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- WITH Clause 12317
- 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.
...ite 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 example later). Take the following directed graph from the LD...BC Graphalytics benchmark : CREATE TABLE edge (node1id INTEGER, node2id INTEGER); INSERT INTO edge VALUES (1, 3), (1, 5), (2, 4), (2, 5), (2, 10), (3, 1), (3, 5), (3, 8...s all paths starting in node 1: WITH RECURSIVE paths(startNode, endNode, path) AS ( SELECT -- Define the path as the first edge of the traversal node1id AS startNode, node2id AS endNode, [node1id, node2id] AS path FROM edge WHERE startNode = 1 UNION... - https://man.mtool.work/duckdb/2.0/sql/query_syntax/with.html
- Graph Queries 10240
- DuckDB supports graph queries via the DuckPGQ community extension , which implements the SQL/PGQ syntax from the SQL:2023 standard. Warning DuckPGQ is a community extension and is still under active development. It may not be available for
...h queries allow you to find patterns and paths in connected data, such as social networks, financial transactions, or knowledge graphs, using a visual, intuitive syntax. Installing DuckPGQ INSTALL duckpgq FROM community; LOAD duckpgq; Starting with D...: SET active_grammar_extensions = ['duckpgq']; Creating a Property Graph A property graph consists of vertices (nodes) and edges (relationships). You create one as a layer on top of existing tables: CREATE TABLE Person (id BIGINT, name VARCHAR); CREA...NTO Knows VALUES (1, 2, '2020-01-01'), (2, 3, '2021-06-15'); CREATE PROPERTY GRAPH social_network VERTEX TABLES ( Person ) EDGE TABLES ( Knows SOURCE KEY (person1_id) REFERENCES Person (id) DESTINATION KEY (person2_id) REFERENCES Person (id) ); Patte... - https://man.mtool.work/duckdb/2.0/guides/sql_features/graph_queries.html
- Writing Tests 7905
- Development and Testing It is crucial that any new features that get added have correct tests that not only test the “happy path”, but also test edge cases and incorrect usage of the feature. In this section, we describe how DuckDB tests ar
... - https://man.mtool.work/duckdb/2.0/dev/sqllogictest/writing_tests.html
- Window Functions 7813
- DuckDB supports window functions , which can use multiple rows to calculate a value for each row. Window functions are blocking operators , i.e., they require their entire input to be buffered, making them one of the most memory-intensive o
...ING) AS we FROM results; This query computes the sum of each point and the points on either side of it: Notice that at the edge of the partition, there are only two values added together. This is because frames are cropped to the edge of the partitio... - https://man.mtool.work/duckdb/2.0/sql/functions/window_functions.html
- Versioning of Extensions 7629
- Extension Versioning Most software has some sort of version number. Version numbers serve a few important goals: Tie a binary to a specific state of the source code Allow determining the expected feature set Allow determining the state of t
...n, but don't necessarily want to switch to using the nightly build of DuckDB itself. This allows using a specific bleeding-edge feature while limiting the exposure to unstable code. To achieve this, Core Extensions tend to regularly push builds to th... - https://man.mtool.work/duckdb/2.0/extensions/versioning_of_extensions.html
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