping through sql statements etc.

Could some give me a drill down ?


The only time you should use recursion is for hierarchies. The only time you should use a loop is for flow control across tables or databases... that leaves out 99.9% of all queries.

Rather than learn the wrong way to do things by learning recursion and loops first, take a look at the following article for an alternative to needing most loops...
http://www.sqlservercentral.com/articles/T-SQL/62867/

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
     Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is usually not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

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