July 2012
Intermediate to advanced
816 pages
27h 38m
English
Content preview from Programming Microsoft® SQL Server® 2012Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Querying Hierarchical Tables
With a hierarchical table populated and indexed, you’re ready to start writing efficient queries against it using some more methods available on the hierarchyid type.
The IsDescendantOf Method
The IsDescendantOf method is invoked on one hierarchyid value and accepts another hierarchyid value as its parameter. It returns a bit (Boolean) value of 1 (true) if the hierarchyid that the method is invoked on is a descendant (either directly or indirectly) of the hierarchyid that is passed in as the parameter. Thus, this method essentially returns a subtree whose root is the node specified by the parameter. Because of its vertical traversal, it delivers very fast performance for tables that have a depth-first index.
You can easily ...
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