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- Create Synthetic Data 13395
- DuckDB lets you quickly generate synthetic datasets by combining a few building blocks: functions and clauses that generate rows , functions that generate values to fill those rows, and extensions that generate whole benchmark datasets. Thi
...s) returns a fixed number of identical rows, which is useful as a scaffold to fill with generated values: FROM repeat_row('placeholder', 0, num_rows = 3); ┌─────────────┬─────────┐ │ column0 │ column1 │ │ varchar │ int32 │ ├─────────────┼─────────┤ │ placeh...older │ 0 │ │ placeholder │ 0 │ │ placeholder │ 0 │ └─────────────┴─────────┘ Cross Products A cross product (Cartesian product) multiplies rows fro... - https://man.mtool.work/duckdb/2.0/guides/snippets/create_synthetic_data.html
- Troubleshooting Quack 9087
- DuckDB 2.0 ships a polished version of Quack (first released in DuckDB 1.5.3) with substantial performance and stability improvements. If you experience any issues with Quack, try upgrading all your DuckDB clients to the latest version of t
...Iceberg catalog attached on the server with the default TABLE_RESOLUTION 'lazy' . Lazily resolved tables are listed with a placeholder column of type UNKNOWN , which the client receives through duckdb_tables() and cannot bind: Catalog Error: Type with name... - https://man.mtool.work/duckdb/2.0/quack/troubleshooting.html
- Run Queries 8833
- Overview DuckDB-Wasm provides functions for querying data. Queries are run sequentially: First, create a connection by calling connect . Then, run queries by calling query to materialize the whole result, or send to fetch result chunks lazi
...ments let you parse a query once and run it repeatedly with different parameter values, binding each value in place of a ? placeholder. Both query() (materialized) and send() (streamed) are available on a prepared statement: // Create a new connection const... - https://man.mtool.work/duckdb/2.0/clients/wasm/query.html
- Building Configuration 8579
- Build Types DuckDB can be built in many different settings, most of these correspond directly to CMake but not all of them. release This build has been stripped of all the assertions and debug symbols and code, optimized for performance. de
...etermine the version and commit hash. If OVERRIDE_GIT_DESCRIBE is not set and Git is not available, DuckDB falls back to a placeholder version and commit hash, and logs a message during the CMake configuration step. The build still succeeds.... - https://man.mtool.work/duckdb/2.0/dev/building/build_configuration.html
- Python DB API 8070
- The standard DuckDB Python API provides a SQL interface compliant with the DB-API 2.0 specification described by PEP 249 similar to the SQLite Python API . Connection To use the module, you must first create a DuckDBPyConnection object that
...with a RETURNING clause. Query Parameters Pass parameter values as the second argument to execute() . Use ? with a list in placeholder order, $1 to reuse a list value or $name with a dictionary. Pass values separately from the SQL text. The query then runs...s are not case sensitive: the key "ABC" binds $abc , so do not pass two keys that differ only in case. Insert a row with ? placeholders, and several rows with executemany() , which runs the statement once for each list of values: con.execute("INSERT INTO it... - https://man.mtool.work/duckdb/2.0/clients/python/dbapi.html
- Instantiate 7815
- Overview DuckDB-Wasm can be instantiated in several ways, depending on how your application bundles and serves its assets. Each approach resolves the mainModule (the WebAssembly file) and the mainWorker (the worker script) for the browser's
...every asset on your own server, which suits offline, air-gapped, or strict content-security-policy deployments. Update the placeholder paths below to match where you serve the files. import * as duckdb from '@duckdb/duckdb-wasm'; const MANUAL_BUNDLES: duckd... - https://man.mtool.work/duckdb/2.0/clients/wasm/instantiation.html
- Iceberg Options 7815
- This page lists the options of the iceberg extension: the parameters accepted by the Iceberg functions , the options of the ATTACH and CREATE SECRET statements used to connect to a catalog , and the global settings. ATTACH Options To make a
...(the default), a table's schema is resolved only when the table is first accessed, and unresolved tables are listed with a placeholder column of type UNKNOWN . With eager , schemas are resolved while tables are enumerated, which adds metadata-loading work a... - https://man.mtool.work/duckdb/2.0/core_extensions/iceberg/iceberg_options.html
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