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- WITH Clause 11228
- The WITH clause allows you to specify common table expressions (CTEs). Regular (non-recursive) common-table-expressions are essentially views that are limited in scope to a particular query. CTEs can reference each other and can be nested.
...er FROM FibonacciNumbers fn; FibonacciNumberIndex FibonacciNumber 0 0 1 1 2 1 3 2 4 3 5 5 6 8 7 13 8 21 9 34 Example: Tree Traversal WITH RECURSIVE can be used to traverse trees. For example, take a hierarchy of tags: CREATE TABLE tag (id INTEGER, name VA...ubclassof = tag_hierarchy.id ) SELECT path FROM tag_hierarchy WHERE source = 'Oasis'; path [Oasis, Rock, Music, Art] Graph Traversal The WITH RECURSIVE clause can be used to express graph traversal on arbitrary graphs. However, if the graph has cycles, th...e query must perform cycle detection to prevent infinite loops. One way to achieve this is to store the path of a traversal in a list and, before extending the path with a new edge, check whether its endpoint has been visited before (see the exam... - https://man.mtool.work/duckdb/2.0/sql/query_syntax/with.html
- JSON Processing Functions 7485
- JSON Extraction Functions There are two extraction functions, which have their respective operators. The operators can only be used if the string is stored as the JSON logical type. These functions support the same two location notations as
...ture. If the element is not an array or object, the element itself is returned. If the optional path argument is supplied, traversal starts from the element at the given path instead of the root element. The resulting table has the following columns: Fiel... - https://man.mtool.work/duckdb/2.0/data/json/json_functions.html
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