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- CREATE INDEX Statement 13059
- CREATE INDEX The CREATE INDEX statement constructs an index on the specified column(s) of the specified table. Examples Create a unique index films_id_idx on the column id of table films : CREATE UNIQUE INDEX films_id_idx ON films (id); Cre
...en with surrounding parentheses, as shown in the syntax. However, the parentheses can be omitted if the expression has the form of a function call. index type Specified index type, see Indexes . Optional. option Index option in the form of a Boolean... - https://man.mtool.work/duckdb/2.0/sql/statements/create_index.html
- Samples 12282
- Samples are used to randomly select a subset of a dataset. Examples Select a sample of exactly 5 rows from tbl using reservoir sampling: SELECT * FROM tbl USING SAMPLE 5; Select a sample of approximately 10% of the table using system sampli
...e seed is a non-negative integer and can be specified in two equivalent ways: With the REPEATABLE keyword after the method form, e.g., USING SAMPLE reservoir(50 ROWS) REPEATABLE (100) . As the second value in the parenthesized method form, e.g., USIN...he entire sample and randomly replace tuples within the materialized sample. The larger the sample size, the higher the performance hit incurred by this process. Reservoir sampling also incurs an additional performance penalty when multi-processing i...i sampling with one crucial difference: every vector is included with a chance equal to the sampling percentage. This is a form of cluster sampling. System sampling is more efficient than bernoulli sampling, as no per-tuple selections have to be perf... - https://man.mtool.work/duckdb/2.0/sql/samples.html
- PostgreSQL Extension Functions 11141
- postgres_clear_cache postgres_configure_pool postgres_execute postgres_hstore_get postgres_hstore_to_json postgres_query read_postgres_binary postgres_clear_cache postgres_clear_cache() -> TABLE Clears cached schema entries (like table name
...connection was available at the time - so no connection was provided by the pool; note that when the parallel scans are performed by the Postgres extension - worker threads always use the try acquire mode; when SET threads = ⟨number_higher_then_pool_...ions which exceed the specified values reaper_thread_period_millis ( UBIGINT ): the period of time when a reaper thread performs the checks health_check_query ( VARCHAR ): the query that is used to check that the connection is healthy Examples List t...name of the attached PostgreSQL database sql_query ( VARCHAR ): query that is passed to PostgreSQL for execution; no transformation or analysis of this query is performed by DuckDB Optional named parameters: use_transaction ( BOOLEAN , default: TRUE... - https://man.mtool.work/duckdb/2.0/core_extensions/postgres/functions.html
- Migrating Python Code to DuckDB 2.0 9984
- This page lists what Python code written for DuckDB 1.x must change to run on DuckDB 2.0. Each item gives the 1.x form, the 2.0 form and the page that explains it. For changes outside the Python client, see Migrating to DuckDB v2.0 . Python
...e file that DuckDB 1.5 wrote opens in DuckDB 1.5. 2.0: DuckDB 1.5 cannot open a file that DuckDB 2.0 writes in its default format; to keep a file readable by DuckDB 1.5, connect with config={"storage_compatibility_version": "v1.5.0"} . See Configurat...ion and Storage Format .... - https://man.mtool.work/duckdb/2.0/clients/python/migration.html
- Catalogs 8827
- The iceberg extension supports attaching Iceberg REST Catalogs. Attaching a catalog is required for writing to Iceberg . Before attaching an Iceberg REST Catalog, you must install the iceberg extension by following the instructions located
...tables_catalog ( TYPE iceberg, ENDPOINT_TYPE s3_tables ); Warning ENDPOINT_TYPE s3_tables always builds an endpoint of the form s3tables.⟨region⟩.amazonaws.com/iceberg . This is incorrect for any region whose endpoint does not use the plain amazonaws...PE iceberg, ENDPOINT_TYPE 'glue' ); Warning As with Amazon S3 Tables , ENDPOINT_TYPE glue always builds an endpoint of the form glue.⟨region⟩.amazonaws.com/iceberg , which is incorrect for regions that do not use the plain amazonaws.com suffix (most...PE 'sigv4' instead of using ENDPOINT_TYPE . The warehouse identifier (the first argument to ATTACH ) accepts the following forms: Warehouse Meaning : The default catalog of the caller's account. ⟨account_id⟩ A 12-digit AWS account ID. ⟨account_id⟩:⟨c... - https://man.mtool.work/duckdb/2.0/core_extensions/iceberg/catalogs.html
- ODBC Extension 8827
