How does hierarchical Table sorting work in SQL?
This uses a recursive cte to build the hierarchy, and each level, orders by name. If you leave the [path] column in the final select, you will see how it has been built up, and this is used to order the final result set.
How to create multiple level hierarchy in Power BI?
11-06-2018 12:07 AM You will have to modelate your tables in order to get these categories in rows instead of in columns. May be you can create a table with all the categories and make a relation between schools (with the lowest level category in a row ) and your dimension table called categories.
How can I select rows from a hierarchical query?
SQL Fiddle. To my mind, the question is ambiguous: does “the minimum level; i.e. nearest the parent” apply globally (so all results have the same level) or to each sub-tree? If the minimum level is per sub-tree, you can take advantage of how hierarchical queries work and simply stop traversing descendants when your condition is matched:
What do you need to know about level based hierarchies?
About Level-Based Hierarchies. A dimension contains two or more logical levels. When creating logical levels, you should create a Grand Total level and then create child levels, working down to the lowest level. The following are the parts of a dimension: Grand Total level The Grand Total level represents the sum of all totals for a dimension.
SQL Fiddle. To my mind, the question is ambiguous: does “the minimum level; i.e. nearest the parent” apply globally (so all results have the same level) or to each sub-tree? If the minimum level is per sub-tree, you can take advantage of how hierarchical queries work and simply stop traversing descendants when your condition is matched:
About Level-Based Hierarchies. A dimension contains two or more logical levels. When creating logical levels, you should create a Grand Total level and then create child levels, working down to the lowest level. The following are the parts of a dimension: Grand Total level The Grand Total level represents the sum of all totals for a dimension.
Can a skip level hierarchy be an unbalanced hierarchy?
Unbalanced hierarchies are not necessarily the same as parent-child hierarchies. Parent-child hierarchies are unbalanced by nature. Unbalanced level-based hierarchies are possible. A skip-level hierarchy is a hierarchy where there are members that do not have a value for a particular ancestor level.
How does Oracle eliminate rows from a hierarchy?
If the query contains a WHERE clause without a join, then Oracle eliminates all rows from the hierarchy that do not satisfy the condition of the WHERE clause. Oracle evaluates this condition for each row individually, rather than removing all the children of a row that does not satisfy the condition.