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LOAD / INSTALL Statements 13677
INSTALL The INSTALL statement downloads an extension so it can be loaded into a DuckDB session. Examples Install the httpfs extension: INSTALL httpfs; Install the h3 community extension : INSTALL h3 FROM community; Syntax LOAD The LOAD stat ... xtension, autoloading installs and loads it automatically.) Loading an extension also installs and loads any extensions it depends on. For example, loading iceberg also installs the avro extension that it depends on. Examples Load the httpfs extension: ...
https://man.mtool.work/duckdb/2.0/sql/statements/load_and_install.html
Enum Functions 12251
This section describes functions and operators for examining and manipulating ENUM values . The examples assume an enum type created as: CREATE TYPE mood AS ENUM ('sad', 'ok', 'happy', 'anxious'); These functions can take NULL or a specific ... value of the type as argument(s). Most enum functions return a value that depends only on the type of the argument, and not on its value. The functions enum_code() and enum_range_boundary() are exceptions ... ; they return a value that depends on the argument value, as well as its type. Name Description enum_code(enum_value) Returns the (0-based) numeric value bac ...
https://man.mtool.work/duckdb/2.0/sql/functions/enum.html
Gitignore for DuckDB 10127
If you work in a Git repository, you may want to configure your Gitignore to disable tracking files created by DuckDB . These potentially include the DuckDB database, write-ahead log, and temporary files. Sample Gitignore Files In the follo ... temporary files, extend the Gitignore file to include the database file. The exact Gitignore configuration to achieve this depends on the extension you use for your DuckDB databases ( .duckdb , .db , .ddb , etc.). For example, if your DuckDB files use t ...
https://man.mtool.work/duckdb/2.0/operations_manual/footprint_of_duckdb/gitignor...
CREATE SEQUENCE Statement 9778
The CREATE SEQUENCE statement creates a new sequence number generator. Examples Generate an ascending sequence starting from 1: CREATE SEQUENCE serial; Generate sequence from a given start number: CREATE SEQUENCE serial START 101; Generate ... CE id_sequence; Dependency Error: Cannot drop entry "id_sequence" because there are entries that depend on it. table "tbl" depends on sequence "id_sequence". Use DROP...CASCADE to drop all dependents. As the error message suggests, you can force droppin ... CE id_sequence; Dependency Error: Cannot drop entry "id_sequence" because there are entries that depend on it. table "tbl" depends on sequence "id_sequence". Use DROP...CASCADE to drop all dependents. To replace the sequence, first remove the dependency ...
https://man.mtool.work/duckdb/2.0/sql/statements/create_sequence.html
jemalloc 9414
On supported platforms, DuckDB replaces the system's memory allocator with jemalloc . jemalloc is statically linked into DuckDB and cannot be installed or loaded during runtime. For technical reasons, we used to distribute jemalloc as an ex ... ion. Since DuckDB 1.5.3, it is distributed as a third-party library. Operating System Support The availability of jemalloc depends on the operating system. Linux 64-bit Linux distributions of DuckDB ship with jemalloc by default (with the exception of b ...
https://man.mtool.work/duckdb/2.0/internals/jemalloc.html
Versioning of Extensions 9065
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 ... cification for details Release Cycle of Pre-Release and Stable Core Extensions In general for extensions the release cycle depends on their stability level. unstable extensions are often in sync with DuckDB's release cycle, but may also be quietly updat ... dev builds that can be used to try out features before they are officially released. This can be useful when your workflow depends on a new feature, or when you need to confirm that your stack is compatible with the upcoming version. Nightly builds for ...
https://man.mtool.work/duckdb/2.0/extensions/versioning_of_extensions.html
Vectors 8716
Vectors represent a horizontal slice of a column. They hold a number of values of a specific type, similar to an array. Vectors are the core data representation used in DuckDB. Vectors are typically stored within data chunks . The vector an ... be used to check if a string is inlined. Decimals Decimals are stored as integer values internally. The exact native type depends on the width of the decimal type, as shown in the following table: Width NativeType <= 4 int16_t <= 9 int32_t <= 18 int64_ ... vided by the appropriate power-of-ten. Enums Enums are stored as unsigned integer values internally. The exact native type depends on the size of the enum dictionary, as shown in the following table: Dictionary size NativeType <= 255 uint8_t <= 65535 ui ... a pointer of the vector. The data pointer can be used to read or write values from the vector. How to read or write values depends on the type of the vector. Syntax void * duckdb_vector_get_data ( duckdb_vector vector ); Parameters vector : The vector t ...
https://man.mtool.work/duckdb/2.0/clients/c/vector.html
Share a DuckDB Database That Only Stores Views 8716
A DuckDB database file does not have to contain any data: it can store only view definitions that point at remote data such as Parquet files on object storage. The resulting file is only a few hundred kilobytes, yet it behaves like a shared ... rence. Connections over HTTPS and the S3 API are read-only , so the catalog cannot be modified in place. Query performance depends on the network and the layout of the referenced files . The tips for querying remote files apply. ...
https://man.mtool.work/duckdb/2.0/guides/network_cloud_storage/duckdb_views_only...
DROP Statement 8716
The DROP statement removes a catalog entry added previously with the CREATE command. Examples Delete the table with the name tbl : DROP TABLE tbl; Drop the view with the name view1 ; do not throw an error if the view does not exist: DROP VI ... OP SCHEMA myschema; Dependency Error: Cannot drop entry "myschema" because there are entries that depend on it. table "t1" depends on schema "myschema". Use DROP...CASCADE to drop all dependents. The CASCADE modifier drops both myschema and myschema.t1 ...
https://man.mtool.work/duckdb/2.0/sql/statements/drop.html
Release Cycle 8352
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>.< ... f the duckdb submodule and the target version in the MainDistributionPipeline workflow. Which version an extension targets depends on the release cycle phase and the branch. We will now go over all combinations Phase: Mid-cycle Type: Single branch Exten ... x.<y+1>-codename -> DuckDB vx.<y+1>-codename Where to Merge PRs To know where to merge a PR into an unstable API extension depends on two things: the current release phase and the type of extensions. We will now go over all combinations. Phase: Mid-cycl ...
https://man.mtool.work/duckdb/2.0/dev/release_cycle.html
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