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SQL Server 2005 Recursive Functions
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Category : Database » Ms SQL Server 2005
SQL Server 2005 has added a new format for queries called a Common Table Expression or . SQL Server 2005 Recursive Functions. by Dan Sullivan. WITH .
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SQL Server 2005 Recursive Functions. SQL Server 2005 has added a new format for queries called a Common Table Expression orCTE. CTE’s are part of the SQL:1999 Specification and represent further compliance with thisspecification by SQL Server. This article will cover using one of the many capabilities of CTE’s,implementing recursive functions. A recursive function is a one that iteratively executes itself.Understanding how CTE’s implement recursive functions is the first step to understanding thefull capabilities of CTE’s. First, we will look at the basic CTE syntax, then how recursive algorithms work, and finally howto use CTE’s to implement them. The basic CTE syntax is a WITH clause that is used as a preface to a SELECT, INSERT,UPDATE, or DELETE statement. In this article, we will be looking specifically at using a CTEwith a SELECT statement. The figure below shows a simple usage of a CTE.
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