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Microsoft® SQL Server 2008 R2 Unleashed
book

Microsoft® SQL Server 2008 R2 Unleashed

by Ray Rankins, Paul Bertucci, Chris Gallelli, Alex T. Silverstein
September 2010
Intermediate to advanced content levelIntermediate to advanced
1704 pages
111h 8m
English
Sams
Content preview from Microsoft® SQL Server 2008 R2 Unleashed

Recursive Stored Procedures

A stored procedure can call itself up to the maximum nesting level of 32. This is referred to as recursion. When might you want a stored procedure to be recursive? One common example is when you need to expand a tree relationship. Although a common table expression (CTE) can be used to recursively expand a tree relationship, internally it builds the entire tree before applying any filters to display the tree, starting at a specific level. It is also somewhat limited in how the tree is displayed (see Listing 44.10).

Listing 44.10 Using a Common Table Expression to Expand a Tree Relationship

image

A recursive procedure can ...

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Publisher Resources

ISBN: 9780768696585Purchase book