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Query for updating a node in a hierarchial tree structure Real cam lina mark

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The nested set model is a particular technique for representing nested sets (also known as trees or hierarchies) in relational databases.

The term was apparently introduced by Joe Celko; others describe the same technique using different terms.

Id) WHERE P.depth //Calculate path index and set it for each node (except for the root node) ; WITH x AS ( SELECT id, rank() over (partition by parent Id order by id) as pathindex FROM tree WHERE parent Id IS NOT NULL ) UPDATE tree SET pathindex = x.pathindex FROM x WHERE = x.id;//Calculate numerical mapping for nodes (except for the root node) WHILE EXISTS (SELECT * FROM tree WHERE numerical Mapping Is Null) UPDATE T SET T.numerical Mapping = cast(P.numericalmapping as varchar(300)) '.' cast(T.pathindex as varchar(300)) FROM tree AS T INNER JOIN tree AS P ON (T.parent Id = P.Multiple data sources can be associated with a tree structure and can have well-defined relationships among them.Using the example in Figure 19-1, the Accounts Receivable data source is a child of the Finance data source.Now you know an easy way to represent a tree structure numerically in SQL Server.If you have other tips, please share them in the comments.The application visits each node in the tree twice; first during the initial trip, and second during the return trip.