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- PEG Parser 12497
- New Starting with DuckDB 2.0, the PEG parser is the default parser. In earlier versions it was an experimental, opt-in feature enabled with enable_peg_parser() , which is no longer required or available. DuckDB uses a parser based on PEG (
...parsing expression grammars ). It replaces the parser front end derived from PostgreSQL that earlier versions used. The PEG parser enables better suggestions, improved error messages with precise source l...ew The legacy_parser extension was introduced in DuckDB 2.0. For exceptional cases, DuckDB 2.0 can fall back to the legacy PostgreSQL-style parser through the legacy_parser extension . Setting the following option autoloads the extension and switches...erful syntax, such as INSTALL AND LOAD , is rejected by the legacy parser. Further Reading “A Preview of DuckDB v2.0” blog post “DuckDB v2.0: Your Database Deserves a Better Parser” blog post “Runtime-Extensible SQL Parsers Using PEG” blog post “Runt... - https://man.mtool.work/duckdb/2.0/sql/peg_parser.html
- Friendly SQL 10973
- DuckDB offers several advanced SQL features and syntactic sugar to make SQL queries more concise. We refer to these colloquially as “friendly SQL”. Several of these features were first introduced by DuckDB, while some are inspired by other
...grp; ┌─────────────┐ │ max(val, 3) │ │ int32[] │ ├─────────────┤ │ [3, 2, 1] │ │ [6, 5, 4] │ └─────────────┘ Related Blog Posts “Friendlier SQL with DuckDB” blog post “Even Friendlier SQL with DuckDB” blog post “SQL Gymnastics: Bending SQL into Flex...ible New Shapes” blog post... - https://man.mtool.work/duckdb/2.0/sql/dialect/friendly_sql.html
- Spatial Extension 10668
- The spatial extension provides support for geospatial data processing in DuckDB. For an overview of the extension, see our blog post . Installing and Loading To install the spatial extension, run: INSTALL spatial; Note that the spatial exte
... - https://man.mtool.work/duckdb/2.0/core_extensions/spatial/overview.html
- Querying Parquet Files 10363
- To run a query directly on a Parquet file, use the read_parquet function in the FROM clause of a query. SELECT * FROM read_parquet('input.parquet'); The Parquet file will be processed in parallel. Filters will be automatically pushed down i
...nto the Parquet scan, and only the relevant columns will be read automatically. For more information see the blog post “Querying Parquet with Precision using DuckDB” .... - https://man.mtool.work/duckdb/2.0/guides/file_formats/query_parquet.html
- Graph Queries 10363
- 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
...at finding suspicious patterns in financial data. See the "Uncovering Financial Crime with DuckDB and Graph Queries" blog post for a detailed example of detecting money laundering patterns. Cleanup To remove a property graph: DROP PROPERTY GRAPH soc...Reading DuckPGQ Documentation DuckPGQ Community Extension "Uncovering Financial Crime with DuckDB and Graph Queries" blog post... - https://man.mtool.work/duckdb/2.0/guides/sql_features/graph_queries.html
- Swift Client 10059
- DuckDB has a Swift client. See the announcement post for details. Instantiating DuckDB DuckDB supports both in-memory and persistent databases. To work with an in-memory database, run: let database = try Database(store: .inMemory) To work w
...ts multiple connections per database. Application Example The rest of the page is based on the example of our announcement post , which uses raw data from NASA's Exoplanet Archive loaded directly into DuckDB. Creating an Application-Specific Type We... - https://man.mtool.work/duckdb/2.0/clients/tertiary_clients/swift.html
- Reference 9754
- This page lists the functions, settings, and log types exposed by the quack extension . For a tour of the protocol, start with the Overview . Function Reference Server Management Function Description quack_serve(⟨listen_uri⟩, ...) Start a s
...ocalhost', 'SELECT 1'); SELECT request.type, request.url, response.status FROM duckdb_logs_parsed('HTTP'); type url status POST http://localhost:9494/quack OK_200 POST http://localhost:9494/quack OK_200 Requests are POST s to a /quack endpoint. Persi... - https://man.mtool.work/duckdb/2.0/quack/reference.html
- Python 8839
- The DuckDB Python package has its own repository at duckdb/duckdb-python and uses nanobind 3 to create Python bindings with DuckDB. Prerequisites This guide assumes: You have a full clone of the DuckDB Python package source, including its g
...ecks before letting your commit pass. To run them across the tree, use pre-commit run --all-files . You can also install a post-checkout hook that always runs git submodule update --init --recursive . When you change branches between main and a bugfi...x branch, this makes sure the duckdb submodule is always correctly initialized: pre-commit install --hook-type post-checkout 4. Verify Installation uv run python -c "import duckdb; print(duckdb.sql('SELECT 42').fetchall())" Development Wo... - https://man.mtool.work/duckdb/2.0/dev/building/python.html
- Unity Catalog Extension 8534
- The unity_catalog extension attaches a Unity Catalog catalog, on Databricks or Unity Catalog OSS, as a DuckDB database. You can list, read, insert into and create its Delta Lake tables. It uses the delta extension to access the tables. For
...implementation details, see the “Delta Grows Up: Writes, Unity Catalog and Time Travel” blog post . Note Both extensions are available on a subset of platforms . Installing and Loading The unity_catalog extension will be...Catalog coordinates concurrent writers. For details, see the “Delta Grows Up: Writes, Unity Catalog and Time Travel” blog post . A managed table that DuckDB creates uses catalog-managed commits. Tables created by other clients, e.g., Spark or the Un... - https://man.mtool.work/duckdb/2.0/core_extensions/unity_catalog.html
- Dutch Railway Datasets 8534
- Examples in this documentation often use datasets based on the Dutch Railway datasets . These high-quality datasets are maintained by the team behind the Rijden de Treinen (Are the trains running?) application . This page contains download
...links to our mirrors to the datasets. In 2024, we have published a blog post on the analysis of these datasets . Loading the Datasets You can load the datasets directly as follows: CREATE TABLE servi... - https://man.mtool.work/duckdb/2.0/guides/snippets/dutch_railway_datasets.html
DuckDB 2.0 Documentation / man.mtool.work