| 摘要 |
Nodes of a tree are dynamically generated. A user may specify that a node should have a separate child node for each unique value that occurs in a particular column of a relational table. A user may specify that a node should have a separate child node for each range of values in a user-specified set of ranges. Child nodes of a particular node may be dynamically determined and displayed by querying one or more relational tables for records that satisfy all of the criteria that are implied by that particular node and that particular node's parents. As a result of the foregoing techniques, users are not forced to create a tree node-by-node; instead, users can specify criteria based on which a whole level of nodes should be created, and a whole level of nodes may be added to a tree based on those criteria.
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