- Please note that DuckDB also offers an ODBC client , which allows you to connect to DuckDB via ODBC from other applications. The odbc_scanner extension allows connecting to other databases (using their ODBC drivers ) and run queries with th
...Nightly Version ODBC extension is built using the version-independent DuckDB C API. The same binary (for the specific platform, for example: windows_amd64 ) can be installed and loaded on DuckDB version 1.2.0 or any newer version. Binaries with the...e DuckDB nightly repository, can be installed the following way: INSTALL 'http://nightly-extensions.duckdb.org/v1.2.0/⟨platform⟩/odbc_scanner.duckdb_extension.gz'; The URL with the version 1.2.0 in it should be used even if you are running later vers...ion of DuckDB. Where the ⟨platform⟩ is one of: linux_amd64 linux_arm64 linux_amd64_musl linux_arm64_musl osx_amd64 osx_arm64 windows_amd64 windows_arm64 To u... - https://man.mtool.work/duckdb/2.0/core_extensions/odbc/overview.html
- Information Schema 8827
- The views in the information_schema are SQL-standard views that describe the catalog entries of the database. These views can be filtered to obtain information about a specific column or table. DuckDB's implementation is based on PostgreSQL
...'s information schema . Tables character_sets : Character Sets Column Description Type Example character_set_catalog Currently not i...haracter_repertoire Character repertoire, showing UCS if the encoding is UTF8 , else just the encoding name. VARCHAR 'UCS' form_of_use Character encoding form, same as the database encoding. VARCHAR 'UTF8' default_collate_catalog Name of the database...lt_collate_name Name of the default collation. VARCHAR 'ucs_basic' columns : Columns The view that describes the catalog information for columns is information_schema.columns . It lists the columns present in the database and has the following layout... - https://man.mtool.work/duckdb/2.0/sql/meta/information_schema.html
- Release Cycle 8447
- This document outlines the DuckDB and core extension release cycle framework. It is intended for developers working on DuckDB extensions to better understand the underlying processes. Overview DuckDB follows Semantic Versioning ( v<MAJOR>.<
...xtension with 1 active branch. Since main is always an active branch this is always main. This means all other branches of format vx.y-codename must be vx.<y-n>-codename where n >= 1 Multi branch extension : Extension with more than 1 active branch T...e two core branches that play the main role in the DuckDB (and extensions) release cycle. We will start off by listing the format these core branches come in. main branch: the main branch can mean various things, but can generally be considered the c...ase is intended to ensure the quality of the upcoming release. During this phase additional testing and benchmarking is performed while reducing the risk of introducing last-minute bugs by disallowing feature merges. PRs into DuckDB Bug-fixes for vx.... - https://man.mtool.work/duckdb/2.0/dev/release_cycle.html
- CASE Expression 8447
- The CASE expression performs a switch based on a condition. The basic form is identical to the ternary condition used in many programming languages ( CASE WHEN cond THEN a ELSE b END is equivalent to cond ? a : b ). With a single condition
...e an individual expression after the CASE but before the WHEN . When this is done, the CASE expression is effectively transformed into a switch statement. CREATE OR REPLACE TABLE integers AS SELECT unnest([1, 2, 3]) AS i; SELECT i, CASE i WHEN 1 THEN... - https://man.mtool.work/duckdb/2.0/sql/expressions/case.html
- Dot Commands 8067
- Dot commands are available in the DuckDB CLI client. To use one of these commands, begin the line with a period ( . ) immediately followed by the name of the command you wish to execute. Additional arguments to the command are entered, spac
...commands, use the .help command. List of Dot Commands Command Description .about Prints version, description and license information about DuckDB. .auto_format ⟨on/off⟩ Automatically format SQL before execution. Default: off .bail ⟨on/off⟩ Stop after...shortcuts .highlight ⟨on/off⟩ Toggle syntax highlighting in the shell on / off . See the query syntax highlighting section for more details .highlight_colors ⟨COMPONENT⟩ ⟨COLOR⟩ Configure the color of each query and result component. See the Syntax H..._results ⟨on/off⟩ Toggle highlighting in result tables on / off (duckbox only). See the result syntax highlighting section for more details .history ⟨N⟩ Show the command history with syntax highlighting. If N is given, only the last N entries are sho... - https://man.mtool.work/duckdb/2.0/clients/cli/dot_commands.html
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